Question about 2001 Mercury Sable

17 Answers

Air Bag DTC B1881 Code 47

I have a 2001 Mercury Sable that was recently in a wreck. Now the repairs have been done and it is flashing the air bag code 4 7. I had it scanned, which came up with a DTC of B1881 - Seatbelt Passenger Pretensioner Open Circuit.

I have removed the electrical plugs from under both seats, cleaned them and replaced them. I have also had the code cleared, but it returned immediately.

Any ideas of what I can do to fix this issue?

Posted by on

  • 11 more comments 
  • Chris Hall
    Chris Hall Feb 11, 2009

    Ok. So how do I fix it?

  • Chris Hall
    Chris Hall Feb 11, 2009

    Initially, following the wreck, the vehicle had several airbag codes. However, since the repairs, all of them but this one have cleared.

  • Chris Hall
    Chris Hall Feb 11, 2009

    Again, the circuit is showing as open.

  • Chris Hall
    Chris Hall Feb 11, 2009

    Per my original post..... my code is 47.

  • Chris Hall
    Chris Hall Feb 11, 2009

    Could the problem be anything other than the buckle needing replaced? I don't mind spending the bucks to replace it, so long as I know that its the problem.

    I have tested the circuit and it is reading at over 25ohm (open circuit).

  • Chris Hall
    Chris Hall Feb 11, 2009

    What exactly is the right seat pretensioner? Is this the assembly that pulls out of the moulding or the assembly where the buckle itself is?

  • Chris Hall
    Chris Hall Feb 11, 2009

    I have checked, cleaned and inspected all wires under both seats. The appear healthy and secure.

  • Chris Hall
    Chris Hall Feb 11, 2009

    What sensor?

  • Chris Hall
    Chris Hall Feb 11, 2009

    The wreck was fairly minor and the airbag did not deploy.

  • Chris Hall
    Chris Hall Feb 11, 2009

    Your initial reply states "...the passenger seat belt buckle/pretensioner assembly is more than likely inoperative and needs to be replaced, unless the circuit to it is open..."

    The circuit is showing open. I don't want to go on a random replacing part mission until I get lucky and replace the right unit.

  • Chris Hall
    Chris Hall Feb 11, 2009

    Define tensioner. Are you talking about the assembly that the belt retracts to or the assembly of the buckle itself.

  • Chris Hall
    Chris Hall Feb 11, 2009

    There are no wires running to the belt and retractor?

  • Chris Hall
    Chris Hall Feb 11, 2009

    Chuck was right on track. Thanks for the diagram and the easy to follow explanation.

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17 Answers

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There is probably a broken wire somewhere in the belt or the control panel. You would have to actually trace all the wiring or test all wiring with ohmeter. You should just pull the dash and take out the bulb, or elese take out all fuses for the system

Posted on Feb 11, 2009

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Dear 3mac, Wed 2-11-2009 3:09pm EST (USA)

Seat belt and Air Bag Systems repair is an intricate and complicated process. Trying to do it yourself could cause other seat belt/air bag system problems!

If you insist on doing it yourself, I would recommend researching the procedure carefully before trying anything yourself. I do not recommend doing it yourself!

Living with the error code is unacceptable since it's probably fired the seat belt tension-er charge due to your accident even though the air bag did not deploy. This means your SEAT BELT WILL NOT TIGHTEN IN ANOTHER ACCIDENT!

Please get this fixed by a reputable repair service ASAP!

jack
Air Bag DTC B1881 Code 47 - 30a89bf.jpg

Posted on Feb 11, 2009

  • Jack Iaria
    Jack Iaria Feb 11, 2009

    If you believe the codes were not reset to factory standards then I would go to a auto part store to have them check it, diagnose it, and reset it if recommended!

    I use Advance Auto Parts since they will usually do this for free!

    jack

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  • Master
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The repairman forgot to reset the airbag sensor unit to factory specs.

Posted on Feb 11, 2009

  • Michael Masters
    Michael Masters Feb 11, 2009

    Its the airbag sensors. when the airbag was repacked by the repairman, they forgot to reset the sensor module.

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You will need to replace the complete retractor and belt.

Posted on Feb 11, 2009

  • Randy Hough
    Randy Hough Feb 11, 2009



    1. seat adjustment limit switch


    2. air bag deployment inhibitor circuit


    3. crash sensor


    4. seat belt buckle switch


    5. Crash sensor relay

    Check the above items


    A holding circuit through the seat switch maintains the relay switch open. Thus, the seat belt must be buckled after sitting down in order to provide the pulse of current to initially close the relay switch and to provide the continuing current to keep the relay closed

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  • 229 Answers

One of the sensors that signals the airbag to deploy has to be either replaced or reset. It has narrowed it down for you and has told you that your issue is on the passenger side of the vehicle. I believe that it is connected to your seat belt assembly as many safety systems are set up to work in balance with the seat belts. Passenger Pretensioner Open Circuit tells me that the sensor is still triggered. This is a serious issue because of the fact that if the sensor is triggered to a certain degree then it is very possible that hard braking, going over speed-bumps or even hitting a pothole could completely engage the system and fire off one of the airbags. I have a phone call made to a friend of mine that is a great Ford repair mechanic and I will include his comments in this message in the next few minutes. Thanks

Posted on Feb 11, 2009

  • Lance  McKinney
    Lance McKinney Feb 11, 2009

    I spoke to the mechanic I know and he said that there is sensor in the Retractor Assembly in the seat belt assembly that has been triggered open and needs to be replaced. He also said that before tearing it down to get to it that he suggests you find a schematic online to locate exactly where the pretensioner assembly circuit is. It can be in two places according to him. In the retractor assembly or in the base of the shoulder harness assembly. He said that there will be evidence of the assembly where a wiring harness is found leading into the retractor or the base assembly. That is where it is found and should be replaced. As soon as the open circuit is closed with the replacement part the reset will take and it is permanently repaired.

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Get it checked at the local diagnosis center for very negligible fee/cost.and get it replaced.as its necessary to replace the unit to make it work.but just get it confirmed before replacing it.

Posted on Feb 11, 2009

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Welcome to Fixya! This is a Common Error Code that Shows whenever there is an Accident. You will need to Replace the ENTIRE Tensioner Assembly on that Side. Anytime the Tensioner Has to do it's Job, on the Newer Vehicles, after an Accident it will need to be Replaced to Get the Airbags working again. Please Rate My Response! Thanks!

Posted on Feb 11, 2009

  • Travis Humphries
    Travis Humphries Feb 11, 2009

    Yes, The Assembly that the Belt Retracts to down on the Floor on Each side of the Front Seats.

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Replace the sensor. That is what I had to do on my Ford. Even though I was not in a accident nothing I tried worked until I replaced the pretensioner circuit

Posted on Feb 11, 2009

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Check the yellow wire under the front seats one of them must be lose.also check out other connecting wires as any of those wires must be definately loose as this error code coming up.

Posted on Feb 11, 2009

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Hello, You probably have to replace the right seat pretensioner.
If you find this information to be correct would you please enter a "fixya" rating.
Thanks, Gator241

Posted on Feb 11, 2009

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The restraints control module (RCM) monitors the resistance of the circuit to the passenger safety belt pretensioner. If the RCM detects a resistance that is out of the range on the passenger safety belt pretensioner circuits, it will store diagnostic trouble code(DTC) B1881 or B1886 in memory and flash, depending on the fault indicator, and lamp fault code (LFC) 47 depending on the fault (or higher priority code if one exists) on the air bag indicator.

Fault Conditions

The RCM monitors for the following fault conditions:

low resistance.
high resistance.
circuit open.
Possible Causes

A safety belt pretensioner fault can be caused by:

damaged wiring, terminals or connectors.
a faulted pretensioner.
a faulted RCM.

In plain English, the passenger seat belt buckle/pretensioner assembly is more than likely inoperative and needs to be replaced, unless the circuit to it is open. Hope this helps.

Posted on Feb 11, 2009

  • Cary Crook Feb 11, 2009

    Sorry one other thing the best way to fix this is replace both sides ( drivers side too) code or not, it is necessary and you should be cleared up. Thank You

  • Cary Crook Feb 11, 2009

    You will also need to replace the driverside pretensioner, it only explains this in the factory book. Thanks againHave a good day

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  • Mercury Master
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This code basically tells you that the passenger side seat belt pretensioner deployed. It is made into the seat belt buckle and what it does is when it deployes it pulls the seat belt tighter.When you had your accident there must have been a passenger in the seat with their belt buckled am I correct?
To verify this unhook the connector to the buckle and measure the reistance it is probably showing open ckt. the go to drivers side and unhook the connector there and measure resistance and you will probably se around 2.5 to 3 ohms. You will have to replace the buckle to correct it.

Posted on Feb 11, 2009

  • 5 more comments 
  • Chuck Martin
    Chuck Martin Feb 11, 2009

    Here are your part numbers for the part depending on color

    Black 2F1Z-5461202-AAC

    Parchment 2F1Z-5461202-AAA

    Graphite

  • Chuck Martin
    Chuck Martin Feb 11, 2009

    Graphite 2F1A-5461202-AAB

    The list price is $98.02

  • Chuck Martin
    Chuck Martin Feb 11, 2009

    That first part of the last number should have been 2F1Z and not A

  • Chuck Martin
    Chuck Martin Feb 11, 2009

    Yeah it is part of the seat belt buckle itself you will see what I can best describe as an accordian sleeve from it to the buckle the at the bottom of the assembly you will see what looks like a gas cylinder potruding from the side.

    Remove the safety belt buckle and pretensioner .


    1. Remove the nut.


    1. Remove the safety belt buckle and pretensioner.

    http://i253.photobucket.com/albums/hh43/...

  • Chuck Martin
    Chuck Martin Feb 11, 2009

    If the ckt is showing open then it is bad,that is what is setting the code.

  • Chuck Martin
    Chuck Martin Feb 11, 2009

    One more thing look at my pic you have to pull the seat cover back and take off the nut then it comes out.If you have to remove the seat to do this then you will need to get the OCS(occupant classification sensor) in the passenger seat recalibrated.The dealer can do this thru the IDS.

  • Chuck Martin
    Chuck Martin Feb 11, 2009

    Disreguard my last post your vehicle is not equipped with an OCS sensor in the passenger seat.So you don't have to have it calibrated.

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Turn the ignition key to run position. The AIRBAG light will come on for a few seconds and then start the flashing sequence. Count the number of flashes. The light will flash a 2 digit number (eg. 12, or 23, or...). So a code 23, for example, will flash twice pause for a couple of seconds and then flash three times... pause for a couple seconds and repeat that sequence all over again.

Posted on Feb 11, 2009

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Ive learned to live with mine.i went to a dealer with mine and they couldnt do anything about it so ive had to learn to live with it

Posted on Feb 11, 2009

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Hi
Code relates to low voltage detected in a capacitor inside the airbag module......

Posted on Feb 11, 2009

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The restraints control module (RCM) monitors the resistance of the circuit to the passenger safety belt pretensioner. If the RCM detects a resistance that is out of the range on the passenger safety belt pretensioner circuits, it will store diagnostic trouble code (DTC) B1881 or B1886 in memory and flash, depending on the fault indicator, and lamp fault code (LFC) 47 depending on the fault (or higher priority code if one exists) on the air bag indicator.
Fault Conditions

The RCM monitors for the following fault conditions:

low resistance. 
high resistance. 
circuit open.
Possible Causes

A safety belt pretensioner fault can be caused by:

damaged wiring, terminals or connectors. 
a faulted pretensioner. 
a faulted RCM.

In plain English, the passenger seat belt buckle/pretensioner assembly is more than likely inoperative and needs to be replaced, unless the circuit to it is open. Hope this helps.
thanks for using fixya

Posted on Feb 11, 2009

  • 1 more comment 
  • rockfixya
    rockfixya Feb 11, 2009

    you can also try to Turn off the ignition, open the connector, clean the pins and reassemble. Applying dielectric grease to the pins should make the repair last longer.
    Good Luck
    do not forget to rate the solution...

  • rockfixya
    rockfixya Feb 11, 2009

    Turn off the ignition, open the connector, clean the pins and reassemble. Applying dielectric grease to the pins should make the repair last longer.



  • rockfixya
    rockfixya Feb 11, 2009

    Turn off the ignition, open the connector, clean the pins and reassemble. Applying dielectric grease to the pins should make the repair last longer.



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  • Mercury Master
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When the airbags are deployed in an accident it burns out the airbag module, also known as the airbag diagnostic monitor, this must be replaced, the code u have indicates this is the problem. I am a Ford dealer tech and have seen this before.

Posted on Feb 11, 2009

  • yadayada
    yadayada Feb 11, 2009

    when the monitor burns out it melts a small wire fusible link inside the monitor on the circuit board, so yes the code is for an open circuit.

  • yadayada
    yadayada Feb 11, 2009

    Here is your answer, did u replace the R front explosive seat belt tensioner?

    Code 47 is for the r/f seat belt buckle--the seat belt buckle has a explosive in it that pulls the buckle down to tighten up the seat belt when you get into an accident--take a look under the r/f seat and take a look at the wire to the r/f seat belt buckle ,,just in case they are broken or unpluged -the wires are YELLOW / BLACK and YELLOW / RED ---there is also a TSB out for this that the conector under the seat has high resistance and they wont you to clean the conector ,

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B2293

Pinpoint Test H: LFC 19 and 21/DTC B2293 - Restraint System Airbag Status
Normal Operation
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MY AIR BAG LIGHT IS STAYING ON AND SOMETIMES IT FLASHES?


You need to find out what the fault code is. It will direct you to the area responsible.

Air Bag Diagnostic Monitor
ani_caut.gif WARNING: UNDER NO CIRCUMSTANCES SUBSTITUTE ANOTHER FUSE VALUE FOR THE 10A BATTERY FUSE. ANY FUSE OTHER THAN 10A MAY CAUSE DISARMING FAILURE AND MAY RESULT IN DANGER TO THE OCCUPANTS OF THE VEHICLE. DO NOT ATTEMPT TO REPLACE THE 10A BATTERY FUSE UNTIL THE AIR BAG SYSTEM FIRST HAS BEEN DEACTIVATED (SEE DEACTIVATION PROCEDURE FOR DETAILS).
NOTE: The safing sensor is internal to the air bag diagnostic monitor (14B056) and is not replaced separately.
The air bag diagnostic monitor continually monitors all supplemental air bag restraint system (SRS) components and wiring connections for possible faults in the system. If the air bag diagnostic monitor detects a fault in the SRS when the ignition switch (11572) is in the RUN position, a diagnostic trouble code (DTC) will be displayed by the air bag indicator, located on the instrument cluster (10849).
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The air bag diagnostic monitor illuminates the air bag indicator for approximately six seconds when the ignition switch is in the RUN position and then turns the indicator off. This shows that the air bag indicator is operational. If the air bag indicator does not illuminate or the indicator stays on or flashes at any time, a fault has been detected by the air bag diagnostic monitor.
DTCs may not be displayed for approximately 30 seconds after the ignition switch is placed in the RUN position. This is the amount of time the air bag diagnostic monitor requires to perform all tests and verify system faults.
Each DTC (a series of flashes and pauses of the air bag indicator):
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--------------------------------------------
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4 Answers

Airbag light has started flashing then came on this is the first time we have had an issue with this. after flashing the light stays on.


get the code, but my guess is it\'s the seat belt pre-tensioner connectors. There is a TSB to replace them on both seats at the same time. Not a recall so not covered under warranty. Please rate highly if this helps.
TSB 05-17-11
RESTRAINT SYSTEM - SAFETY BELT BUCKLE AND PRETENSIONER DIAGNOSTIC TROUBLE CODE (DTC) B1877 AND/OR B1881
FORD:
2001-2004 Escape

This article supersedes TSB 04-24-4 to update the service procedure.
ISSUE:
Some 2001-2004 Escape vehicles may exhibit an intermittent air bag lamp on and diagnostic trouble code (DTC) B1877 and/or B1881. This may be caused by a variation in the electrical continuity between the pins of the driver and/or passenger side wiring harness and the buckle pretensioner connector. If this condition were to occur, the air bag system remains fully functional.

ACTION:
Install a replacement harness connector kit ON BOTH the driver and passenger safety belt buckle pretensioners, even if the DTC is present for only one side. The kit includes improved connector halves to replace the existing connectors on both the body harness and the safety belt buckle pretensioner.
One kit is required per side (2 kits per vehicle). Refer to the instruction sheet included in the kit for complete repair procedure.


OPERATION

DESCRIPTION

TIME


051711A
2001-2004 Escape Install A Replacement Harness Connector On Both The Body Side And Safety Belt Buckle Pretensioner Harness For Both Driver And Passenger Safety Belt Buckle Pretensioners (Do Not Use With 14056D)
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1 Answer

Airbag light on. flashing 5 times 2 times then stays on


I think you have a false code stored due to your work. clear the code and you should be ok.
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  • Is always displayed at least twice.
If the diagnostic monitor detects a fault in the air bag system, a diagnostic trouble code (DTC) will be written to the diagnostic monitor's Non-Volatile RAM (NVRAM). This DTC will then cause the lamp to flash a lamp fault code (LFC) on the air bag warning lamp and can be retrieved with the New Generation STAR (NGS) tester. After servicing the DTC may then be cleared from the NVRAM.
If a system fault is present and the air bag indicator is malfunctioning, an audible tone will be heard. The tone is a series of five sets of five beeps. If the tone is heard, the air bag system needs attention.
If a fault exists that makes unwanted air bag deployment possible, the air bag diagnostic monitor will attempt to remove deployment power by turning on a solid state switch to blow the 10A battery fuse.

If the 10A battery fuse has successfully been blown by the air bag diagnostic monitor, the air bag diagnostic monitor will not attempt to blow it again until the proper fault has been repaired and cleared (refer to Diagnostic Instructions). The air bag diagnostic monitor will store both the unwanted deployment diagnostic trouble code and the loss of deployment power diagnostic trouble code. The loss of deployment power diagnostic trouble code is the highest priority.
If a fault exists that makes unwanted air bag deployment possible, the air bag diagnostic monitor has an internal fuse that that will blow (open) automatically. This removes all power to the air bag deployment circuit.
DTCs are prioritized numerically. If two or more faults occur at the same time, the fault having the highest priority will be displayed first. After that fault has been corrected, the next highest priority fault will be displayed.
The air bag diagnostic monitor includes an internal backup power supply. This feature provides sufficient backup power to deploy the air bag in the event the battery (10655) or battery cables are damaged in a collision before safing and air bag sensors close. The backup power supply will deplete its stored energy approximately one minute after the positive battery cable is disconnected.
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Once a DTC is logged into the air bag diagnostic monitor memory, it will stay in memory until 80 key cycles have been recorded or until the NGS is used to erase the DTCs. Once 256 key cycles have been recorded since the concern was last detected, the DTC will automatically be removed from memory.
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Active Command Modes
This command allows the technician to verify operation of the air bag system, indicator and tone. When the air bag output command is executed, the indicator and the tone are simultaneously activated for approximately four seconds. Both devices are automatically deactivated.


Air Bag Diagnostic Monitor DTC Priority Table DTC LFC Description Action To Take B1342 24 Air bag diagnostic monitor is faulted (retrieved only during On-Demand Self Test) GO to Pinpoint Test P . B1867 12/52 Lost or low battery voltage GO to Pinpoint Test A . B1869 — No air bag indicator — inoperative indicator circuit GO to Pinpoint Test R . B1913 13/53 Air bag circuit shorted to ground — driver/passenger GO to Pinpoint Test B . B1914 14/54 Air bag sensor circuit shorted to ground GO to Pinpoint Test C . B1921 21 Air bag diagnostic monitor ground circuit open or not mounted to the vehicle properly GO to Pinpoint Test D . B1922 22 Safing sensor output circuit shorted to battery voltage GO to Pinpoint Test E . B1924 24 System disarm fault GO to Pinpoint Test P . B1932 32 Driver side air bag module circuit high resistance or open GO to Pinpoint Test F . B1933 33 Passenger side air bag module circuit high resistance or open GO to Pinpoint Test G . B1934 34 Driver side air bag module circuit low resistance or shorted GO to Pinpoint Test H . B1935 35 Passenger side air bag module circuit low resistance or shorted GO to Pinpoint Test J . B1941 41 RH air bag sensor feed/return circuit open GO to Pinpoint Test K . B1942 42 LH air bag sensor feed/return circuit open GO to Pinpoint Test L . B1944 44 RH air bag sensor not mounted to the vehicle properly or ground circuit open GO to Pinpoint Test M . B1945 45 LH air bag sensor not mounted to the vehicle properly or ground circuit open GO to Pinpoint Test N .
DTC - Diagnostic Trouble Code, retrieved using New Generation STAR (NGS) Tester.
LFC - Lamp Fault Code, flashed on air bag indicator.

May 21, 2009 | 1997 Ford F150 Regular Cab

1 Answer

Air bag sensor keeps flashing


If a concern is detected, the air bag control module will communicate by flashing the warning indicator. A diagnostic trouble code (DTC) is logged by the air bag control module in a nonvolatile memory. For additional information, refer to Diagnosis and Testing in this section.
Lamp Fault Codes (LFC)
Item Part Number Description 1 One flash cycle: Driver air bag trouble code 2 Two flash cycle: Passenger air bag trouble code 3 Three flash cycle: Trouble code common to both driver and passenger air bag circuit 4 Four flash cycle: Safety belt pretensioner trouble code common to both driver and passenger pretensioner circuits 5 Five flash cycle: Driver side air bag trouble code 6 Six flash cycle: Passenger side air bag trouble code 7 Not used 8 Not used

Apr 10, 2009 | 2001 Ford Focus

1 Answer

Instrument Panel Codes??


Yes, it's called a lamp fault code.

9 is not familiar to me. Call dealer service department and ask them what code means.

Here are codes for a 94 Aerostar. I don't have 91 Sable. Sorry.



Air Bag Diagnostic Monitor Diagnostic Trouble Code Priority Table Diagnostic Trouble Code Component/Fault Description — No Air Bag Indicator — Inoperative Indicator Circuit or No Battery Positive Voltage to Air Bag Diagnostic Monitor — Continuous Air Bag Indicator — Air Bag Diagnostic Monitor Disconnected or Inoperative 12 Low Battery Voltage 13 Air Bag Module or RH Cowl Side Panel Air Bag Sensor Circuit Shorted to Ground 21 LH Cowl Side Panel Air Bag Sensor Not Mounted to Vehicle Properly 22 LH Cowl Side Panel Air Bag Sensor Circuit Shorted to Battery Voltage 23 LH Cowl Side Panel Air Bag Sensor Circuit Input Feed/Return Circuit Open 24 LH Cowl Side Panel Air Bag Sensor Diagnostic Circuit Open or Low Resistance in Center Air Bag or Front Air Bag 32 Driver Side Air Bag Circuit High Resistance or Open 33 Passenger Side Air Bag Circuit High Resistance or Open 34 Driver Side Air Bag Circuit Low Resistance or Shorted 35 Passenger Side Air Bag Circuit Low Resistance or Shorted 41 Center Radiator and RH Cowl Side Panel Air Bag Sensor Circuits High Resistance or Open 44 RH Cowl Side Panel Air Bag Sensor Not Mounted to Vehicle Properly 45 Center Air Bag Sensor Not Mounted to Vehicle Properly 46 Open Splice Center Air Bag Sensor Ground Monitor 51 Air Bag Diagnostic Monitor Internal Thermal Fuse Blown and Short to Ground No Longer Exists 52 Backup Power Supply Voltage Boost Fault 53 Sensor Circuits Resistance to Ground or Internal Air Bag Diagnostic Monitor Fault — Rapid Continuous Flashing of Air Bag Indicator

Feb 25, 2009 | 1992 Mercury Sable

1 Answer

Airbag flashes 10 times misses a flash then repeats


Try clearing the codes & see if it returns. I do not see a code fault 10. Starts at 12.

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Section 01-20B: Restraints, Passive — Supplemental Air Bag System 1995 Town Car, Crown Victoria, Grand Marquis Workshop Manual DIAGNOSIS AND TESTING Diagnostic Trouble Code Clearing Procedure to Clear Diagnostic Trouble Codes from Diagnostic Monitor Non-Volatile Random Access Memory.
Normal Operation
The air bag diagnostic monitor (14B056) continually checks the air bag system for readiness. When a fault condition is detected, the DTC associated with that fault is stored in the air bag diagnostic monitor's Non-Volatile Random Access Memory (NVRAM). After writing the DTC to NVRAM, the air bag diagnostic monitor signals the fault by flashing the appropriate diagnostic trouble code on the air bag indicator. The diagnostic trouble code written to NVRAM is permanently stored in the air bag diagnostic monitor until cleared by the diagnostic trouble code clearing procedure.
  • Upon each cycle of the ignition switch (11572) , the air bag diagnostic monitor checks for diagnostic trouble codes written in NVRAM. If any diagnostic trouble codes exist in NVRAM, the air bag diagnostic monitor will then check to see if these fault conditions are still present.
  • If the conditions of the diagnostic trouble code in NVRAM are still present, then the air bag diagnostic monitor will use the air bag indicator to flash out the diagnostic trouble code number that was written in memory.
  • If the conditions of the diagnostic trouble code are not still present (indicating an intermittent or serviced fault), the air bag diagnostic monitor will use the air bag indicator to flash out a DTC which is the sum of the diagnostic trouble code in NVRAM plus 40.
Example: Due to corrosion, high resistance develops on the driver side air bag circuit. The air bag diagnostic monitor stores a diagnostic trouble code 32 in NVRAM. Upon each cycle of the ignition switch , the air bag diagnostic monitor checks the resistance of the driver air bag circuit.
  • If the resistance is still high, the air bag diagnostic monitor causes the air bag indicator to flash out a DTC 32.
  • If the resistance falls within the normal range due to service or an intermittent condition, the air bag diagnostic monitor causes DTC 72 to be flashed on the air bag indicator.
Once a fault has been serviced, the associated diagnostic trouble code may be cleared from NVRAM. Only diagnostic trouble codes that the air bag diagnostic monitor sees as repaired or intermittent may be cleared (diagnostic trouble codes 52 and above). In no circumstances can hard fault conditions (diagnostic trouble codes 45 and below) be cleared.
  1. Follow the diagnostic procedures as outlined to service the fault condition flashing on the air bag indicator.
  1. Cycle the ignition switch to OFF and then to RUN.
  1. Observe air bag indicator prove-out (six ± two seconds) followed by diagnostic trouble code (52-85) flashing completely one time.
  1. Locate the Diagnostic "Trouble Code Clear" Connector located underneath the glove compartment (06010) containing Circuits 631 (T/R) and 57 (BK).
  1. Use a jumper wire to short Circuit 631 (T/R) to Circuit 57 (BK) or to another good ground. This short must be made after the diagnostic trouble code flashes completely one time, but before the warning light stays on continuously.
  1. Hold short until air bag diagnostic monitor tone sounds (approximately five seconds).
  1. Release short on Circuit 631 (TAN/RED STRIPE) to Circuit 57 (BLACK). This short must be released within 25 seconds after the diagnostic monitor tone sounds. Diagnostic trouble code is now cleared from NVRAM. Next highest priority diagnostic trouble code stored in NVRAM (if one exists) will begin flashing.

Feb 09, 2009 | 1995 Lincoln Town Car

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