Question about 2004 Oldsmobile Bravada

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Rear access door ajar - false signal

DIC indicates that the rear lift gate is open. It is not. DIC error message followed an audible click that I was able to hear when I was in the drivers seat. The courtesy lights are staying "on" as a result of the computer thinking that the rear gate is open, but it is physically closed. Are there ordinary switches that indicate open/close and where are they located? Thank you.

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Posted on Jan 02, 2017

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SOURCE: Door Ajar Warning Light Stays On

Our Ford Expedition & an Olds Silhouette Premier & both did the same thing. Someone online said to spray the inside door where the metal connects with the frame & sensors are there with WD-40. We did & it fixed the problem. Maybe this will work for yours.

Posted on Aug 25, 2008

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I have 2005 chevy tahoe my doors all licks but my liftgate door with window stays open use to lock w all my doors? I havent check anytjing yet? I cant lock it.


Here is how it works !
Liftgate Locking Operation
The lift gate will lock any time the vehicle is shifted out of park on vehicles equipped with an automatic transmission and at vehicle speeds exceeding 5 kph with manual transmission. This happens in conjunction with auto door locks if enabled or independently of auto door locks if the feature is disabled. This ensures that the lift gate is locked anytime the vehicle is shifted out of park or when the vehicle is in motion.
The lift gate lock relay supply and coil sides receive a constant voltage through the battery voltage supply circuit and the ECC fuse. The normally closed contact is connected to ground and the control side is connected to the body control module (BCM). A lock function will occur when a door lock switch activation, keyless entry lock transmission, auto door lock function or a lift gate lock function has been received by the BCM. The BCM will then ground the control side of the lift gate lock relay. This energizes the relay and allows voltage to be applied to the lift gate lock actuator lock control circuit. Since the other side of the lift gate lock actuator is connected to the normally closed contacts of the door unlock relay to ground, the lift gate will lock. When an unlock function occurs the BCM will ground the control side of the unlock relay and the rear doors and lift gate will unlock.
The BCM also runs diagnostics on the lift gate lock relay control circuit and will set DTC B3825 as current and also send a Class 2 message to the DIC. The DIC will display REPLACE LIFTGATE FUSE to inform the driver that a fault has been detected in the lift gate lock circuit and that the lift gate is not locked. Faults that will set the DTC and cause the DIC to display the message could be any of the following:
?€¢
An open ECC fuse


?€¢
An open or short to ground in the lift gate lock relay battery positive voltage circuit


?€¢
A faulty lift gate lock relay


?€¢
An open or short to ground in the lift gate lock relay control circuit


?€¢
A short to ground in the lift gate lock actuator lock control circuit


?€¢
A faulty BCM

May 14, 2016 | Cars & Trucks

1 Answer

Why do I see a rear access open and a gate ajar warning on insument panel, even though it is locked?


[SOLVED] False Gate Ajar/Rear Access Open warnings: follow up post ...

forums.trailvoy.com > ... > 02-09 General Tech Q&A > General

Dec 28, 2009 - 4 posts - ‎2 authors
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Rear access door ajar - false signal - Fixya

www.fixya.com/cars/t22610885-rear_access_door_ajar_false_signal

Feb 03, 2016 | 2002 Oldsmobile Bravada

1 Answer

Rear hatch keeps opens while driving...


Unless you have electrical diagnostic skills , I suggest you take this to the dealer ! The lift gate can be opened by operating the switch on the instrument panel. Battery voltage is supplied to the liftgate actuator through the body control module (BCM). The BCM will pulse the lift gate actuator when a release input is received through the key fob, or the instrument panel switch.
The body control module (BCM) receives an input from the liftgate ajar assembly. The ajar assembly is normally open when the liftgate is fully closed. When the liftgate is opened, the ajar assembly contacts close providing a path to ground. The driver information center (DIC) illuminates the rear access open message when the gate is open. The instrument panel cluster (IPC) receives a serial data message from the BCM indicating the liftgate ajar status. If this message is displayed and the vehicle speed is greater than 8 km/h (5 mph), a chime will sound.
It could be ajar switch is bad .

Dec 16, 2015 | 2012 Chevrolet Equinox LS 4dr SUV 2.4L...

1 Answer

Where is my door chime located impala 2002


It comes through the radio an left front speaker .
The audible warnings alert the driver of a system concern or a critical vehicle condition. The radio generates the audible warnings through the left front speaker. The radio receives audible warning requests via the class 2 serial data line. If the radio receives multiple audible warning requests, the warning with the highest priority sounds first. The Multifunction Alarm generates the audible warnings on vehicles with RPO UL5 -- Radio Delete Option. The following lists the audible warning priority and the pulse rate:
The radio activates the door ajar audible warning as requested by the body control module (BCM). The BCM sends a class 2 message to the radio indicating the chime frequency of a medium rate and at a continuous duration. The door ajar warning sounds and the door ajar indicator illuminates when the following occurs:
  1. The body control module (BCM) determines that the driver's door is open and the signal circuit low. The IPC receives a message via class 2 from the BCM requesting illumination of the door ajar indicator.
  2. The vehicle is not in park. The BCM receives a class 2 message from the PCM indicating the gear position.
Class 2 Serial Data Link
The class 2 serial data link allows the following modules to communicate and share data with each other:
?€¢
Auxiliary Power Drop Connector


?€¢
Body Control Module (BCM)


?€¢
Driver Information Center (DIC)


?€¢
Electronic Brake Control Module (EBCM)


?€¢
Instrument Panel Cluster (IPC)


?€¢
Powertrain Control Module (PCM)


?€¢
Radio


?€¢
Remote Playback Device-CD Player (if equipped with UQ3)


?€¢
Inflatable Restraint Sensing and Diagnostic Module (SDM)


?€¢
Vehicle Interface Unit (VIU) (if equipped)

The class 2 serial data link allows a scan tool to communicate with the above modules for diagnostic and testing purposes.

Nov 16, 2015 | Cars & Trucks

1 Answer

2008 explorer door locks not locking from door switches


This is not a good thing. Ford uses a computer called the GEM and that means General Electronics Module. It controls:
  • Low Coolant Indicator On Cluster
  • Brake Indicator on Cluster
  • DRL - Control
  • Wipers
  • AutoLamps
  • Rear Defrost
  • Interior Lamps(dome)
  • High Beam Indicator only (cluster)
  • Low Coolant indicator
  • Key-in Buzzer
  • Seatbelt indicator only (Cluster)
  • Trunk Pop Relay
  • Power Locks
  • Door Ajar Sensors
  • Door Keyless entry pad
  • Remote Keyless Entry
  • One Touch Down (power window)
  • Air Bag Tone
  • Anti Theft (perimeter Alarm) (SEL, or SE(s) with mods)
  • Lift gate ajar (wagon)
  • Liftgate Pop
  • Accessory Delay signal (accessory that work after engine off, prior to door ajar)
  • Battery Saver Relay signal (accessory that work after engine off, 15 mins) Map lights, vanity mirrors

They are located behind the radio in the dash and they are $$$ about 600 USD.

Jan 27, 2014 | 2008 Ford Explorer

1 Answer

The alarm goes off by itself..I am no where near the key


very old post... choices?? i will try to help others fix ALARMS.
Jeep WK. 2005 to 2010
what id do? , is never set it. or defeat it. (ask)( the oper,guide tells this)

but if it MUST work than it must be fixed.
the dealer would use a scan tool , see no errors and replace something exensive, then it fails again. the endless story of alarms.
in your case he'd install the TSB fix first.
He'd use a DRBIII scan tool to find the offending input.
The BCM (body puter ) gets the sensor inputs belowL

The BCM receives the ajar switch signals on the following circuits.
  • Circuit G75 provides left front door ajar switch signal
  • Circuit G74 provides right front door ajar switch signal
  • Circuit G77 provides left rear door ajar switch signal
  • Circuit G76 provides right rear door ajar switch signal
  • Circuit G78 provides liftgate ajar and liftglass ajar signals.
the hardest problems are always intermittants.
Intermittent alarms and stalling engines, tops list.
finding it? , with out sleeping in the car is a big problem.

also there is TSB on this.
Swing gate open alarm.
http://www.jeepforum.com/forum/f67/2008-wk-liftgate-open-message-746268/#post13865598

the hard part, is finding out which inputs is (was) failing.
in my car i can find it with a scan tool .
newer cars store the failed input in the PCM memory. as a DTC.

In my shop I have a CAN-BUSS monitoring tool that allows me
to see live AJAR messages and logs them to the laptop, HDD.
for later analysis. (ok the lift gate failed at 3am, bingo)
my 2008 logs, DTCS like this.
B1820-HOOD AJAR INPUT CIRCUIT HIGH (and all others)
i have a scan tool that can see that , called a innova 3160
a $200 tool,
I have 2 ways to find intermittent in my newer jeep

2006; WK?
FSM quotes with comments.
VTSS VERIFICATION TEST - 1A Diagnostic Test
1. Perform VTSS Verification Test
  • Open the driver door and roll down the window.
  • Remove the ignition key (but keep in hand).
  • Lock the doors with RKE transmitter or power door lock switch.
  • Ensure all doors, tailgate, and tailgate flip-up glass are closed.
  • If the VTSS Indicator Lamp flashes rapidly and after approximately 16 seconds changes to a slower flash, the system is operational. However, If the indicator fails to flash as described, there is a problem with the system.
  • comment: gee, attempt to rattle all doors, and see if VTSS sees a failure. all doors, lift gate and hood, (if car has hood switch)
the FSM shows the B1xx and B2xxx codes for alarms.
only a scan tool can do that. mine can,
you can also rent cheap CAN-BUS scan tools, from most good
autostores.
that should cover most alarming issues.
but here is one better for older jeeps.
see matrix table for coverage by body type.
http://autorepair.about.com/library/a/1h/bl903h.htm





Aug 13, 2013 | 2006 Jeep Grand Cherokee

1 Answer

Frequently the door ajar alarm will not turn off even after you close the door .


{: ) Some models use the front doors only, others use all doors for any ajar signals, and may even indicate a message on the DIC that a door is ajar or open. You can try to slam the doors one by one to get that real tight closed door and you may manually make the adjustments.
However if there are wiring or components issue, it can take you long time to search and diagnose. Using a scan tool is the fastest way to locate the main cause.
The three most possible and common cause are the doorlatches, improper adjustments, and shorted signals on the wirings.

Jul 18, 2011 | Chevrolet Silverado Cars & Trucks

1 Answer

'02 Rendevous beeping randomly, no lights or trouble indicatiors on. Beeps when parked, beeps while driving, no rhyme or reason apparant. sometimes goes 10 or 15 minutes without beeping, other times beeps...


The audible warnings alert the driver of a system concern or a critical vehicle condition. The radio generates the audible warnings through the left front speaker. The radio receives audible warning requests via the class 2 serial data line from the IPC or body control module (BCM). If the radio receives multiple audible warning requests, the warning with the highest priority sounds first. The following lists the audible warning priority and the pulse rate:
Fast rate chime--200 pulses per minute
Medium rate chime--150 pulses per minute
Slow rate chime--50 pulses per minute
Single chime

Is the sound heard different from typical Audible Warnings ?

Fasten Safety Belt Warning
The radio activates the fasten safety belt audible warning as requested by the IPC. The IPC sends a class 2 message to the radio indicating the chime frequency, slow rate and duration (5 pulses). The fasten safety belt warning sounds and the fasten safety belt indicator illuminates when the following occurs:
• The ignition switch transitions to ON.
• The inflatable restraint sensing and diagnostic module (SDM) detects that the driver's seat belt is not buckled, signal is low. The IPC receives a class 2 message from the SDM indicating the driver's seat belt status.
If the seat belt is buckled when the ignition is turned on, the chime does not sound. If the seat belt is buckled while the chime is sounding, the chime stops. If the seat belt is unbuckled after the initial transition to ON, the chime does not sound.
Headlamps On Warning
The radio activates the headlamps on warning as requested by the body control module (BCM). The BCM sends a class 2 message to the radio indicating the chime frequency, fast rate and duration, continuous. The headlamps on warning sounds when the following occurs:
• The ignition is OFF.
• The BCM determines that the driver's door is open, signal is low.
• The BCM determines that the headlamp switch is in the park or head position.
Key-In-Ignition Warning
The radio activates the key-in-ignition audible warning as requested by the BCM. The BCM sends a class 2 message to the radio indicating the chime frequency, medium rate and duration, continuous. The key-in-ignition warning sounds when the following occurs:
• The ignition switch is OFF.
• The body control module (BCM) determines that the driver's door is open, signal is low.
• The BCM determines that the key-in-ignition switch is closed, signal is low.
Turn Signal Reminder
The radio activates the turn signal warning as requested by the IPC. The IPC sends a class 2 message to the radio indicating the chime frequency, medium rate and duration, continuous. The turn signal warning sounds when the following occurs:
• The ignition switch is in the RUN position.
• The turn signal switch is in either turn position, sensing, within 1 second, an open to B+ transition in the turn signal control circuit, left or right turn.
• The vehicle has traveled a distance of 1.2 km (¾ mi) by counting pulses on the vehicle speed input circuit.
The IPC turns OFF the turn signal reminder when either the ignition switch is turned to the OFF position, or the turn signal switch returns to the OFF position, sensing, within 1 second, no transitions from open to B+ in either of the turn signal control circuits, left turn or right turn.
Additional Chimes
The following chimes will turn ON when an associated indicator/message turns ON in the IPC/DIC:
• ABS indicator
• AWD Disable indicator
• Battery/Charge indicator
• Brake indicator
• Change Engine Oil indicator
• Door Ajar indicator
• Hot Coolant Temp indicator
• Low Brake Fluid indicator
• Low Fuel indicator
• Low Oil Level indicator
• Low Oil Pressure indicator
• Low Tire Pressure indicator/reset
• Low Washer Fluid indicator
• MIL (Service Engine Soon) indicator
• Oil Life Reset
• Park Lamp Out indicator
• Rear Hatch Ajar indicator
• Service Traction System indicator
• Service Vehicle Soon indicator
• TRAC OFF indicator
For a description of an indicator refer to Indicator/Warning Message Description and Operation .
For diagnosis of an indicator refer to Symptoms - Instrument Panel, Gages and Console .

Did the Mechanic check for DTC'S - diagnostic trouble codes in the BCM or insturment cluster ? Did you try a Buick dealer ?

Jul 09, 2017 | 2002 Buick Rendezvous

1 Answer

Door ajar light stays on or flickers


Every door has its own door ajar sensor/switch, one is sticking and giving the false light, the system can be tested to find out which of the sensor is the problem with a scanner that reads the signal from the door sensors, since of the doors and the lift-gate (if applicable) can cause the light it only makes sense to have the scan done.

Jan 16, 2011 | Toyota 4Runner Cars & Trucks

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