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Water intrusoin into gem/cjb - Expedition Ford Cars & Trucks

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You will have to locate the leak, most likely it will be a windshield leak, this is what I have seen in the past on this issue.

Posted on Aug 07, 2008

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2003 ford focus no taillights,, no license plate light all fuses are good. Does any one know how to test the head light switch?


Before testing the headlight switch, check for a defective general electronics module (GEM) and 15A FUSE 32 in the central junction box (CJB). These components could be the source of exterior lighting problems.

Nov 03, 2016 | 2003 Ford Focus

1 Answer

2003 ford ranger windshield wiper won't come on. Replaced fuse, relays, switch and motor. I'm lost. No sign of an SJB in this truck.


No smart junction box , GEM - generic electronic module ! this module energizes the relays in the battery junction box ! The gem module is behind the center of the dash !
Generic Electronic Module (GEM) Removal and Installation
  1. > CAUTION: Prior to removal of the generic electronic module (GEM), it is necessary to upload module configuration information to the diagnostic tool. This information needs to be downloaded into the new module once installed. For additional information, refer to Section 418-01 .
    Depower the supplemental restraint system (SRS). For additional information, refer to Section 501-20B .
  1. Remove the radio chassis. For additional information, refer to Section 415-01 .
  1. Remove the center instrument panel finish panel.
    1. Remove the screws.
    1. Remove the center instrument panel finish panel.
    • Disconnect electrical connectors.
    • Module Controlled Functions The multifunction modules consist of the following:
      • generic electronic module (GEM)
      • central security module
      The GEM controls the following features:
      • front wiper and washer
      • warning chime
      • battery saver
      • illuminated entry and interior lighting
      • driver one-touch down power window (optional)
      • battery saver relay
      • door ajar warning indicator lamp
      • safety belt warning indicator lamp
      The central security module controls the following features:
      • remote keyless entry
      • computer-operated lock system
      • trim switch unlock inhibit
      It's more then likely to have DTC'S diagnostic trouble codes stored in it's memory !
    • B1431 Wiper Brake/Run Relay Circuit Failure GEM REFER to Section 501-16 . B1432 Wiper Brake/Run Relay Circuit Short to Battery GEM REFER to Section 501-16 . B1434 Wiper Hi/Low Speed Relay Circuit Failure GEM REFER to Section 501-16 . B1436 Wiper Hi/Low Speed Relay Circuit Short to Battery GEM REFER to Section 501-16 . B1438 Wiper Mode Select Switch Circuit Failure GEM REFER to Section 501-16 . B1441 Wiper Mode Select Switch Circuit Short to Ground GEM REFER to Section 501-16 . B1446 Wiper Park Sense Circuit Failure GEM REFER to Section 501-16 . B1450 Wiper Wash/Delay Switch Circuit Failure GEM REFER to Section 501-16 . B1453 Wiper Wash/Delay Switch Circuit Short to Ground GEM REFER to Section 501-16 . B1458 Wiper Washer Pump Motor Relay Circuit Failure GEM REFER to Section 501-16 . B1460 Wiper Washer Pump Motor Relay Circuit Short to Battery GEM REFER to Section 501-16 . B1462 Safety Belt Switch Circuit Failure GEM REFER to Section 413-09 . B1466 Wiper Hi/Low Speed Not Switching GEM REFER to Section 501-16 . B1473 Wiper Low Speed Circuit Motor Failure GEM REFER to Section 501-16 . B1476 Wiper High Speed Circuit Motor Failure GEM REFER to Section 501-16 Your wipers do not work at all ? did you check this fuse Central Junction Box (CJB) fuse 16 (30A)
      • The wipers are inoperative
      • Central junction box (CJB) fuse:
        • 16 (30A)
      • Circuitry.
      • GEM.
      • Multifunction switch.
      • Wiper run/park relay.
      • Wiper HI/LO relay.
      • Wiper motor.
      • GO to Pinpoint Test A .
      Before replacing parts you need to test , check for codes !

Mar 09, 2015 | Ford Cars & Trucks

1 Answer

Terminal 15 keeps blowing in my 2001 ford f150 supercrew 4x4 lariat i dont know what to do. wont go into gear, lights wont work, windows wont roll down. what should i do???


Central Junction Box / cab fuse panel Fuse 15 ( 5A ) feeds the GEM Module

A leaking windshield ( lower left hand corner ) can cause water to get on the back of the CJB, and corrode the pins to the GEM.

May 30, 2011 | Ford F-150 Cars & Trucks

1 Answer

Why doesn't my auto window button work on my ford 01 f150. The window rolls down fine but the auto function doesn't work. It started doing that after I changed a bad battery and put in a new one.


. May need to reprogram module due to disconnect.
CAUTION: Prior to removal of the GEM, it is necessary to upload module configuration information to a diagnostic tool. This information needs to be downloaded into the new module once installed. For additional information, refer to Section 418-01.


----------------
The following is list of GEM/CTM-controlled functions:
  • wipers/washers (front/rear)
  • warning chimes
  • battery saver
  • illuminated entry and courtesy lamps
  • accessory delay
  • driver power window (GEM only)
The GEM constantly monitors its subsystems for concerns. If a concern is found in one of the subsystems, the GEM will record the concern in the form of a diagnostic trouble code (DTC). The ignition switch position is very important to the GEM function. Often times, erratic or unexpected GEM function can be traced to concerns with ignition switch inputs.

Principles of Operation:
The generic electronic module (GEM) controls the opening of the driver window by activating the one-touch down window relay.
The GEM controls manual down and auto down window movement with the down window relay. The relay is activated by applying ground directly to one side of the down window relay coil, and deactivated by removing the ground signal. The delayed accessory relay provides power for the operation of the power windows and the roof opening panel (if equipped). The delayed accessory feature is active when the ignition switch is in the RUN or the ACC position, or when the ignition switch is changed from RUN or ACC to the OFF/LOCK position and the driver and passenger doors are closed.
Down window motion operates in two modes, manual mode and auto mode. When the GEM detects the first down position, first detent on the switch, it enters manual mode. In manual mode, the window will move downward only while the switch is depressed. Similarly, when the GEM detects the second down position, second detent on the switch, it enters auto mode. In auto mode, the window will open completely with just a momentary press of the switch.
the GEM will activate the one-touch down window relay until one of the following conditions is met:
  • The driver window control switch is pushed to the UP position.
  • The driver window control switch is released (OFF position) and then moved to the down position (first detent) or the one-touch down position (second detent).
  • Seven seconds have elapsed since the one-touch down feature was initiated.
  • A window regulator motor stall condition is detected on the one-touch down sense line inputs.
The GEM will deactivate the delayed accessory feature when:
  • the driver/passenger door is ajar and the ignition switch is in the OFF/LOCK or KEY-OUT position.
  • 10 minutes have elapsed since the ignition switch was changed from ACC or RUN to the OFF/LOCK position.
Inspection and Verification
  1. Verify the customer concern by operating the system.
  1. Visually inspect for obvious signs of mechanical or electrical damage.

    Visual Inspection Chart
    Mechanical Electrical

    • Window regulator motor
    • Window glass
    • Central junction box (CJB) Fuse:
      • 6 (5A)
      • 8 (5A)
      • 15 (5A)
      • 17 (10A)
      • 18 (5A)
      • 20 (5A)
    • Battery junction box (BJB) Fuse:
      • 103 (50A)
      • 110 (30A)
      • 116 (40A)
      • 601 (30A)
    • Relay(s)
    • CJB
    • BJB
    • Window control switch
    • Window regulator motor
    • GEM
    • Circuitry
    • Damaged wiring harness
    • Loose or corroded connector(s)

  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the scan tool does not power up:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch is in RUN position.
    • If the scan tool still does not power up, refer to the scan tool manual.
  1. Carry out the DATA LINK DIAGNOSTICS test. If the scan tool responds with:
    • CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00.
    • SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the GEM.
  1. If the DTCs retrieved are related to the concern, go to the GEM Diagnostic Trouble Code (DTC) Index to continue diagnostics.
  1. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.
------------------------------------------------
  • The one-touch down feature is inoperative
  • Circuitry.
  • Battery saver relay.
  • One-touch down relay.
  • Driver window control switch.
  • Driver window regulator motor.
  • Central junction box (CJB).
  • Generic electronic module (GEM).

Mar 30, 2011 | 2001 Ford F150 Styleside SuperCrew

2 Answers

My 1998 F 150 4.6 4*4 auto Problem Lites and air fan can randomly come on spontaneously when the truck is shut off and consequently kills the battery. It seems to be more prevalent in wet weather or in...


The symptoms sound similar to the Soaked GEM issue that some F-150s had. The usual cause is the Windshield on the driver's side leaks, and allows water to get into the cab, soaking the GEM ( Generic Electronic Module ) which is mounted to the back of the CJB ( aka Central Junction Box / Cab fuse panel ). The other source of the leak has been linked to the power sun roof, where the drains a re blocked, and the water comes inside the cab down the A pillar )

1st thing is to have the windshield pulled and resealed, you might want to think about replacing it, if it is bad enough. This is to stop the water coming into the cab of the truck.

Next is to dry out the cab of the truck, to see if the symptoms go away. I have seen this be done via running the truck with the AC on, and the temp high ( heat with the humidity control of the AC ) or a space heater on the driver's side floor board in a garage to dry out behind the dash.

I would say drying out the truck cures the issues long term ~ 60% of the time ( after fixing the windshield ). If the leak has happened for too long, the GEM to CJB connectors might have corrosion on them, or the GEM damaged, causing the CJB to be removed and the connections cleaned and / or the GEM replaced.

There are 5 GEM versions for your MY, so if you get one from a bone yard, make sure it is the same ESOF 4x4, do not use a MSOF ( Manual Shift On the Fly ) 4x4 GEM, they are not interchangeable.

1997 Service Manual GEM removal directions in PDF ( Right Click Save As )
http://my.voyager.net/~sscully/1997F150GemRemovalandInstallation.pdf

Nov 17, 2010 | 1998 Ford F150 Regular Cab

2 Answers

Wipers come on on there own. I already know it is not the multifunction switch. What else could it be?


THIS IS A BAD MULTI FUNCTION SWITCH ..REPLACE THE STALK THAT THAT CONTROLS WIPERS TURN SIGNALS ETC..BEEN THERE DONE THAT...GOOD LUCK

Oct 25, 2009 | 1999 Ford F150 Regular Cab

1 Answer

Wiper blades stopped working on 2000 Taurus


  • Central junction box (CJB) Fuse 211 (15A), Fuse 215 (30A)
  • Multifunction switch
  • Wiper run/park relay
  • Wiper high/low relay
  • Windshield wiper motor
  • Circuitry
  • Battery junction box (BJB)
  • CJB
  • Generic electronic module (GEM)
-------------------------
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Apr 09, 2009 | 2000 Ford Taurus

1 Answer

All windows will not work on my 2005 ford taurus


2002 taurus. don't have 2005. Sorry.

Could be your GEM module. Call your dealer and ask if your 2005 has GEM module. It's expensive so be sure it is problem first.

Dealer can test with NGS tool.

CAUTION: Once the new module is installed, it is necessary to download the module configuration information from the diagnostic tool equipment into the new module. For additional information, refer to Section 418-01 .

Principles of Operation
The generic electronic module (GEM) constantly monitors its subsystems for concerns. If a concern is found in one of the subsystems, the GEM will record the concern in the form of a diagnostic trouble code (DTC).
The ignition switch position is very important to the GEM functionality. Erratic or unexpected GEM functions can often be traced to problems with these ignition GEM inputs.
The GEM controls a variety of systems:
  • windshield wipers
  • courtesy lamps
  • warning chimes
  • keyless entry
  • interior and exterior lamps
  • power windows
  • parking brake actuator warning chime
Inspection and Verification
  1. Verify the customer concern by operating the system.
  1. Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Electrical
  • Central junction box (CJB) fuse 216 (15A)
  • Damaged wiring harness
  • Loose or corroded connector(s)
  • Circuitry
  • Generic electronic module (GEM)

Mar 27, 2009 | 2005 Ford Taurus

1 Answer

Key Pad Entry does not work


does the key pad light when you press a button at night? If yes, the fuse is ok.
Do you have the plastic card with the permanent code in your owner manual packet? If yes, tryit.
report back.

Keyless Entry The keyless entry keypad is hardwired to the GEM. The GEM interprets the inputs from the keyless entry keypad and then controls the associated operation. The keyless entry keypad will be illuminated for five seconds when any button is pressed. Additionally, it will request the illuminated entry feature to turn the courtesy lamps on. If a lock all doors code is entered, the illumination will turn off, as well as request the illuminated entry feature to turn off the courtesy lamps. When pressed, the keyless entry keypad supplies the ground signal to the GEM or the GEM receives a signal from the keyless entry remote transmitter. Then the GEM outputs a ground signal to the appropriate lock or unlock relay which supplies the power to the actuator to lock or unlocks all doors, including the luggage compartment. The keyless entry remote transmitter also unlocks the liftgate or activates the panic alarm by sending a signal to the GEM.
--------------------------------------------------------------- Visual Inspection Chart Mechanical Electrical
  • Keyless entry keypad
  • Keyless entry remote transmitter
  • Central junction box (CJB) Fuse F222 (20A)
  • Circuitry
  • Generic electronic module (GEM)
------------------------------------------------------------------------
  • No communication with generic electronic module (GEM)
  • Generic electronic module.
  • Circuitry.
  • REFER to Section 419-10 .
------------------------------------------------------------------------------------

Mar 08, 2009 | 2003 Ford Taurus

1 Answer

Fuse or what


Your multifunction switch on the steering column controls your exterior lights. The GEM module controls the interior lights and other stuff. If bad, it would not blow fuses. WHich fuse blows?
Your Ford dealer might be familiar with this issue, so call the service dept and ask them and get a quote. It may be wiring.
reoprt back.

  • The high beams are inoperative
  • Circuitry.
  • Multifunction switch.
  • Go To Pinpoint Test C .


--------------------------------------------------------------
Principles of Operation
Generic Electronic Module (GEM) The generic electronic module (GEM) receives inputs from the following:
  • door ajar switches
  • liftgate ajar switch (wagon)
  • liftgate glass switch (wagon)
  • headlamp switch
  • keyless entry keypad switches
  • the powertrain control module (PCM) (vehicle speed signal)
  • ignition switch
  • remote keyless entry transmitter
The GEM uses these inputs to control the output to the battery saver relay and interior lamp relay. Both relays are integral to the central junction box (CJB) and cannot be accessed directly.
Interior Lighting Systems The GEM grounds the battery saver relay and interior lamp relay coils when any door ajar switch or the headlamp switch is closed. The interior lamp relay then supplies power to the interior lamp circuit. Vehicle speed must be less than 15 kph (9 mph) for the GEM to ground the interior lamp relay. The interior lamps will remain illuminated for a period of up to 25 seconds after all doors are closed or until the ignition is switched from the OFF position, or the GEM receives a vehicle speed signal. Actuating the interior lights from the headlamp switch will operate at any time.
Illuminated Entry Illuminated entry is activated when a keyless entry keypad switch provides ground on the GEM input or when the GEM receives an unlock signal from the remote keyless entry key fob. The GEM then provides ground to the battery saver and interior lamp relay coils. Illuminated entry is deactivated when the GEM receives a lock signal from the remote keyless entry key fob or if the GEM receives ground inputs from the keyless entry keypad switch lock code. Illuminated entry will also be deactivated when the GEM receives input voltage from the ignition switch.
Battery Saver The battery saver is activated when the GEM is not receiving voltage input from the ignition switch (off position). The GEM will then provide ground to the battery saver relay coil for a maximum of 30 minutes depending on the state of the interior lamp switch inputs to the GEM. The energized battery saver relay switches voltage to the demand lamp circuit and the interior lamp relay coil. After time-out, the GEM removes ground to the battery saver relay disabling the demand lamp circuit.
Puddle Lamps The puddle lamp relay operates reverse from the battery saver relay and the interior lamp relay. The puddle lamp relay coil receives voltage when the ignition switch is in the START or RUN position, which disables the circuit to the puddle lamps.
Inspection and Verification
  1. Verify the customer concern by operating the system.
  1. Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Electrical
  • Battery junction box (BJB) fuse 101 (60A)
  • Central junction box (CJB) fuse 226 (10A)
  • Bulb(s)
  • Central junction box (CJB)
  • Generic electronic module (GEM)
  • Connectors
  • Circuitry



Feb 20, 2009 | 2003 Ford Taurus

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