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Mustang GEM module repair - Cars & Trucks

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6ya6ya
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Posted on Jan 02, 2017

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seans46
  • 161 Answers

SOURCE: Location of GEM Module on 1998 Ranger

i am almost sure it is in steering col area by firewall. but call any part store like auto zone and they can print it out and tell you if your ford dealer wont. but on the fords they usualy are all in the drivers steering area sometimes way up by fire wall

Posted on Jun 15, 2009

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SOURCE: Where can you find a gem module for a 1995 mustang?

You can check the internet for the part, or you can call a junk yard, the dealership will charge a fortune for that part...........the gem module is part of the on-board computer, they generaly run anywhere from $100.00 and up over $1,000.00 so do not be suprised if it costs around $1,500.00 depending on if you still can get that part from a dealership or parts store......

Posted on Jul 24, 2009

  • 45 Answers

SOURCE: Where is the gem module on a 1995 mustang gt?

Ford has mounted these in 2 different areas.
1. Under the dash, either pass side or divers side.
2, Or in the engine compartment located next to the Power Dist Box,, Black in color.
If you can not find the location call your Ford Dealer, or a Chiltons Manual should have the location

Posted on Aug 07, 2009

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How do i replace the GEM


Cassidy, Links below to GEM.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

GEM Module Reprogramming Ford Truck Enthusiasts Forums

The leaky windshield GEM module problem with twist Ford F150 Forum...
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What is an Engine Control Module ECU ECM Repair

Mar 03, 2016 | 2002 Ford Ranger

1 Answer

Limited. What is causing battery drain?


To find out what is draining the battery do a parasitic draw test . How To Perform Parasitic Draw Test EricTheCarGuy Test to be sure , before replacing GEM module .I would also have the GEM checked for DTC'S - diagnostic trouble codes . I would also check the battery saver relay .
SECTION 417-02: Interior Lighting 2000 Explorer/Mountaineer Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 06/17/1999 Interior Lighting The interior lighting system consists of the following:
  • dome/map lamp
  • rear dome/cargo lamp
  • overhead console/map lamp
  • RH/LH vanity mirror
  • ash receptacle lamp
  • puddle lamps
  • interior lamp switches
  • interior lamp relay
  • dimmer module
  • battery saver relay
  • generic electronic module (GEM)
Generic Electronic Module (GEM)/Central Timer Module (CTM) Controlled Functions
The generic electronic module (GEM) is equipped on four-wheel drive vehicles with power windows. The central timer module (CTM) is equipped only on two-wheel drive vehicles without power windows.
NOTE: GEM/CTM diagnostics are compatible with the scan tool.
The GEM/CTM incorporates the functions of several different modules into one, and offers diagnostics to easily locate and repair concerns affecting the subsystems that it controls.
The GEM/CTM constantly monitors the systems it controls and reports a concern in the form of a diagnostic trouble code (DTC). A DTC can be retrieved with the scan tool through the communication link.
The scan tool is a menu-driven tester that allows the user to run specific tests. The scan tool can isolate faults in the GEM/CTM subsystems through a symptom-driven diagnostic procedure. Connecting the scan tool to the GEM/CTM communication link will not alert the GEM/CTM. If the GEM/CTM is "asleep" when the diagnostic connector is plugged in, the GEM/CTM must be "awakened". If the communication link cannot be established, turn the ignition to RUN.
NOTE: The GEM/CTM has a sleep function to minimize battery consumption. During the sleep mode, the GEM/CTM turns off all outputs and monitors only the following:
  • door ajar (driver door, passenger door, liftgate, LH rear and RH rear doors).
  • key-in-ignition.
  • key in RUN or ACC.
  • two-step unlock switch (unarm switch).
  • digital TR sensor.
  • illuminated entry request (remote anti-theft personality [RAP] module).
If a change of status occurs at one of these inputs while the GEM/CTM is "asleep", the GEM/CTM will "wake up." When the GEM/CTM awakens, it carries out an internal self-test, and begins normal operation. At this point, the GEM/CTM will have all of its functions operational.
The GEM/CTM will go into the sleep mode immediately after both of the following conditions have been met:
  • key in OFF or key not in ignition.
  • after 45 minutes with no change in any wake-up input.
The GEM/CTM control system has two modes of operation; the normal operating mode and the tester-dependent diagnostics mode.
Normal operation of the GEM/CTM can detect errors. An integral part of normal GEM/CTM operation is continuous diagnostic capability. Continuous diagnostics detects errors and changes the GEM/CTM control strategy. There is no warning lamp for the GEM/CTM; therefore, a DTC concern will direct you to the GEM/CTM. Examples of faults that may be detected during normal operation include:
NOTE: The GEM/CTM can only detect open circuit/short to GRD faults when the GEM/CTM is not energizing a load, and short to battery faults when the GEM/CTM is attempting to energize a load.
  • GEM/CTM continuous self-test (RAM, ROM, EEPROM, A/D checking).
  • output driver monitoring (open circuit/short to ground [GRD], short to power).
  • illogical combinations of input signals.

Dec 01, 2015 | 2002 Ford Explorer

2 Answers

I bought a 99 ford mustang without a radio installed yet there is an aftermarket radio in the back seat, the wipers are not working and i have checked the fuses they appear fine, i also pulled plug source...


Defective switch or wiring between switch and motor. The 1 wire that does have voltage is for the park function. I would pull the switch and test for voltages going into the switch, with ignition switch on, then turn the wiper switch on and see if you have any voltages coming out.

Mar 30, 2015 | Ford Mustang Cars & Trucks

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

Ford Explorer wipers, power windows, doom lights won't work


Are u assuming the GEM module is at fault ? Did you or your local auto electrician check for DTC'S - diagnostic trouble codes?
GEM/CTM Wiggle Test Diagnostic Trouble Code (DTC) Index DTC Description DTC Caused By B1317 Battery Voltage HIGH GEM/CTM B1318 Battery Voltage Low GEM/CTM B1322 Driver Door Ajar Circuit Short to Ground GEM/CTM B1330 Passenger Door Ajar Short to Ground GEM/CTM B1352 Ignition Key-In Circuit Failure GEM/CTM B1410 Driver Power Window Motor Circuit Failure GEM B1438 Wiper Mode Select Switch Circuit Failure GEM/CTM B1441 Wiper Mode Select Switch Short to Ground GEM/CTM B1446 Wiper Park Sense Circuit Failure GEM/CTM B1450 Wiper/Wash Interval Delay Switch Input Circuit Failure GEM/CTM B1453 Wiper/Wash Interval Delay Switch Input Short to Ground GEM/CTM B1462 Seat Belt Switch Circuit Failure GEM/CTM B1577 Park Lamp Input Circuit Short to Battery GEM/CTM B1610 Illuminated Entry Input (From RAP Module) Circuit Short to Ground GEM/CTM
Did you an your auto electrican check power an grounds for the GEM ? Voltage drop testing ? . Did you check power an ground circuits for the affected systems . Working when they want sounds more like a loose connection somewhere .
ECM Inputs and Outputs Diagnosis
Symptom Chart
Symptom Chart Condition Possible Sources Action
  • The Wipers Are Inoperative
  • CJB Fuse 16 (30A).
  • Circuitry.
  • GEM/CTM.
  • Multi-function switch (13K359).
  • Wiper run/park relay.
  • Wiper HI/LO relay.
  • Wiper motor.
  • DTC B1431.
  • DTC B1432.
  • DTC B1438.
  • DTC B1450.
  • DTC B1840.
  • GO to Pinpoint Test A .

Plus looking at GEM scan data on a factory scan tool .Too many people miss diagnose these system's because they don't have a clue .

Jul 03, 2017 | 1999 Ford Explorer

1 Answer

Gem Module, Fuse Box and Window Reseal


This 1997 Ford F150 needs the GEM module changed due to multiple conditions. To see testing that lead to this repair please click here. The GEM module is located t the rear of the interior fuse box.
dsc02823.jpg
The first step is to remove the trim panel that covers the gap between the upper side of the steering column and the dash. It just unsnaps from the dash. It makes it a little easier to remove if you move the shifter all the way down to drive 1.
dsc02824.jpg
With that out of the way the lower dash cover can now be removed. Most of the screws have 7 mm heads but there are two that have 8 mm heads.
dsc02825.jpg
Those two are at the lower edge of the fuse box.
dsc02826.jpg
One wiring harness needs to be disconnected from the panel.
dsc02827.jpg
Now the screws for the fuse box can be removed.
dsc02828.jpg
The wiring harnesses can be removed from the back of the fuse box. Two 10 mm headed bolts at the center of each connector.
dsc02829.jpg

Next remove the tube brace from around the bottom of the steering column. Four fasteners with 13 mm heads.
dsc02830.jpg

Now wiggle, pry and twist the fuse box and GEM module assembly down.
dsc02831.jpg
After the assembly is down far enough unplug the remaining harness connectors from the GEM module.
dsc02832.jpg
Almost there.
dsc02837.jpg
The assembly is now free of the vehicle.
dsc02833.jpg
The GEM module is held to the back of the fuse box by three phillips headed screws.
dsc02834.jpg
Easy to remove Now.
dsc02836.jpg
With the three screws removed the GEM unplugs from the back of the fuse box.
dsc02835.jpg
I put it all back together and checked my repair for power to the driver's power window switch.
dsc02842.jpg

Jan 10, 2012 | 2000 Ford Expedition

2 Answers

Power door locks wind shield wipers interior dome lights out in 2000 v6 mustang. #3 relay?


The wipers will not work on my 2000 mustang. I checked the fuse and i wasnt blown.

Dec 08, 2009 | 2000 Ford Mustang

1 Answer

Where is the gem module on a 1995 mustang gt?


Ford has mounted these in 2 different areas.
1. Under the dash, either pass side or divers side.
2, Or in the engine compartment located next to the Power Dist Box,, Black in color.
If you can not find the location call your Ford Dealer, or a Chiltons Manual should have the location

Aug 06, 2009 | 1995 Ford Mustang

1 Answer

Where can you find a gem module for a 1995 mustang?


You can check the internet for the part, or you can call a junk yard, the dealership will charge a fortune for that part...........the gem module is part of the on-board computer, they generaly run anywhere from $100.00 and up over $1,000.00 so do not be suprised if it costs around $1,500.00 depending on if you still can get that part from a dealership or parts store......

Jul 24, 2009 | 1995 Ford Mustang

1 Answer

Interior lights


What they are speaking of is the GEM module however this will not correct the concerns you have.
The GEM controls the following functions:
  • warning chimes and warning lamps
  • one-touch down window
  • windshield washers and wipers
  • battery saver
  • illuminated entry with keyless remote entry
  • interior lighting
Turn signals and hazzard lamps do not go thru the GEM module at all and the reverse lamps all the gem does there is look for reverse so it knows when to activate the auto lock doors when vehicle is in motion.
I suspect you have 2 or more problems here that you may want to get checked by an experienced Ford tech.Also the GEM has to be programed when replaced.It is not plug and play.

Feb 02, 2009 | 2002 Ford Mustang

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