Question about 1998 Ford Expedition

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Electrical system on after car is off

Mechanic said either gem or fuse panel is bad

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  • firstout2964 Dec 11, 2008

    The interior lights will not turn off even when the vehicle is turned off

  • yadayada
    yadayada May 11, 2010

    I doubt that

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  • Ford Master
  • 1,224 Answers

Did you recently have a sterio wired up cause most them wires to the sterio also run the electronics but overall i believe that someone crossed the pcm wire to the main computer which electrical is staying on

the other thing is the pcm relay is bad
also the door light pin when you close the door is stuck open when door shut after opened i had this same problem i just replaced the door light switch

Posted on Dec 06, 2008

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1 Answer

How dose the 4x4 get it's power on a 1998 f250


How Does .
Well , the 4X4 mode switch on the instrument panel get Power from the GEM - genaric electronic moduel . The transfer case shift module get's power from fuse #17 30amp located in the power distribution box . The transfer case electric clutch relay gets power from fuse # 23 10amp located in the junction box fuse / relay panel . System controlled by the GEM module . Could have DTC'S - diagnostic trouble codes stored in the GEM

Mar 04, 2017 | Ford F-250 Cars & Trucks

1 Answer

Door ajar light stay on


Door ajar switch is bad or you have a wiring problem ! Which door ?
B1322 Door Ajar Driver Circuit Short to Ground GEM/CTM REFER to Section 417-02 . B1323 Door Ajar Lamp Circuit Failure GEM/CTM REFER to Section 413-01 . B1325 Door Ajar Lamp Circuit Short to Battery GEM/CTM REFER to Section 413-01 . B1330 Door Ajar RF Circuit Short to Ground GEM/CTM REFER to Section 417-02 . B1334 Decklid Ajar Rear Door Circuit Short to Ground GEM/CTM REFER to Section 417-02 . B1338 RR Door Ajar Circuit Short to Ground GEM/CTM REFER to Section 417-02 . Inspection and Verification
  1. NOTE: The generic electronic module (GEM)/central timer module (CTM) must be reconfigured upon replacement. Refer to the scan tool help screen on the configuration card to program the tire size and axle ratio.
    The warning lamps are a GEM/CTM controlled system; refer to Section 419-10 .
  1. Verify the customer concern by operating the system in question.
  1. Visually inspect for the following obvious signs of mechanical and electrical damage.

    Visual Inspection Chart Mechanical Electrical
    • Switch(es)
    • Fuse(s)
    • Damaged wiring harness
    • Loose or corroded connections
    • Circuitry
    • Bulb
  1. If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
    • check that the program card is properly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  1. If the scan tool still does not communicate with the vehicle, refer to the New Generation STAR Tester manual.
  1. Perform the DATA LINK DIAGNOSTIC TEST. If scan tool Tester responds with:
    • CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00 .
    • NO RESP/NOT EQUIP for GEM/CTM, go to Pinpoint Test E.
    • SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and perform self-test diagnostics for the GEM/CTM.
  1. If the DTCs retrieved are related to the concern, go to the GEM/CTM Diagnostic Trouble Code (DTC) Index to continue diagnostics.
  1. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics.

Aug 20, 2016 | 2002 Ford Explorer

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

No radio and power windows,replaced fuse,blew again


If it happened at the same time...

It could possibly be the GEM module. If you have any other weird electrical issues like your dome light staying on or your automatic headlights not working then it's probably the GEM module. If it is the GEM then you have to have the new one flashed(programmed) by the Ford dealer. The GEM is basically a computer for all your non-critical electrical stuff. The ignition and fuel systems use the main ECM computer while everything else that is secondary will go thru the GEM.
Of course it may just be a common power wire or circuit that operates your power windows/locks and radio that has a short or bad relay or switch. The main driver side switch will distribute power to all the locks and windows. If that switch is not getting power then it none of your windows or locks will work. The radio is usually on a separate circuit and operates thru a fuse in the fuse panel. If these things happened at different times then it's probably a wiring, fuse, relay, or switch issue.

Feb 18, 2015 | 2001 Ford Windstar

1 Answer

My headlights blink on & off as I'm driving down the highway! Can't drive at night anymore because of this!


1) Get out your owner's manual and turn to the fuse panel diagram
2) Locate and replace the fuse responsible for your headlights (might be separate fuses for each headllight)
3) If this isn't the issue, it's possible a relay is bad. They should be located with your fuse panel and can be replaced easily. You can get them from any auto parts store for a modest price.
4) If you've replaced the relays and the fuses and still have the issue, it's possible it's the GEM module. This is quite a bit trickier and you'll likely need a qualified mechanic to replace it. I'd recommend taking it to a mechanic before trying the GEM module because it might also be a short in the wiring. Either way, leave those jobs for the pros.

Dec 06, 2010 | 1999 Pontiac Montana

1 Answer

Location of the Horn Relay on a 2005 Ford Taurus Horn doesn't work fuse is Ok and wiring looks good, as well as the horns.


horn may be bad too.

Visual Inspection Chart Mechanical Electrical
  • Horn
  • Horn switch
  • Horn relay
  • Battery junction box (BJB) fuse 101 (60A)
  • Central junction box (CJB) fuses:
    • 216 (15A
    • 230 (15A)
  • Wiring harness
  • Loose or corroded connections
  • Speed control servo or jumper
  • Clockspring
  • Generic electronic module (GEM)


horn relay is in central junction box (fuse panel) under left side of dash.

Nov 03, 2009 | 1999 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

I need installation directions for installation of a gem module


here it is but you must have it configured.

Generic Electronic Module (GEM) —Generic Electronic/Central Timer (GEM/CTM) Removal
NOTE: The GEM must be reconfigured upon replacement. Refer to the scan tool help screen on the Ford Service Function (FSF) card to program tire size and axle ratio.
  1. syo~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Electronic modules are sensitive to electrical charges. If exposed to these charges, damage may result.
    Disconnect the battery ground cable. For additional information, refer to Section 414-01 .
  2. syo~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Use care when removing the instrument panel steering column cover (044F08) or damage to the cover locating tab may occur.
    Remove the instrument panel steering column cover.
    1. Unlock the retainers.
    1. Remove the instrument panel steering column cover.
  3. Disconnect the bulkhead connectors from the instrument panel fuse junction panel.
    1. Loosen the bolts.
    1. Disconnect the bulkhead connectors.
  4. Position the instrument panel fuse junction panel aside.
  5. Remove the nuts.
  6. Remove the bolts.
  7. Remove the generic electronic module/central timer module (GEM/CTM).
    1. Disconnect the electrical connectors.
    1. Remove the screws.
    1. Remove the GEM/CTM.

Feb 20, 2009 | 2000 Ford F250 Super Duty Crew Cabs

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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