What the GEM controls

Discussion in 'Electrical' started by stamp11127, Aug 13, 2014.

  1. stamp11127

    stamp11127 Super Moderator Staff Member

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    These are a few of the inputs/outputs:
    Defrost Relay Ground
    Park/Headlamps On input
    Interval Delay Input
    Park Sense
    Wiper Hi/Lo Relay
    Run/Park Relay Control
    Windshield Wiper Mode Select
    Front Washer Pump
    Door Ajar Indicator
    Seat Belt Indicator
    Left Front Door Ajar input
    Left Rear Door Ajar input
    Right Front Door Ajar input
    Right Rear Door Ajar input
    Lift Gate Door Ajar input
    Illuminated Entry Input
    Brake Pedal Position Input
    Low Range output to PCM
    Hall Effect Power
    Rear Speed Sensor Input
    4x4 Mode Switch
    Torque on Demand Relay
    Front Speed Sensor
    AWD Engaged Output
    Neutral Sense Input
    ABS Active Input
    Rear Washer Pump Control
    Low Washer Fluid Lamp
    Rear Wiper Hi/Lo/Park Sense
    Rear Wiper Up Relay Control
    Rear Wiper Down Control
    Rear Wiper Switch Control
    Washer Fluid Level Switch
    Courtesy Lamps
    Power Windows
    Instrument Cluster
    Anti-Lock Brake System
    All Wheel Drive
    Safety Belts
    Ignition key Warning
    Restraints Control Module
    Rear Window Defrost
    Radio - (Premium Sound 2001)

    and I'm sure there are a few that I've missed.....
    I'll update the list as I run across additions to it.
     
    Last edited: Sep 1, 2014
    babycritter and poorboy1964 like this.
  2. babycritter

    babycritter Member

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    That's very handy. Can they go a little bad?
     
  3. Pappy

    Pappy Full Access Members

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    Can one be "a little" pregnant?

    The P0500 DTC is listed as a GEM code by FORScan. Vehicle Speed Sensor circuit.
     
  4. Ben schreffler

    Ben schreffler New Member

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    I have the following problems could this be the gem or should I start chasing wires automatic lights do not work 4x4 does not work door ajar light always on interior lights don’t come on when I open the door doors do not lock automatically when you drive all this comes and goes with no time or reason and all at the same time
     
  5. Bedrck47

    Bedrck47 Full Access Members

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    Ben Your 2003 expy doesn't have a GEM Module However it does have a Vehicular Security Module and also the fuse box is also called a Smart Junction Box.

    You would be best to start a new thread explaining your problems and also the year of your Expedition along with engine size
     
  6. LordBerp

    LordBerp Member

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    Is there any way to get a pinout of the GEM for a 2002?
     

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