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Where is the four wheel module located on a 2001 f350 7.3 l lariat 4x4 nothing on the four wheel drive works and I checked all the fuses and are all fine

Have it check for DTC'S - diagnostic trouble codes ?
GEM Diagnostic Trouble Code (DTC) Index
GEM Diagnostic Trouble Code (DTC) Index DTC Description Source Action C1728 Transfer Case Unable to Transition Between 2H and 4H GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. C1729 Transfer Case Unable to Transition Between 4H and 4L GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P0500 Vehicle Speed Sensor (VSS) Malfunction GEM GO to Pinpoint Test F . P1804 Transmission 4-Wheel Drive High Indicator Circuit Failure GEM GO to Pinpoint Test H . P1808 Transmission 4-Wheel Drive Low Indicator Circuit Failure GEM GO to Pinpoint Test I . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure GEM GO to Pinpoint Test E . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground GEM GO to Pinpoint Test E . P1819 Transmission Park/Neutral Position Switch Short Circuit to Ground GEM GO to Pinpoint Test F . P1820 Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1822 Transmission Transfer Case Clockwise Shift Relay Coil Short to Battery GEM GO to Pinpoint Test E . P1828 Transfer Case Counterclockwise Shift Relay Coil Circuit Failure GEM GO to Pinpoint Test E . P1830 Transmission Transfer Case Counterclockwise Shift Relay Coil Short Circuit to Battery GEM GO to Pinpoint Test E . P1832 Transmission Transfer Case Differential Lockup Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1834 Transmission Transfer Case Differential Lockup Solenoid Short Circuit to Battery GEM GO to Pinpoint Test G . P1865 Transmission Transfer Case Contact Plate Power Short to Ground GEM GO to Pinpoint Test E . P1866 Transmission Transfer Case System Concern - Servicing Required GEM CARRY OUT the electronic shift function test. REFER to Function Test - Electronic Shift in this section. P1867 Transmission Transfer Case Contact Plate General Circuit Failure GEM GO to Pinpoint Test E . P1876 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure GEM GO to Pinpoint Test G . P1877 Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Short to Battery GEM GO to Pinpoint Test G . - For All Other DTCs GEM GO to Section 419-10 .
Your best bet , take it to a qualified repair shop that has the diagnostic tool to trouble shoot .
Principles of Operation
Transfer Case - Electronic Shift
The four-wheel drive, electronic shift-on-the-fly feature electrically shifts the vehicle transfer case between 2WD, 4X4 HIGH, and 4X4 LOW. The system mode is selected by the operator through the mode select switch (MSS) on the instrument panel. The operator is informed which mode the system is in by two instrument cluster indicators, one for 4X4 HIGH which is 4X4, and one for 4X4 LOW which is LOW RANGE (in 4X4 LOW both the lamps are on). Shifts into 4X4 HIGH can be made at any speed. When shifting into 4X4 HIGH with the vehicle stationary, tooth blockage may occur, preventing shift completion. When the vehicle is driven above 8 km/h (5mph) the shift will complete. When shifting in or out of 4X4 LOW, the generic electronic module (GEM) requires that the vehicle speed be less than 5 km/h (3 mph), the brake pedal be applied, and the transmission in NEUTRAL (automatic transmission) or the clutch pedal be depressed (manual transmission). (The digital transmission range [TR] sensor informs the GEM when the automatic transmission is in the NEUTRAL range position.)
The gearmotor encoder assembly is mounted externally on the transfer case. It drives a rotary cam which moves the mode fork and the range fork within the transfer case between the 4X4 HIGH, 4X4 LOW, and 2WD range positions.
The GEM uses two relays to control the gearmotor encoder assembly shift between 4X4 HIGH, 4X4 LOW, and 2WD modes. The GEM controls the pulse vacuum hublock (PVH) solenoid which supplies engagement and disengagement vacuum to control the hublocks.
The GEM accomplishes shifts by interpreting inputs from:
  • mode select switch (MSS)
  • vehicle speed signal (transmitted from the ABS system)
  • gearmotor encoder plate position
  • brake pedal switch
  • digital transmission range (TR) sensor (automatic transmission)
  • clutch pedal position (CPP) switch (manual transmission)
  • ignition switch
Based on these inputs, the GEM controls the shifts into 2WD, 4X4 HIGH, or 4X4 LOW with the following outputs:
  • low to high relay (clockwise)
  • high to low relay (counterclockwise)
  • pulse vacuum hublock (PVH) solenoid
  • gearmotor encoder assembly
The electronic shift-on-the-fly (ESOF) system has a feature which allows the driver to override the vacuum operated hublocks. When the front hublocks are manually turned to the LOCK position, the hublocks are locked at all times, overriding the vacuum operated system. If the front hublocks are manually turned to the AUTO position, the hublocks can only be locked by turning the MSS to 4X4 HIGH or 4X4 LOW position.

Jun 12, 2017 | Cars & Trucks

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

My battery drains over night. i can hear a relay under the dash clicking. i remove no. 27 fuse and it stops. what is causing this?

Check your owners manual for the number 27 fuse to see what it is. Checking online I see it as a 15 Amp, Under hoop lamp, Map lights, Glove box lamp, Dome lamp, Visor lamps, Accessory delay, Dimmer switch illum. and 4x4 system. check each one to see if the bulb is blown but left on, at least if it's a light. It that doesn't do it, research how to check accessory delay and 4x4 system.

Mar 20, 2015 | 1996 Ford Explorer

1 Answer

Power door locks stopped working.

GEM stands for generic electronic module ,has nothing to do with the engine . The power door locks are controlled by the GEM energizing relays ! lock unlock relays . unplugging the GEM will do nothing . Testing the vehicle electric's and checking for DTC'S - diagnostic trouble codes is the first steps in diagnosing a problem of this type . Your best bet would be to take to a qualified repair shop . You have not the diagnostic tool or knowledge to diagnose this problem . Do yourself a favor before you make the problem worst . Messing with thing's you have no clue about can render your vehicle useless .

Aug 21, 2017 | 2000 Ford Focus

1 Answer

What does the abreiviation rcu and gem stand for?

GEM stands for Generic Electronic Module. RCU stands for Rear Control Unit. Your in dash radio is just a faceplate. The audio unit is in the trunk.

Apr 30, 2012 | 1999 Mercury Sable

4 Answers

I need a manual for samsung gem phone, where do I get one, I need help to learn how to use the phone so I don't have to return it cuz it is smarter than I am, Thanks, Jean

For the operating manual type "Samsung gem Operating Manual"into your search bar on your PC and download the manual for free.Save it to your PC and install where you then can read at leisure to get to know the phone.You will need Adobe reader and that you can also download if you do not have it on your phone Cheers.

Jul 07, 2011 | Samsung Cell Phones

1 Answer

I have a 17" Gem

You shouldn't need to install software for a monitor to work. What you may have to do though, is configure your display settings to allow an external display. Your laptop might have a function key to do this. Try clicking the function key + the key that looks like a monitor display on your laptops keyboard. This should activate the external display port. You might also try going into the control panel, select display and enable the secondary display. Also a 17 inch display probably has a screen resolution of 1024x768 or 1280x1024 so make sure you don't set the resolution any higher then that or the display might not show anything.

May 20, 2011 | 3G Technology GEM GL-822A/B 17" Flat Panel...

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

1 Answer

HELP, with my gem sx2 music keyboard, working fine until one morning it would not boot up for would get stuck when i turn it on... all i see is the buffering icon and the gem sx2...

I suspect an internal connector problem, maybe for floppy interface, that seek at boot when turned on.<br />Try to open the keyboard and gently disconnect and reconnect all internal cables (there are dozens). This is a very old model, but i enjoying it even today<br />

Nov 18, 2009 | Yamaha Full-Size Keyboard

2 Answers

Gem Sound CDM-150 Dual cd player

This is what I did to get a copy, I went on different store sites that sold this product and I found that some will advertise the product, it's functions and its instruction manual. When you find it just copy and paste the page.


May 21, 2008 | Gem Sound CDM-150 Mixer

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