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My gem exa 2955 at the back part of the amplifier theres a small black switch i just want to know the function of it ? thanks

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1999 Ford Explorer,Door ajar light & Chime goes on & off while driving,int lights & auto headlights won't shut off after car off & all doors closed.


Your best bet would be to find a Tech like this guy , with the right diagnostic equiment . Door Locks Go Crazy 1 Unless you know how to do automotive electrical testing . Your door ajar switch is a input to a body control module . or GEM as ford calls thiers .
Door Locks Go Crazy 2 Your auto lights are controlled pretty much the same .
Electric Testing Techniques You Need to Know

Do you know what DTC"S are ? diagnostic trouble codes ! You probably have a door ajar switch problem . You need a factory or professional type scan tool to check these codes
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 . B1340 Chime Input Request Circuit Short to Ground GEM/CTM GO to Pinpoint Test C .
  • The Autolamps Are On Continuously
  • Circuitry.
  • Headlamp relay.
  • Light sensor amplifier.
  • Go To Pinpoint Test H .
  • The Autolamp Time Delay Is Inoperative
  • Fuse(s).
  • Light sensor amplifier.
  • Headlamp switch.
  • Circuitry.
  • VERIFY parking lamp operation. If OK, REPLACE the light sensor amplifier. If any parking lamp concerns exist, Parking, Rear and License Lamps REFER to Parking, Rear or License Lamps.

Do you see how complex these systems can be for someone that doesn't deal with these problems on a daily base's ! Check for codes an if there are any , doing the diagnostic's associated with it . Without doing the diagnostic's you could replace parts all day long an not fix the problem .
2002 2005 Ford Explorer Door Ajar Light Common Door Wiring Faults



Apr 23, 2017 | Ford Cars & Trucks

1 Answer

99 f350 super duty, wipers would only come on sometimes. I changed wiper motor now they still don't work


The generic electronic module (GEM) responds to the windshield wiper control commands by interpreting inputs from the steering column multi-function switch. The speed dependent wipers will compensate for the extra moisture that accumulates on the windshield at higher speeds, except when the multi-function switch is in the INT 1 position. At higher speeds, the speed dependent feature shortens the delay between wipes when using the variable interval wipers. Delays will automatically adjust at speeds between 16 and 105 km/h (10 and 65 mph).
Testing should be done before replacing any parts . And if you don't know about (GEM) Control module controlled system's your best bet , take it to a qualified repair shop . The first place to start trouble shooting these systems is with a scan tool that can read GEM module codes .

B1840 Wiper Front Power Circuit Failure GEM GO to Pinpoint Test B . B1476 Wiper High Speed Circuit Motor Failure GEM GO to Pinpoint Test B . B1473 Wiper Low Speed Circuit Motor Failure GEM GO to Pinpoint Test B .
B1431 Wiper Brake/Run Relay Circuit Failure GEM GO to Pinpoint Test B . B1432 Wiper Brake/Run Relay Circuit Short to Battery GEM GO to Pinpoint Test B . B1434 Wiper Hi/Low Speed Relay Coil Circuit Failure GEM GO to Pinpoint Test D . B1436 Wiper Hi/Low Speed Relay Coil Circuit Short to Battery GEM GO to Pinpoint Test D . B1438 Wiper Mode Select Switch Circuit Failure GEM GO to Pinpoint Test B . B1441 Wiper Mode Select Switch Circuit Short to Ground GEM GO to Pinpoint Test C . B1446 Wiper Park Sense Circuit Failure GEM GO to Pinpoint Test B . B1450 Wiper Wash/Delay Switch Circuit Failure GEM GO to Pinpoint Test E . B1453 Wiper Wash/Delay Switch Circuit Short to Ground GEM GO to Pinpoint Test C . B1458 Wiper Washer Pump Motor Relay Circuit Failure GEM GO to Pinpoint Test F . B1460 Wiper Washer Pump Motor Relay Coil Circuit Short to Battery GEM GO to Pinpoint Test F .
If no codes are stored then you go here .
  • The Wipers Are Inoperative
  • Fuse(s).
  • Circuitry.
  • GEM.
  • Multi-function switch (13K359) (wiper/washer switch).
  • Windshield wiper run/park relay.
  • Windshield wiper HI/LO relay.
  • Windshield wiper motor (17508).
  • GO to Pinpoint Test B .

Your best bet , take it to a qualified repair shop that knows how to trouble shoot problems like this . This is no easy diagnose's .

Feb 07, 2017 | Cars & Trucks

1 Answer

Where is the BCM located on a 2000 lincoln navagator?


Ford , Lincoln , Mercury in that era called a GEM generic electronic module .
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 function. Often times, erratic or unexpected GEM function can be traced to problems with these GEM inputs.
The GEM controls the following features:
  • Wipers/washers (front/rear).
  • Warning chimes.
  • Battery saver.
  • Illuminated entry and courtesy lamps.
  • Driver power window.
  • Accessory delay.
  • 4-wheel drive.
  • Heated back lite/mirror.
Generic Electronic Module (GEM) C239
Behind center of I/P
syj~tr~en~file=ani_caut.gif~gen~ref.gif CAUTION: Prior to removal of the module, it is necessary to upload module configuration information to scan tool. This information needs to be downloaded into the new module once installed. For additional information, refer to Section 418-01 .
syj~tr~en~file=ani_caut.gif~gen~ref.gif CAUTION: Electronic modules are sensitive to electrical charges. If exposed to these charges, damage may result.

Jul 02, 2016 | Lincoln 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

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

He is telling me its called gemcode


This device is the Generic Electronic Module (GEM) and can be accessed by removing the radio.

You can take out the radio with a pair of special tools that fit into the four small holes you will find on the face of the radio unit. Or, if you take out the two screws at the bottom of the whole dash facia (the black framing around the radio, A/C controls and two top A/C vents, you can carefully remove the entire unit. Behind this facia are the connections to various electronic controls (depending on the options your Explorer has). Behind this radio and facia, look behind and to the left (driver's side) and you will see a small black box (cigarette size) with wires connecting to it. It can be removed by simply sliding the unit up and off its bracket. No screws are holding the GEM to the inside dash. Be sure you have disconnected the battery before attempting any repair or removal for your safety.

Theres two bolts on the top of the back which removes the two large harnesses, also there is 3 small harnesses on the drivers side of the fusse block. You also can remove all the relays to help with clearance issues.. Its in there tight.. Might have to push a little.

The GEM module can be found on eBay for a very reasonable price, around US$ 150.00 more or less. They are brand new with stickers and all still in place juust overstocked items. Just type in GEM module in the search reference of eBay

Also, keep in mind that when replacing the GEM module in a Ford, is it necessary to "Program" or Re-program that unit, can't a direct swap out be left at just that, without doing this previouslly.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jan 25, 2012 | 2006 Ford F-150

1 Answer

What is a gemcode


This device is the Generic Electronic Module (GEM) and can be accessed by removing the radio.

You can take out the radio with a pair of special tools that fit into the four small holes you will find on the face of the radio unit. Or, if you take out the two screws at the bottom of the whole dash facia (the black framing around the radio, A/C controls and two top A/C vents, you can carefully remove the entire unit. Behind this facia are the connections to various electronic controls (depending on the options your Explorer has). Behind this radio and facia, look behind and to the left (driver's side) and you will see a small black box (cigarette size) with wires connecting to it. It can be removed by simply sliding the unit up and off its bracket. No screws are holding the GEM to the inside dash. Be sure you have disconnected the battery before attempting any repair or removal for your safety.

Theres two bolts on the top of the back which removes the two large harnesses, also there is 3 small harnesses on the drivers side of the fusse block. You also can remove all the relays to help with clearance issues.. Its in there tight.. Might have to push a little.

The GEM module can be found on eBay for a very reasonable price, around US$ 150.00 more or less. They are brand new with stickers and all still in place juust overstocked items. Just type in GEM module in the search reference of eBay

Also, keep in mind that when replacing the GEM module in a Ford, is it necessary to "Program" or Re-program that unit, can't a direct swap out be left at just that, without doing this previouslly.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jan 25, 2012 | 1997 Ford F150 Regular Cab

1 Answer

We have a 2001 Ford Escape with a small problem. The remote key fob locks the doors and unlocks the doors but the lights don't flash anymore when you lock the door. The horn also won't honk after hitting...


I think you need to reprogram the module, you deleted the horn chirp and light flash confirmation. he dealer can reprogram for you.


Customer Preference Items NOTE: If using the WDS, select Module Configuration and Programming, then follow the screen prompts.
NOTE: Make sure module is listed as supporting customer preference items and supports the specific item to be configured in the Module Configuration Index in this section.
  1. Select Service Bay Functions on the diagnostic tool.
  1. Select the module that contains the customer preference item to be programmed. Refer to the Module Configuration Index in this section.
  1. Select Customer Preference Items on the diagnostic tool.
  1. Select Module Option Content.
  1. Select the item to be enabled or disabled.
  1. Enable or disable the item as necessary to reflect the customer preference.
------------------------------------------------------------------------

----------------------------------------------------------------------------
Principles of Operation
Power Door Locks
The generic electronic module (GEM) controls the power door lock and keyless entry system. Lock and unlock operation is achieved through the use of internal relays in the GEM. The relays are all door lock, all door unlock and driver door unlock. The normal path of the relays is to ground.
Pressing the door lock control switch to lock or unlock sends a ground signal to the GEM. The same GEM pin is used for unlock and lock input. The unlock signal is a direct connection to ground. The lock signal is altered by an internal resistor in the door lock control switch. This varied resistance identifies lock or unlock command to the GEM.
The door locks can also be controlled by the door key cylinder switches. For the liftgate door lock switch, turning the key to lock or unlock sends a ground signal to the GEM. The GEM will then ground the all door lock or all door unlock relay supplying voltage to the actuators. Turning the driver door key cylinder to the lock position sends a ground signal to the GEM. The GEM will then ground the all door lock relay supplying voltage to the actuators. Turning the driver door key cylinder to unlock sends a ground signal to GEM. The GEM will ground the driver door unlock relay and supply voltage to only the driver door actuator. If a second unlock ground is received within three seconds of the first, the GEM will ground the all door unlock relay supplying voltage to the passenger door actuators (if 2-stage unlock is equipped).
Keyless Entry
The keyless entry remote transmitter sends a signal that is received by the GEM internal antenna. Depending on the signal received, the GEM module will ground the appropriate internal relay and lock all doors or unlock the driver door. If the unlock signal is received again within three seconds of the first unlock, the GEM will ground the internal all door unlock relay unlocking all doors. The lock and unlock relay output to the actuators is controlled by the GEM, the same as power door lock operation from the control switch.
If the signal received is for the panic button, the GEM will cycle ground to the park lamp relay coil and horn relay coil. The park lamps and horn will continue to cycle until the panic button is pressed again or the ignition switch is turned to the RUN position, or after the timer expires.

Dec 17, 2009 | 2005 Ford Escape

1 Answer

Need to know what fuse goes where


I am not sure if this right and there should be diagram on the back of cover.


1 5A Power Mirror Switch

2 10A Daytime Running Lights (DRL),
Back-up Lamps, Transmission,
Passenger Air Bag Deactivation
Switch, Blower Motor Relay

3 7.5A Right Stop/Turn Trailer Tow
Connector

4 — Not Used

5 15A 4x4 Control Module

6 — Not Used

7 7.5A Left Stop/Turn Trailer Tow
Connector

8 — Not Used

9 7.5A Brake Pedal Position Switch

10 7.5A Speed Control Servo/Amplifier
Assembly, Generic Electronic
Module (GEM), Shift Lock
Actuator, Turn Signals

11 7.5A Instrument Cluster, 4x4, Main
Light Switch, Truck Central
Security Module (TCSM)

12 — Not Used

13 20A Brake Pedal Position Switch

14 10A or Not Used 10A: If equipped with Anti-Lock
Brake System (ABS) Control
Module

15 — Not Used

16 30A Windshield Wiper Motor, Wiper
Hi-Lo Relay, Wiper Run/Park
Relay

17 20A Cigar Lighter, Data Link
Connector (DLC)

18 — Not Used

19 25A PCM Power Diode, Ignition, PATS

20 7.5A Generic Electronic Module
(GEM), Radio

21 15A Flasher (Hazard)

22 20A Auxiliary Power Socket

23 — Not Used

24 7.5A Clutch Pedal Position (CPP)
switch, Starter Interrupt Relay

25 — Not Used

26 10A Battery Saver Relay, Auxillary
Relay Box, Restraint Central
Module (RCM), Generic Electroic
Module (GEM), Instrument
Cluster

27 — Not Used

28 7.5A Generic Electronic Module
(GEM), Radio

29 20A Radio

30 — Not Used

31 — Not Used

32 — Not Used

33 15A Headlamps, Daytime Running
Lamps (DRL) Module, Instrument
Cluster

34 — Not Used

35 15A or Not Used 15A: Horn Relay if Not Equipped
with Truck Central Security
Module

36 — Not Used

Jun 02, 2009 | 2001 Ford Ranger Regular Cab

1 Answer

Time delay relay for interior lights


I would suspect you have a bad door switch on one of the doors or liftgate. They are usually plunger switches. Try pusing them in one at a time and see f the lights go out. Hold it in long enough to account for the time delay.

please rate if this helps you.

---------
  • The Courtesy Lamps Stay On Continuously
  • Circuitry.
  • GEM/CTM.
  • Ignition switch.
  • Interior lamp relay.
  • Dimmer module.
  • Door ajar switch.
  • DTC B1322.
  • DTC B1330.
  • DTC B1334.
  • DTC B1338.
  • DTC B1371.
  • DTC B1574.
  • DTC B1610.


------------------------------------
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 New Generation STAR (NGS) Tester.
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 under its control and reports a concern in the form of a diagnostic trouble code (DTC). A DTC can be retrieved with NGS Tester through the communication link.
NGS Tester is a menu-driven tester that allows the user to run specific tests. NGS Tester can isolate faults in the GEM/CTM subsystems through a symptom-driven diagnostic procedure. Connecting NGS Tester 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, it is advised to 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 performs 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.
The normal operation of the GEM/CTM can detect errors. An integral part of the normal GEM/CTM operation is the 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 in 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.

Apr 28, 2009 | 1998 Ford Explorer

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