Interior Lighting Ford Explorer Sport Trac I

The interior lighting system consists of the following

1. dome/map lamp-front
2. dome/map lamp-rear
3. cargo lamp (Sport Trac only)
4. ash receptacle lamp
5. glove compartment lamp
6. overhead console/map lamp (part of overhead console assembly)
7. RH/LH vanity mirror
8. puddle lamps (Sport only)
9. interior lamp switches
10. interior lamp relay
11. dimmer module
12. battery saver relay
13. generic electronic module (GEM)
14. central security module

For overhead console removal and installation, refer to OVERHEAD CONSOLE .

For GEM or central security module removal and installation, refer to GENERIC ELECTRONIC MODULE (GEM) .

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Special Tool(s)

Scheme 1

Principles of Operation

All vehicles are equipped with the generic electronic module (GEM).

A wake-up command is sent when

1. any door becomes ajar or is opened or closed.
2. the GEM receives an illuminated entry request.
3. the key is inserted into or removed from the ignition.
4. the ignition switch is turned from OFF to RUN.
5. the ignition switch is turned from OFF to ACC.
6. a wake-up request is received from the central security module.

The GEM illuminates the interior courtesy lamps when any door is set ajar or opened. The following are inputs used for controlling the courtesy lamps

1. all door ajar switches (including liftgate and liftgate glass).
2. illuminated entry request (central security module).
3. vehicle speed signal input (GEM only).

All interior courtesy lamps are turned off when any of the following occurs

1. all the doors are closed and the illuminated entry feature is not active.
2. the ignition switch is turned to RUN.
3. vehicle speed is over 8 km/h (5 mph) (GEM only).
4. a power door lock command is received before the five seconds have elapsed for two-step unlock.

The GEM controls the interior lamps illuminated entry function with the interior lamp relay. The relay is activated when the GEM applies ground to the relay coil, and is deactivated by removing the ground.

The panel dimmer switch controls the interior lamps by supplying power to the interior lights. The battery saver relay supplies power to the panel dimmer switch. When the battery saver function is not active, power will not be supplied to the dimmer switch circuit and the panel dimmer switch will not turn on the interior lighting.

The central security module sends a signal to the GEM on the illuminated entry request circuit to indicate a request to turn the illuminated entry feature ON or OFF. This is normally at 12 volts supplied by the GEM. The central security module shorts this circuit to ground with a pulse of either of the following lengths

1. 200 ms pulse from the central security module receiver assembly request illuminated entry ON.
2. 300 ms pulse from the central security module receiver assembly request illuminated entry OFF.

For additional central security module information, refer to VEHICLE SECURITY MODULE .

The illuminated entry feature is another feature which activates the interior lamps. This feature operates as follows

The GEM illuminates the interior lamps when an unlock signal is received from the central security module. The illuminated entry feature will be canceled when any of the following conditions are met

1. 25 seconds have elapsed since the illuminated entry feature was activated and the interior lamp control is not activated.
2. the GEM receives a request from the central security module (remote transmitter lock button pressed) and the courtesy lamp control is not activated.
3. the ignition is in the RUN or START position and the interior lamp control is not activated.

The illuminated entry inputs and the ignition switch in the key-in, ACC and RUN positions, and the illuminated entry request (central security module).

There are no GEM sleep mode outputs; all circuits are deactivated during sleep mode.

If a change in any of the above inputs occurs while the GEM is asleep, the GEM will wake up and monitor all of its inputs, and will have the ability to activate any of its outputs.

Inspection and Verification

1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical and electrical damage. Visual Inspection Chart VISUAL INSPECTION CHART Mechanical Electrical Door ajar switch(es) Battery junction box (BJB) fuse 1 (60A) Central junction box (CJB) fuses: 25 (7.5A) 26 (10A) 10 (7.5A) Interior map lamps Circuitry Generic electronic module (GEM)
3. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle: check that the program card is correctly installed. check the connections to the vehicle. check the ignition switch position.
4. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.
5. Carry out the DATA LINK DIAGNOSTICS test. If the diagnostic tool responds with: CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to «MODULE COMMUNICATIONS NETWORK»(/ford/explorer-sport-trac/i-2000-2005/remont/communication-devices/#module-communications-network) . NO RESP/NOT EQUIP for generic electronic module(GEM), REFER to «MULTIFUNCTION ELECTRONIC CONTROL MODULES»(/ford/explorer-sport-trac/i-2000-2005/remont/communication-devices/#multifunction-electronic-control-modules) . SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the GEM module.
6. If the DTCs retrieved are related to the concern, go to the «GEM DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(/ford/explorer-sport-trac/i-2000-2005/remont/interiorillumination-lights/#interior-lighting__gem-diagnostic-trouble-code-dtc-index) to continue diagnostics.
7. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.
8. If the DTCs are retrieved that are not found in the following GEM Diagnostic Trouble Code (DTC) Index, refer to the master «GEM DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(/ford/explorer-sport-trac/i-2000-2005/remont/interiorillumination-lights/#interior-lighting__gem-diagnostic-trouble-code-dtc-index) in «MULTIFUNCTION ELECTRONIC CONTROL MODULES»(/ford/explorer-sport-trac/i-2000-2005/remont/communication-devices/#multifunction-electronic-control-modules) .

GEM Diagnostic Trouble Code (DTC) Index

GEM DIAGNOSTIC TROUBLE CODE (DTC) INDEX

Symptom Chart

PROBLEM SYMPTOM CHART

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1. Disconnect the battery. .
2. Remove the lamp lens. Use a thin-bladed tool to carefully pry the dome lamp lens out. Install a new bulb if necessary.
3. Remove the lamp. Remove the screws. Lower the lamp, disconnect the electrical connector and remove the lamp from the vehicle.
4. To install, reverse the removal procedure.

See also:
• OVERHEAD CONSOLE
• GENERIC ELECTRONIC MODULE (GEM)
• MODULE COMMUNICATIONS NETWORK
• GEM DIAGNOSTIC TROUBLE CODE (DTC) INDEX
• PINPOINT TEST A: THE INTERIOR LAMPS ARE INOPERATIVE