2002 Explorer Power Window System Diagnosis

2002 Ford Truck Explorer 4WD V6-4.0L VIN E

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Windows: Testing and Inspection Principles of Operation PRINCIPLES OF OPERATION GEM Controlled Systems Vehicles manufactured in the first part of 2002 use a GEM to control the power supply to the rear defrost grid and power window system. These vehicles will be referred to as "early build". ICM Controlled Systems Vehicles manufactured later in 2002 use the instrument cluster module (ICM) to control the power supply to the rear defrost grid and power window system. These vehicles will be referred to as "late build". Power Window Operation The power window system operates under the control of the accessory delay relay. For early build vehicles, the GEM will energize the relay to provide power to the power window system. For late build vehicles, the ICM will energize the relay to provide power to the power window system.

Power Window Control The power window system can be operated from the left front or from the power window switch located on each door panel. The left front (master) power window switch has two modes of operation for the left front power window, manual and auto. All other windows operate in the manual mode only. Manual mode will move the window downward until the switch is released. The left front power window will operate in the manual mode when the left front power window switch is pressed to the first detent position. Auto mode provides the one-touch down (OTD) feature for the left front power window. The OTD function allows the left front power window to be completely lowered when the master window adjust switch is pressed to the second detent position and then released. The power window system will only operate if: - The ignition is in the RUN or ACC position or - The accessory delay feature is in the active mode.

Accessory Delay Power For early build vehicles, the GEM controls the accessory delay feature and power supply to the power windows through the accessory delay relay. For late build vehicles, the ICM controls the accessory delay feature and power supply to the power windows through the accessory delay relay. The relay is activated by applying a ground signal directly to one side of the coil and deactivated by removing the signal.

Heated Backlite and Mirror Timer For early build vehicles, when the rear window defrost switch is pressed, a 10 minute timer is started and the GEM energizes the heated backlite relay to provide battery voltage to the heated backlite grid and heated outside rear view mirror (if equipped). For late build vehicles, when the rear window defrost switch is pressed, a 10 minute timer is started and the ICM energizes the heated backlite relay to provide battery voltage to the heated backlite grid and heated outside rear view mirror (if equipped).The rear window grid wires heat up to defrost the rear window or melt accumulated snow or ice.

GEM Controlled Functions The Generic Electronic Module (GEM) is used in early build vehicles. It receives input information and performs an output to a majority of electronically controlled features of the vehicle. The GEM constantly monitors these systems and reports a concern in the form of a Diagnostic Trouble Code (DTC). The DTC can be retrieved with a diagnostic tool through the vehicle Data Link Connector (DLC). The GEM control system has two modes of operation, the normal operating mode and tester-dependent diagnostics mode. The normal operating mode of the GEM detect errors and changes the GEM control strategy. There is no warning lamp for the GEM; therefore, a DTC concern will direct you to the GEM diagnostic procedures. The GEM can only detect open circuit/short to GND faults when energizing a load, and short to battery faults when attempting to energize a load.

ICM Controlled Functions The instrument cluster module (ICM) is used in late build vehicles. It controls the rear window defrost grid and heated mirrors (if equipped) by controlling the state of the rear window defrost/mirror relay. When the rear window defrost switch is pressed, the ICM will activate the heated grid relay. When the heated grid relay is active, both the rear window defrost grid and heated mirror elements will be energized. The ICM will deactivate the heated grid relay when one of the following conditions is met: - The rear window defrost switch is pressed when the feature is active. - Ignition switch state is changed from RUN to OFF/LOCK. - The 10 minute timing function is completed. Feature inputs:

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Ignition switch RUN position (12V on both RUN and RUN/ACC inputs) Rear window defrost switch (momentary contact to ground when the switch is pressed)

Feature outputs: - Rear window defrost relay control (grounded when activated, open circuit when deactivated)

Inspection and Verification INSPECTION AND VERIFICATION 1. Verify a power window or rear window defrost system concern by operating the system in question. 2. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart 3. Inspect the central and battery junction box for blown fuses. 4. If the concern remains after the inspection, connect the diagnostic tool to the 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. 5. Perform the DATA LINK DIAGNOSTIC TEST. If the diagnostic tool responds with: - SCP +, SCP - or UBP circuits fault = ALL ECUS NO RESP/NOT EQUIP, refer to Information Bus (Module Communications Network). - NO RESP/NOT EQUIP for GEM, refer to Body Control Systems (Multifunction Electronic Control Module). - NO RESP/NOT EQUIP for ICM, refer to Instrument Panel, Gauges and Warning Indicators. - 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. 6. If the DTCs retrieved are related to the concern, go to the GEM/CTM or ICM Diagnostic Trouble Code (DTC) Index to continue diagnostics. See: Trouble Code Descriptions 7. If no DTCs related to the concern are retrieved, GO to Symptom Chart to continue diagnostics. See: Diagnosis By Symptom

2002 Ford Truck Explorer 4WD V6-4.0L VIN E

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B1302-B1349

Test A: All Power Windows Are Inoperative PINPOINT TEST A: ALL POWER WINDOWS ARE INOPERATIVE

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A6 CAUTION: - Electronic modules are sensitive to electrostatic discharges. If exposed to these charges, damage can result. - Disconnect the battery before removing and installing the generic electronic module (GEM) or its connectors. Failure to follow this caution will result in the GEM storing many erroneous DTCs and possibly exhibiting erratic operation after installation. - Disconnect the battery before removing and installing the instrument cluster module (ICM) or its connectors. Failure to follow this caution will result in the ICM storing many erroneous DTCs and possibly exhibiting erratic operation after installation. - Be careful when probing the I/P fuse panel, power distribution box or any connectors. Damage will result to the connector receptacle if the probe or terminal being used is too large. NOTE: - If continuous diagnostic trouble codes (DTCs) are recorded and the symptom is not present when carrying out the pinpoint tests, an intermittent concern may be the cause. Always check for loose connections and corroded terminals. - Complete the entire pinpoint test related to the symptom before installing a new GEM or ICM.

Test B: Single Power Window Is Inoperative - Driver Side Front Power Window PINPOINT TEST B: SINGLE POWER WINDOW IS INOPERATIVE - DRIVER SIDE FRONT POWER WINDOW

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B5

Test C: Single Power Window Is Inoperative - Passenger Side Front Power Window PINPOINT TEST C: SINGLE POWER WINDOW IS INOPERATIVE - PASSENGER SIDE FRONT POWER WINDOW

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C5

Test D: Single Power Window Is Inoperative - Left Rear Power Window PINPOINT TEST D: SINGLE POWER WINDOW IS INOPERATIVE - LEFT REAR POWER WINDOW

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D5

Test E: Single Power Window Is Inoperative - Right Rear Power Window PINPOINT TEST E: SINGLE POWER WINDOW IS INOPERATIVE - RIGHT REAR POWER WINDOW

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Test F: The Back Window Defroster Will Not Defrost PINPOINT TEST F: THE BACK WINDOW DEFROSTER WILL NOT DEFROST

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Test G: The Back Window Defroster Will Not Shut Off Automatically PINPOINT TEST G: THE BACK WINDOW DEFROSTER WILL NOT SHUT OFF AUTOMATICALLY

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Symptom Chart (Part 1)

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Symptom Chart (Part 2)

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