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Ford Explorer 2003 - M2 CHECK THE ICM OUTPUT; M3 CHECK THE HEATED BACKLIGHT RELAY; M4 CHECK THE REAR WINDOW DEFROST GRID VOLTAGE

Ford Explorer 2003
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Disconnect: Heated Backlight Relay.
Ignition ON.
Measure the voltage between rear window defrost relay socket pin 85 and pin 30 harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to M2.
No
REPAIR the circuit(s). TEST the system for normal
operation.
M2 CHECK THE ICM OUTPUT
Turn ON the rear window defrost.
Measure the voltage between rear window defrost relay socket pin 85 and pin 86 harness side.
Is the voltage greater than 10 volts?
Yes
GO to M3.
No
GO to M6.
M3 CHECK THE HEATED BACKLIGHT RELAY
Carry out the heated backlight relay component test.
Refer to Wiring Diagrams Cell 149 for component testing.
Did the heated backlight relay pass the component test?
Yes
GO to M4.
No
INSTALL a new heated backlight relay. TEST the
system for normal operation.
M4 CHECK THE REAR WINDOW DEFROST GRID VOLTAGE
Connect: Heated Backlight Relay.
Disconnect: Rear Window Defrost Grid Power C402a.
Ignition ON.
Turn rear window defrost on.
Measure the voltage between rear window defrost grid power C402a, circuit 186 (BN/LB) and ground.
Is the voltage greater than 10 volts?
Yes
GO to M5.
No
REPAIR the circuit. TEST the system for normal
operation.
M5 CHECK THE REAR WINDOW DEFROST GRID GROUND
Ignition OFF.
Disconnect: Rear Window Defrost Grid Ground C402b.
Measure the resistance between rear window defrost grid ground C402b, circuit 1205 (BK) and ground.
Is the resistance less than 5 ohms?
Yes
REPAIR the rear window defrost grid or INSTALL a
new liftgate glass. TEST the system for normal
operation.
No
REPAIR the circuit. TEST the system for normal
operation.
M6 CHECK THE REAR WINDOW DEFROST SWITCH
Enter the following diagnostic mode on the scan tool: ICM Rear Window Defrost PID..
Monitor the ICM rear window defrost PID while turning the rear window defrost ON.
Does the PID match the expected state of the rear window defrost?
Yes
GO to M9.
No
GO to M7.
M7 CHECK CIRCUIT 688 (GY/LB) FOR AN OPEN
17
2003 Explorer/Mountaineer Workshop Manual
1/17/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3N/~MUS~LEN/19/S
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