Left Front Power Window Inoperative

LEFT FRONT POWER WINDOW INOPERATIVE

Left Front Power Window Inoperative:

POSSIBLE CAUSES
- Left front power window switch
- Left power window switch sense circuit
- Ground circuit
- Left front power window motor
- Left front power window driver circuit
- Body control module

DIAGNOSTIC TEST

1. CHECK THE LEFT POWER WINDOW SWITCH




Turn the ignition on.
Push and hold the Left Power Window Switch to roll down the window.
While holding the Left Front Power Window Switch down and then up, measure the voltage of the Left Power Window Switch Sense circuit by backprobing the Left Front Power Window Switch harness connector.

Q: Is the voltage between 8.0 - 9.0 volts rolling the window down and between 4.0 - 5.0 volts rolling the window up?

YES: Go to 5
NO: Go to 2

2. MEASURE THE VOLTAGE OF THE LEFT POWER WINDOW SWITCH SENSE CIRCUIT




Release the Left Power Window Switch.
Turn the ignition off.
Disconnect the Left Front Power Window Switch harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the Left Power Window Switch Sense circuit at the Left Front Power Window Switch harness connector.

Q: Is the voltage above 10 volts?

YES: Go to 4
NO: Go to 3

3. MEASURE LEFT POWER WINDOW SWITCH SENSE CIRCUIT RESISTANCE




Turn the ignition off.
Disconnect the Body Control Module (BCM) harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Left Power Window Switch Sense circuit from the Left Front Power Window Switch harness connector to the BCM C4 harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Body Control Module. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Repair the Left Power Window Switch Sense circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test

4. MEASURE GROUND CIRCUIT RESISTANCE




Turn the ignition off.
Disconnect the Body Control Module (BCM) harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Ground circuit from the Left Front Power Window Switch harness connector to the BCM C4 harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Left Front Power Window Switch. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Repair the Ground circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test

5. TEST THE LEFT FRONT POWER WINDOW MOTOR




Turn the ignition off.
Disconnect the Body Control Module (BCM) C4 harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Connect a fused jumper wire from cavity 12 of the BCM C4 harness connector to B(+).
Connect a second fused jumper wire to cavity 13 of the BCM harness connector and momentarily connect the jumper to ground.
Note the window movement; if the left front window does not move, reverse the jumper wires at the B(+) and ground connections.

Q: Did the left front window move upward or downward?

YES: Replace the Body Control Module. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Go to 6

6. MEASURE LEFT FRONT POWER WINDOW DRIVER CIRCUITS RESISTANCE




With the ignition off.
Disconnect the Left Front Power Window Motor harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Connect a jumper wire between cavity 1 and cavity 2 of the Left Front Power Window Motor harness connector.
Measure the resistance between cavity 12 and cavity 13 of the BCM C4 harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Left Front Power Window Motor.Perform BODY VERIFICATION TEST. Body Verification Test
NO: Repair the Left Front Power Window Driver circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test