Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Power Window Switch Ignition | 1 | 2 | -- | -- |
Passenger Power Window Switch Ignition | 1 | 3 | -- | -- |
Driver Power Window Motor Control | 2 | 2 | 2 | -- |
Passenger Power Window Motor Control | 3 | 3 | 3 | -- |
Passenger Power Window Master Switch Up Control | 3 | 3 | -- | -- |
Passenger Power Window Master Switch Down Control | 3 | 3 | -- | -- |
Driver Power Window Switch Ground | -- | 1 | 1 | -- |
Passenger Power Window Switch Ground | -- | 1 | 1 | -- |
1. Power Windows Inoperative - All 2. Power Window Inoperative - Driver 3. Power Window Inoperative - Passenger | ||||
Circuit/System Description
Battery voltage is applied at all times to the coil and switch terminals of the ACCESSORY relay located in the body control module (BCM). When the ignition is placed in the RUN or ACCESSORY positions, or if retained accessory power (RAP) is active, the BCM grounds the accessory relay coil. This energizes the accessory relay, closing the switch side contacts and provides battery voltage to the WINDOWS fuse through to the driver and passenger power window switches. The power window motor control circuits are connected to ground through the normally closed up and down switch contacts of the power window switches. When a power window switch is placed in the down position, the power window motor down control circuit is switched to 12 volts. The power window motor up control circuit serves as ground and the window travels down. By placing the power window switch in the up position, the polarity of the power window motor is reversed and the window travels up.
Reference Information
Schematic Reference
Connector End View Reference
Power Door Systems Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the driver power window switch.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit and ground.
- Ignition OFF, reconnect the driver power window switch.
- Disconnect the driver power window motor.
- Connect a test lamp between the driver power window motor up and down control circuits at the driver power window motor harness connector.
- Ignition ON, activate the driver power window switch to the up and down positions. The test lamp should illuminate as the driver power window switch is cycled between up and down.
- If all circuits test normal, test or replace the driver power window motor.
| ⇒ | If the test lamp does not illuminate, repair the ignition circuit for an open/high resistance. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp does not illuminate, repair the driver power window motor up and down control circuits for an open/high resistance. If the circuits test normal, test or replace the driver power window switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming. |
