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
Power window inoperative in the express down function is the result of an internal circuit failure of the driver power window switch.
| ⇒ | Replace the driver power window switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
