Power Windows Inoperative - All

POWER WINDOWS INOPERATIVE - ALL




DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

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.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the driver power window switch.
2. Ignition ON, verify that a test lamp illuminates between the driver power window switch voltage supply circuit and ground.
- If the test lamp does not illuminate, repair the power window switch voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
3. Verify that a test lamp illuminates between the driver power window switch voltage supply circuit and the driver power window switch ground circuit at the driver power window switch harness connector.
- If the test lamp does not illuminate, repair the driver power window switch ground circuit for a short to voltage or an open/high resistance.
4. If all circuits test normal, test or replace the driver power window switch.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

- Power Window Switch Replacement
- Control Module References for BCM replacement, setup, and programming.