• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Driver Window Switch B+ | 1 | 1 | -- | -- |
Left Front Window Motor B+ | 1 | 1 | -- | B3205 4B |
Passenger Window Switch B+ | 1 | 1 | -- | -- |
Right Front Window Motor B+ | 1 | 1 | -- | B3210 4B |
Left Rear Window Motor B+ | 2 | 2 | -- | B3215 42 |
Left Rear Window Switch B+ | 2 | 2 | -- | -- |
Right Rear Window Motor B+ | 2 | 2 | -- | B3220 4B |
Right Rear Window Switch B+ | 2 | 2 | -- | -- |
Left Front Window Motor Control | 1 | 1 | 1 | -- |
Left Rear Window Motor Control | 2 | 2 | 2 | -- |
Right Front Window Motor Control | 1 | 1 | 1 | -- |
Right Rear Window Motor Control | 2 | 2 | 2 | -- |
Left Front Window Motor Ground | -- | 1 | 1 | B3205 B4 |
Left Rear Window Motor Ground | -- | 2 | 1 | B3215 4B |
Right Front Window Motor Ground | -- | 1 | 1 | B3210 4B |
Right Rear Window Motor Ground | -- | 2 | 2 | B3220 4B |
Driver Window Switch Ground | -- | 1 | 1 | -- |
Left Rear Window Switch Ground | -- | 2 | 2 | -- |
Passenger Window Switch Ground | -- | 1 | 1 | -- |
Right Rear Window Switch Ground | -- | 2 | 2 | -- |
1. Front Window Malfunction 2. Rear Window Malfunction |
The BCM monitors, receives and transmits serial data to each of the doors switches and window motors. When a window switch has been activated on the driver window switch, a signal is sent to the BCM which sends a signal to the appropriate window motor and the window motor will move in the direction commanded.
• | Battery voltage must be between 9-16 volts. |
• | The ignition switch is in the ON position |
The BCM detects a fault on a window motor control circuit.
An internal malfunction or a momentary voltage spike has been detected by the BCM in the power window motor while commanding the window UP or DOWN.
A not normalized/programmed door power window motor.
The window motor experiences a loss of voltage in the B+ circuit or an open/high resistance in the serial data circuit.
The affected power window will malfunction.
• | The DTC will be current for as long as the fault is present. |
• | The DTC will change from current to history when the fault is no longer present. |
• | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
If the DTC is current, the appropriate window motor must be replaced before the DTC can be cleared.
The affected power window motor must be programmed before the DTC can be cleared.
The affected power window motor must be calibrated before the DTC can be cleared.
Power Windows Description and Operation
Control Module References for scan tool information
Ignition ON, observe the operation of each power window while commanding each window UP and DOWN with a scan tool. Each power window should go UP and DOWN command.
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the S79 window switch. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the S79 window switch. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the S79 window switch. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the S79 window switch. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the S79 window switch. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the S79 window switch. |
⇒ | If the window does not perform as specified, replace the M74 window motor. |
Ignition ON, command the appropriate power window DOWN and UP with a scan tool. The power window should go DOWN and UP as commanded.
⇒ | If the DTC is current and the power window is inoperative, replace the M74 window motor. |
⇒ | If the DTC is history and the power window performs the UP and DOWN functions, clear the DTC. |
Reprogram the appropriate M74 window motor with a scan tool and operate the power window within the conditions for running the DTC, verify the DTC does not reset.
⇒ | If the DTC resets, replace the M74 window motor. |
⇒ | If the DTC resets, replace the M74 window motor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.