Diagnostic Instructions
| • | 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. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Door Module B+ | 1, 3 | 1, 3 | -- | -- |
Driver Window Motor B+ | 1, 2, 3, 4 | 1 | -- | -- |
LR Window Motor B+ | 1, 2, 3, 4 | 3 | -- | -- |
Passenger Door Module B+ | 2, 4 | 2, 4 | -- | -- |
Front Passenger Window Motor B+ | 1, 2, 3, 4 | 2 | -- | -- |
RR Window Motor B+ | 1, 2, 3, 4 | 4 | -- | -- |
Driver Window Motor Serial Data | 1 | 1 | 1 | -- |
Front Passenger Window Motor Serial Data | 2 | 2 | 2 | -- |
LR Window Motor Serial Data | 3 | 3 | 3 | -- |
RR Window Motor Serial Data | 4 | 4 | 4 | -- |
Power Window Driver Switch Voltage Reference | 3 | 3 | 3 | -- |
Power Window Passenger Switch Voltage Reference | 4 | 4 | 4 | -- |
Power Window Switch Left Rear Signal | 3 | 3 | 3 | -- |
Power Window Switch Right Rear Signal | 4 | 4 | 4 | -- |
Driver Door Module Ground | -- | 1, 3 | 1, 3 | -- |
Passenger Door Module Ground | -- | 2, 4 | 2, 4 | -- |
Driver Window Motor Ground | -- | 2 | 2 | -- |
Front Passenger Window Motor Ground | -- | 2 | 2 | -- |
LR Window Motor Ground | -- | 3 | 3 | -- |
RR Window Motor Ground | -- | 4 | 4 | -- |
1. Driver Window Malfunction 2. Passenger Window Malfunction 3. Left Rear Window Malfunction 4. Right Rear Window Malfunction | ||||
Circuit/System Description
The front and rear power windows are controlled by the driver door module (DDM) and front passenger door module (PDM). The DDM and PDM each contain power window switches that are integrated into the module. The DDM contains the master power window switch that controls all power window operations. The DDM supplies the left rear power window switch with a 12-volt reference and signal circuit. The power window switch contained in the PDM controls the front passenger window operation only. The PDM supplies the right rear power window switch with a 12-volt reference and signal circuit.
When the driver power window switch is activated to a desired position, the DDM examines the request and checks for messages from other vehicle control modules prohibiting window movement. If no prohibitive messages have been received, the DDM will send a LIN serial data message to the driver door window motor to move the window to the desired position.
When the DDM receives a request to operate one of the right side passenger windows from the driver master control, a GMLAN serial data message is sent to the PDM. The PDM examines the request and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the PDM will send a LIN serial data message to the appropriate window motor to move the window as requested.
The DDM and PDM supply their respective rear power window switches with a 12-volt reference and signal circuit. The rear power window switches contain separate resistors for each switch position. When a rear power window switch is activated, the associated door control module interprets the signal and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the door control module sends a LIN serial data message to the appropriate power window motor commanding the requested window position.
Reference Information
Schematic Reference
Connector End View Reference
Power Door Systems Connector End Views
Description and Operation
Power Windows Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
- Ignition ON, observe the scan tool parameters while pressing and pulling the appropriate front door window switch, the appropriate door should perform the UP/DOWN function.
- Observe the operation of the appropriate rear door window while pressing and pulling the appropriate rear door switch, the appropriate rear door window should perform the UP/DOWN function.
| ⇒ | If the scan tool Driver Window Switch parameters do not change while pressing and pulling a power window switch on the driver master control, refer to Driver Door Module Malfunction. |
| ⇒ | If the scan tool Passenger Window Switch parameters do not change while pressing and pulling the front passenger power window switch, refer to Passenger Door Module Malfunction. |
| ⇒ | If the scan tool Window Motor Status is always OFF or Open/Short, refer to Window Motor Malfunction. |
| ⇒ | If the appropriate rear door window does not go UP or DOWN as commanded, refer to Rear Window Switch Malfunction. |
Circuit/System Testing
Driver Door Module Malfunction
- Ignition ON, observe the appropriate scan tool Driver Window Switch parameters while pressing and pulling the appropriate power window switch on the driver master control. The reading should change between OFF/UP/DOWN/EXPRESS UP/EXPRESS DOWN.
- Ignition ON, observe the scan tool Window Lockout Switch parameter while pressing the window lockout switch on the driver master control. The reading should change between ON and OFF.
| ⇒ | If the scan tool Driver Window Switch parameter is always OFF, replace the DDM. |
| ⇒ | If the scan tool Driver Window Switch parameter is always UP, DOWN. EXPRESS UP, or EXPRESS DOWN, replace the DDM. |
| ⇒ | If the scan tool Window Lockout Switch parameter is always OFF, replace the DDM. |
| ⇒ | If the scan tool Window Lockout Switch parameter is always ON, replace the DDM. |
Passenger Door Module Malfunction
Ignition ON, observe the scan tool Passenger Window Switch parameters while pressing and pulling the power window switch. The reading should change between OFF/UP/DOWN/EXPRESS UP/EXPRESS DOWN.
| ⇒ | If the scan tool Passenger Window Switch parameter is always OFF, replace the PDM. |
| ⇒ | If the scan tool Passenger Window Switch parameter is always UP, DOWN. EXPRESS UP, or EXPRESS DOWN, replace the PDM. |
Window Motor Malfunction
- Ignition OFF, disconnect the harness connector at the appropriate Window Motor.
- Ignition OFF, test for less than 1.5 ohms of resistance between the power window motor ground circuit terminal 4 and ground.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
- Test for 6.0-7.0 volts between the local interconnect network terminal 6 and ground.
- Ignition ON, reconnect the harness connector at the appropriate power window motor. Observe the scan tool Window Motor Fault Status while pressing and pulling the appropriate window switch, the status should read No Fault.
| ⇒ | 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 circuit test normal and the PWR/WNDW circuit breaker is open, replace the appropriate Window Motor. |
| ⇒ | If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the appropriate door module. |
| ⇒ | If greater than the specified range, test the circuit for a short to B+. If the circuit tests normal replace the appropriate door module. |
| ⇒ | If the Status reads Motor Fault, Hall Fault, Memory Fault, LIN Fault, Anti-Trap Fault or Thermo Active, replace the appropriate power window motor. |
Rear Window Switch Malfunction
- Ignition OFF, disconnect the harness connector at the appropriate rear door window switch.
- Test for 8.0K-9.0K ohms of resistance between the signal terminal 4 and the voltage reference terminal 3 with the switch in the inactive position.
- Test for 2.75K-3.75K ohms of resistance between the signal terminal 4 and the voltage reference terminal 3 with the switch in the Auto DOWN position.
- Test for 5.25K-6.25K ohms of resistance between the signal terminal 4 and the voltage reference terminal 3 with the switch in the DOWN position.
- Test for 1.9K-2.9K ohms of resistance between the signal terminal 4 and the voltage reference terminal 3 with the switch in the UP position.
- Ignition ON, test for B+ voltage between the voltage reference circuit terminal 3 and ground.
| ⇒ | If not the specified value, replace the appropriate rear door window switch. |
| ⇒ | If not the specified value, replace the appropriate rear door window switch. |
| ⇒ | If not the specified value, replace the appropriate rear door window switch. |
| ⇒ | If not the specified value, replace the appropriate rear door window switch. |
| ⇒ | If less than the specified voltage, test the power window switch voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate door module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
