Part 3
1. Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
2. Test for infinite resistance between the signal circuit terminal 7 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the M74D Window Motor-Driver.
• If Inactive
11. Install a 3 A fused jumper wire between the signal circuit terminal 7 and the ground circuit terminal 11.
12. Verify the scan tool Driver Window Main Control Express Switch parameter is Active
• If not Active
1. Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
2. Test for less than 1 V between the signal circuit terminal 7 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the M74D Window Motor-Driver.
• If Active
13. Test or replace the S79D Window Switch-Driver.
Passenger Window Inoperative From Both Switches
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79P Window Switch-Passenger. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the control circuit terminal 3 and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.
• If less than 10 ohms
3. Test for less than 10 ohms between the control circuit terminal 6 and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.
• If less than 10 ohms
4. Connect a test lamp between the control circuit terminal 3 and control circuit terminal 6, ignition ON.
5. Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79D Window Switch-Driver.
• If the test lamp remains OFF during either of the commands
1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for infinite resistance between each control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79D Window Switch-Driver.
• If the test lamp turns ON during each of the commands
6. Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79P Window Switch-Passenger and disconnect the harness connector at the M74P Window Motor-Passenger. It may take up to 2 minutes for all vehicle systems to power down.
7. Test for less than 10 ohms between the control circuit terminal A and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79P Window Switch-Passenger.
• If less than 10 ohms
8. Test for less than 10 ohms between the control circuit terminal B and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79P Window Switch-Passenger.
• If less than 10 ohms
9. Connect a test lamp between the control circuit terminal A and control circuit terminal B, ignition ON.
10. Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79P Window Switch-Passenger.
• If the test lamp remains OFF during either of the commands
1. Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger.
2. Test for infinite resistance between each control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79P Window Switch-Passenger.
• If the test lamp turns ON during each of the commands
11. Test or replace the M74P Window Motor-Passenger.
Passenger Window Inoperative From A Single Switch
1. Ignition OFF, disconnect the harness connector at the appropriate S79P Window Switch-Passenger or S79D Window Switch-Driver, ignition ON
2. Verify a test lamp illuminates between the ignition circuit terminal listed below and ground.
* S79P Window Switch-Passenger - ignition circuit terminal 5
* S79D Window Switch-Driver - ignition circuit terminal 13
• If the test lamp does not illuminate
1. Ignition OFF.
2. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse.
• If the test lamp illuminates
3. Test or replace the S79P Window Switch-Passenger or S79D Window Switch-Driver,.
Rear Window Inoperative From Both Switches
1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver. Ignition ON
2. Verify a test lamp illuminates between the ignition circuit terminal 6 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF.
2. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, refer to Retained Accessory Power Malfunction Retained Accessory Power Malfunction.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
2. Test for infinite resistance between the ignition circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for infinite resistance between the control circuit terminals listed below and ground:
* Control circuit terminal 1
* Control circuit terminal 2
* Control circuit terminal 3
* Control circuit terminal 4
* Control circuit terminal 5
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79D Window Switch-Driver.
• If the test lamp illuminates
3. Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79D Window Switch-Driver and disconnect the harness connector at the appropriate rear S79 Window Switch. It may take up to 2 minutes for all vehicle systems to power down
4. Test for less than 10 ohms between the control circuit terminal 3 and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.
• If less than 10 ohms
5. Test for less than 10 ohms between the control circuit terminal 6 and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.
• If less than 10 ohms
6. Connect a test lamp between the control circuit terminal 3 and control circuit terminal 6, ignition ON.
7. Verify the test lamp turns ON when commanding the UP and DOWN states with the S79D Window Switch-Driver.
• If the test lamp remains OFF during either of the commands
1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for infinite resistance between each control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79D Window Switch-Driver.
• If the test lamp turns ON during each of the commands
8. Ignition OFF and all vehicle systems OFF, connect the harness connector at the rear S79 Window Switch and disconnect the harness connector at the rear M74 Window Motor. It may take up to 2 minutes for all vehicle systems to power down.
9. Test for less than 10 ohms between the control circuit terminal listed below and ground:
* Control terminal A
* Control terminal B
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the rear S79 Window Switch.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the rear S79 window switch.
• If less than 10 ohms
10. Connect a test lamp between the control circuit terminal A and the control circuit terminal B, ignition ON.
11. Verify the test lamp turns ON when commanding the UP and DOWN states with the rear S79 Window Switch.
• If the test lamp remains OFF during either of the commands
1. Ignition OFF, disconnect the harness connector at the rear S79 Window Switch.
2. Test for infinite resistance between each control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the rear S79 Window Switch.
• If the test lamp turns ON during each of the commands
12. Test or replace the rear M74 Window Motor.
Rear Window Lockout Inoperative
1. Ignition OFF, disconnect the harness connector at the appropriate rear S79 Window Switch. Ignition ON
2. Connect a test lamp between the control circuit terminal 5 and ground.
3. Verify the test lamp turns ON and OFF when commanding the rear window lockout ON and OFF with the rear window lockout switch.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79D Window Switch-Driver.
• If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the S79D Window Switch-Driver.
• If the test lamp turns ON and OFF
4. Test or replace the rear S79 Window Switch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the appropriate passenger or rear M74 Window Motor.
2. Install a 20 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M74 Window Motor should perform the UP and DOWN functions.
• If the M74 Window Motor does not perform the UP and DOWN functions
Replace the passenger or rear M74 Window Motor.
• If the M74 Window Motor performs the UP and DOWN functions
3. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Front Side Door Window Regulator Motor Replacement Service and Repair
* Rear Side Door Window Switch Replacement Rear Side Door Window Switch Replacement
* Rear Side Door Window Regulator Replacement (Sedan) Rear Side Door Window Regulator Replacement (Sedan)Rear Side Door Window Regulator Replacement (Hatchback) Rear Side Door Window Regulator Replacement (Hatchback)
* Front Side Door Window Switch Replacement (Left Side) Front Side Door Window Switch Replacement (Left Side)Front Side Door Window Switch Replacement (Right Side) Front Side Door Window Switch Replacement (Right Side)