Circuit/System Verification
- Ignition ON.
- Verify the M74D Window Motor-Driver functions while commanding the Driver Window Motor Up and Down with a scan tool.
- If the M74D Window Motor-Driver does not move UP and DOWN as commanded
Refer to Circuit/System Testing - Driver Window Motor Malfunction .
- If the M74D Window Motor-Driver moves UP and DOWN as commanded
- If the M74D Window Motor-Driver does not move UP and DOWN as commanded
- Verify the M74D Window Motor-Driver moves while commanding the window UP and DOWN with the S79D Window Switch-Driver.
- If the M74D Window Motor-Driver does not move UP and DOWN as commanded
Refer to Circuit/System Testing - Driver Window Switch Malfunction .
- If the M74D Window Motor-Driver moves UP and DOWN as commanded
- If the M74D Window Motor-Driver does not move UP and DOWN as commanded
- Verify the M74D Window Motor-Driver performs the express UP and express DOWN functions with the S79D Window Switch-Driver.
- If the driver window does not express UP or express DOWN
Normalize the M74D Window Motor-Driver, refer to Window Motor Programming - Express Function .
- Verify the M74D Window Motor-Driver performs the express UP and express DOWN functions with the S79D Window Switch-Driver
- If the M74D Window Motor-Driver does not express UP or express DOWN
Refer to Circuit/System Testing - Driver Window Switch Malfunction .
- If the M74D Window Motor-Driver performs the express UP and express DOWN functions
- If the driver window does not express UP or express DOWN
- Verify the M74P Window Motor-Passenger performs the UP and DOWN functions at both the S79D Window Switch-Driver and S79P Window Switch-Passenger.
- If the M74P Window Motor-Passenger is inoperative from both the S79D Window Switch-Driver and S79P Window Switch-Passenger
Refer to Circuit/System Testing - Passenger Window Inoperative From Both Switches .
- If the M74P Window Motor-Passenger is inoperative from the S79P Window Switch-Passenger only
Refer to Circuit/System Testing - Passenger Window Inoperative From A Single Switch .
- If the M74P Window Motor-Passenger is inoperative from the S79D Window Switch-Driver only
Refer to Circuit/System Testing - Passenger Window Inoperative From A Single Switch .
- If the M74P Window Motor-Passenger performs the UP and DOWN functions at both S79D Window Switch-Driver and S79P Window Switch-Passenger
- If the M74P Window Motor-Passenger is inoperative from both the S79D Window Switch-Driver and S79P Window Switch-Passenger
- Verify the M74LR Window Motor-Left Rear and M74RR Window Motor-Right Rear performs the UP and DOWN functions at both the S79D Window Switch-Driver and each of the S79 Window Switch-Rear.
- If a M74 Window Motor-Rear is inoperative from both the S79D Window Switch-Driver and S79 Window Switch-Rear
Refer to Circuit/System Testing - Rear Window Inoperative From Both Switches
- If a M74 Window Motor-Rear is inoperative from the S79 Window Switch-Rear only
Refer to Circuit/System Testing - Rear Window Switch Inoperative
- If a M74 Window Motor-Rear is inoperative from the S79D Window Switch-Driver only
Test or replace the S79D Window Switch-Driver.
- If the M74 Window Motor-Rear performs the UP and DOWN functions at both the S79D Window Switch-Driver and the S79 Window Switch-Rear
- If a M74 Window Motor-Rear is inoperative from both the S79D Window Switch-Driver and S79 Window Switch-Rear
- Lock out the rear window switches by pressing the lockout switch on the S79D Window Switch-Driver.
- Verify the M74LR Window Motor-Left Rear and M74RR Window Motor-Right Rear is inoperative at both of the S79 Window Switch-Rear.
- If both M74 Window Motor-Rear continue to function from the S79 Window Switch-Rear
Refer to Circuit/System Testing - Rear Window Lockout Inoperative
- If both M74 Window Motor-Rear are inoperative from the S79 Window Switch-Rear
- If both M74 Window Motor-Rear continue to function from the S79 Window Switch-Rear
- All OK.