Circuit/System Testing

Window Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate S79 window switch.
2. Test for less than 15 Ω between the ground circuit terminal listed below and ground:
   • S79D window switch-driver terminal 1
   • S79P window switch-passenger terminal 1
   • S79LR window switch-left rear terminal 5
   • S79RR window switch-right rear terminal 5
   • If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal listed below and ground:
   • S79D window switch-driver terminal 4
   • S79P window switch-passenger terminal 4
   • S79LR window switch-left rear terminal 8
   • S79RR window switch-right rear terminal 8
   • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Test for 6.5-9V between the LIN circuit terminal listed below and ground.
   • S79D window switch-driver terminal 5
   • S79P window switch-passenger terminal 5
   • S79LR window switch-left rear terminal 1
   • S79RR window switch-right rear terminal 1
   • If greater than the specified range, test the LIN circuit for a short to voltage. If the circuit tests normal, replace the BCM.
   • If less than the specified range, test the LIN circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the S79 window switch.

Window Motor Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate M74 window motor.
2. Test for less than 15 Ω between the control circuit terminal A and ground.
   • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate S79 window switch.
3. Test for less than 15 Ω between the control circuit terminal B and ground.
   • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate S79 window switch.
4. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
5. Ignition ON, command the M74 window motor UP and DOWN by using the S79 window switch. The test lamp should briefly illuminate during the UP and DOWN commands.
   • If the test lamp does not illuminate during the UP or DOWN command, test either control circuit for a short to ground. If the circuits tests normal, replace the S79 window switch.
6. If all circuits test normal, test or replace the M74 window motor.