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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Window Motor Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate M74 window motor.
  2. Test for less than 5 Ω between the ground circuit terminal 4 and ground.
    • 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 1 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Test for 4-8V between the serial data circuit terminal 6 and ground.
    • If greater than the specified range, test the serial data circuit for a short to voltage. If the circuit tests normal, replace the appropriate K15 door control module.
    • If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K15 door control module
  5. Ignition OFF, connect the harness connector at the M74 window motor.
  6. Ignition ON, verify that the scan tool Window Motor Fault Status parameter is No Fault.
    • If the value is Motor Fault, Hall Fault, Memory Fault, LIN Fault, Anti-Trap Fault or Thermo Active, replace the M74 window motor.
  7. If all circuits test normal, replace the M74 window motor.

Rear Passenger Window Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate S79R window switch-rear.
  2. Ignition ON, test for less than 1 Ω between the signal circuit terminal 4 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate K15 door control module.
  3. Test for greater than 10V between the reference circuit terminal 3 and ground.
    • If less than the specified value, test the reference circuit for a short to ground or and open/high resistance. If the circuit tests normal replace the K15 door control module.
  4. If all circuits test normal, test or replace the S79R window switch-rear.
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