Circuit/System Testing

WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S2 Transmission Shift Switch. It may take up to 2 min for all vehicle systems to power down.
Test for 11-13 V at the harness connector terminal 2.
- If not between 11-13 V
1. Test for 11-13 V on both test points of the circuit fuse.
  - If both test points are 11-13 V
    Repair the open/high resistance in the circuit.
  - If one test point is 11-13 V
    Repair the short to ground in the circuit.
  - If between 11-13 V
Ignition OFF.
Disconnect the X3 harness connector at the K9 Body Control Module.
Test for less than 2 Ω in the signal circuit end to end.
- If 2 Ω or greater
  Repair the open/high resistance in the circuit.
- If less than 2 Ω
Test for the infinite resistance between the signal circuit and ground.
- If less than infinite resistance
  Repair the short to ground.
- If infinite resistance
Test for 8000-8500 Ω on terminal 1 and terminal 2 at the S2 Transmission Manual Shift Switch.
- If not between 8000-8500 Ω
  Replace the S2 Transmission manual Shift Switch.
- If between 8000-8500 Ω
Test for 4200-4600 Ω on terminal 1 and terminal 2 at the S2 Transmission Manual Shift Switch with the switch closed.
- If not between 8000-8500 Ω
  Replace the S2 Transmission Manual Shift Switch.
- If between 8000-8500 Ω
Replace the K9 Body Control Module.