Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the S3 Transmission Shift Lever. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the low reference circuit terminal 18 and ground.
- If 10 Ω or greater
1. Ignition OFF, disconnect the harness connector at the K38 Chassis Control Module.
2. Test for less than 2 Ω in the low reference circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K38 Chassis Control Module.
- If less than 10 Ω
Ignition ON/Vehicle in Service Mode.
Verify the scan tool Transmission Shift Interlock Switch 1 parameter is greater than 95%.
- If less than 95%
1. Ignition OFF, disconnect the harness connector at the K38 Chassis Control Module.
2. Test for infinite resistance between the signal circuit terminal 19 and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the K38 Chassis Control Module.
- If greater than 95%
Install a 3 A fused jumper wire between the signal circuit terminal 19 and the low reference circuit terminal 18.
Verify the scan tool Transmission Shift Interlock Switch 1 is less than 5%.
- If greater than 5%
1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K38 Chassis Control Module, Ignition ON/Vehicle in Service Mode.
2. Test for less than 1 V between the signal circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V
3. Ignition OFF
4. 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, replace the K38 Chassis Control Module.
- If less than 5%
Test or replace the S3 Transmission Shift Lever and S156 Transmission Shift Lever Knob.