Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S38 Ignition Mode Switch. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the ground circuit terminal 1 and ground.
- If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, repair the open/high resistance in the ground connections.
- If less than 10 Ω
Connect the harness connector at the S38 Ignition Mode Switch.
Ignition ON, disconnect the harness connector at the S38 Ignition Mode Switch.
Test for less than 1 V between control circuit terminal 8 and ground while commanding Run/Start Power Mode Indicator Off with the scan tool.
- If 1 V or greater
1. Disconnect the harness connector at the K9 Body Control Module.
2. Test for less than 1 V between the control circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the K9 Body Control Module.
- If less than 1 V
Test for greater than 3 V between the control circuit terminal 8 and ground while commanding Run/Start Power Mode Indicator On with the scan tool.
- If 3 V or less
1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
3. Test for less than 2 Ω in the control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K9 Body Control Module.
- If 3 V or greater
Test or replace the S38 Ignition Mode Switch.