Circuit/System Testing

Verify a test lamp illuminates between the 12V B+ circuit ring terminal and ground.
- If the test lamp does not illuminate and the circuit fuse is good
1. Remove the test lamp and disconnect the B+ cable at the 14V power module.
2. Test for less than 2 Ω in the B+ circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
- If the test lamp does not illuminate and the circuit fuse is open
1. Remove the test lamp, disconnect the battery negative cable and disconnect the 14V power module B+ cable.
2. Test for infinite resistance between the B+ circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
- If the test lamp illuminates
Disconnect the X1 harness connector at the 14V power module, vehicle ON.
Test for 3.0- 5.5 V between the control circuit terminal X1-01 and ground.
- If less than 3.0 V
1. Vehicle OFF, disconnect the harness connectors at the K20 ECM.
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 greater the 2 Ω, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K20 ECM.
- If greater than 5.5 V
1. Vehicle OFF, disconnect the harness connectors at the K20 ECM, Vehicle ON.
2. Test for less than 1 V between the control circuit and ground.
  - If greater than 1 V, repair the short to voltage on the circuit.
  - If less than 1 V, replace the K20 ECM.
- If between 3.0-5.5 V
Test or replace the K1 14V Power Module.