Circuit/System Testing
NOTE:
Circuit/System Verification must be performed before proceeding with Circuit/System Testing.
- Ignition ON, disconnect the harness connector at the S39 Ignition Switch while the ignition is ON.
- Verify a test lamp illuminates between the B+ circuit terminal 2 and ground.
- If the test lamp does not illuminate and the circuit fuse is good
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
- Test for infinite resistance between the B+ circuit and ground.
- If less than infinite resistance, repair the short to ground on the circuit.
- If infinite resistance
- Test for infinite resistance between the signal circuit and ground.
- If less than infinite resistance, repair the short to ground on the circuit.
- If infinite resistance, replace the K9 Body Control Module.
- If the test lamp illuminates
- If the test lamp does not illuminate and the circuit fuse is good
- Verify the scan tool Key in Ignition Status parameter is Inactive.
- If not Inactive
- Disconnect the X3 harness connector at the K9 Body Control Module.
- Test for less than 1 V between the signal circuit terminal 4 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 Inactive
- Install a 3 A fused jumper wire between the signal circuit terminal 4 and the B+ circuit terminal 2.
- Verify the scan tool Key in Ignition Status parameter is Active.
- If not Active
- 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, replace the K9 Body Control Module.
- If Active
- Test or replace the S39 Ignition Switch.