Circuit/System Testing

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the harness connector at the B16 Backup Lamp Switch.
Test for less than 5 Ω between the ground circuit terminal 2 and ground.
- If 5 Ω or greater
1. 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 connection.
- If less than 5 Ω
Ignition ON, transmission in neutral position.
Verify the scan tool Reverse Position Switch parameter is Off.
- If the parameter ON
1. Disconnect the X1 harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the signal circuit terminal 1 and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the K20 Engine Control Module.
- If the parameter is OFF
Ignition ON, install a 3 A fused jumper wire between the signal circuit terminal 1 at the B16 Backup Lamp Switch harness connector and ground.
Verify the scan tool Reverse Position Switch parameter is On.
- If the parameter is Off
1. Disconnect the X1 harness connector at the K20 Engine Control Module.
2. 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 K20 Engine Control Module.
- If the parameter is On
Test or replace the B16 Backup Lamp Switch.