Circuit/System Testing

WARNING: This page is about a different car, the 2016 Chevrolet Trax and 2016 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the X1 harness connector at the component listed below.
- K20 Engine Control Module
- T12 Automatic Transmission Assembly (with MH8/MHB)
Connect a test lamp between the appropriate signal circuit terminal listed below and ground, ignition ON.
- K20 Engine Control Module terminal 33
- T12 Automatic Transmission Assembly terminal 10 (with MH8/MHB)
Verify the test lamp turns ON and OFF while pressing and releasing the brake pedal.
- If the test lamp is always OFF
1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module.
2. 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
3. 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 the test lamp is always ON
1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit terminal 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 the test lamp turns ON and OFF
Test or replace the inoperative component.