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, radio OFF, radio B+ fuse removed. Disconnect all of the harness connectors listed below:
- T3 Audio Amplifier X3 (if equipped)
- P17 Info Display Module X1 (if equipped)
Install the radio B+ fuse. Ignition ON, A11 Radio ON.
Verify that a test lamp illuminates between the control circuit terminals listed below and ground:
- T3 Audio Amplifier X3 terminal 8 (if equipped)
- P17 Info Display Module X1 terminal 6 (if equipped)
- If the test lamp does not illuminate.
1. Ignition OFF. Disconnect the X1 harness at the A11 Radio.
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 than 2 Ω, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the A11 Radio.
- If the test lamp illuminates.
Verify that DTC B1265 does NOT set as each component is connected one at a time.
- If DTC B1265 sets.
  Replace the module/component that was just connected
- If DTC B1265 does not set.
All OK.