Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Some circuits supply audio signals to more than one speaker. It may be necessary to disconnect all speakers on the affected audio circuit when performing circuit tests.

Ignition OFF, disconnect the harness connector at the appropriate speaker. Radio ON, mute OFF.
Test for 5-7 V between the signal circuit terminals listed below and ground:
- Door speaker, rear speaker or tweeter speaker audio signal (-) terminal 1
- Door speaker, rear speaker or tweeter speaker audio signal (+) terminal 2
- Subwoofer audio signal (-) terminals 1 and 9 (convertible with UQ3)
- Subwoofer audio signal (+) terminals 2 and 10 (convertible with UQ3)
- If less than 5 V
1. Ignition OFF, disconnect the X1 harness connector at the A11 radio.
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 A11 radio.
- If greater than 7 V
1. Ignition OFF, disconnect the X1 harness connector at the A11 radio. Ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the A11 radio.
- If between 5-7 V
Test or replace the P19 speaker.