Circuit/System Testing

Vehicle OFF, disconnect the X2 harness connector at the T3 Audio Amplifier. Vehicle in Service Mode, radio ON, mute ON.
NOTE: To prevent misdiagnosis, the door chime must be OFF during testing. Ensure the driver door latch is closed during testing.
Test for 7.5-8.5 V between the amplifier control circuit terminal 12 and ground.
- If greater than 8.5 V
1. Vehicle OFF, disconnect the X1 harness connector at the A11 Radio. Vehicle in Service Mode.
2. Test for less than 1 V between the control 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 less than 7.5 V
1. Vehicle OFF, disconnect the X1 harness connector 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 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the A11 Radio.
- If between 7.5-8.5 V
A11 Radio ON, mute OFF.
Test for less than 1 V between the amplifier control circuit terminal 12 and ground.
- If 1 V or greater
  Replace the A11 Radio.
- If less than 1 V
Test or replace the T3 Audio Amplifier.