Circuit/System Testing

Ignition OFF, radio OFF, remove the radio B+ fuse.
Disconnect the X3 harness connector at the T3 Audio Amplifier.
Install the radio B+ fuse. Ignition ON, A11 Radio ON.
Verify that a test lamp illuminates between the control circuit terminal 8 and ground:
- 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.
Ignition OFF. Connect the X3 harness connector at the T3 Audio Amplifier.
Ignition ON, A11 Radio ON.
Verify that DTC B1265 is NOT set.
- If DTC B1265 is set.
  Replace the T3 Audio Amplifier.
- If DTC B1265 is not set.
All OK.