Amplifier Circuit Malfunction
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X1 harness connector at the audio amplifier.
- Ignition OFF, test for less than 10 ohms between the ground circuit terminal 8 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, test for B+ between the B+ circuit terminal 4 and ground.
- If less then specified value, test the circuit for a short to ground, or an open/high resistance.
- Ignition OFF, disconnect the X3 harness connector at the audio amplifier.
- For vehicles without RPO code Y91 only: Radio ON, test for B+ between the signal circuit terminal 8 and ground.
- If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- If all circuits test normal, replace the audio amplifier.