Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the X3 harness connector at the audio amplifier.
- Ignition ON, radio ON and un-muted, test for 0.5-1.0 volts between the amplifier control circuit terminal 11 and ground.
- If greater than the specified value, test the amplifier control circuit for a short to voltage. If the circuit tests normal, replace the radio.
- If less than the specified value, test the amplifier control 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 amplifier.