Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 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 signal circuit terminal 11 and ground.
- If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
- If less than the specified value, 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 amplifier.