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.
IMPORTANT:
Verify the DVD player in the radio is operating normally before performing this diagnostic procedure. If there is any problems with operating the DVD player, refer to Symptoms - Entertainment
- Ignition OFF, disconnect the X3 harness connector at the radio.
- Ignition ON, test for less then 1 volt between the appropriate signal circuit terminals listed below and ground.
- Auxiliary audio left signal (+) - terminal 1
- Auxiliary audio right signal (+) - terminal 2
- Auxiliary audio drain wire (-) - terminal 9
- Auxiliary video signal (+) - terminal 8
- Auxiliary video drain wire (+) - terminal 16
- If greater then specified range, test the circuit for a short to voltage.
- Test for infinite resistance between the terminals listed below and ground.
- Auxiliary audio left signal (+) - terminal 1
- Auxiliary audio right signal (+) - terminal 2
- Auxiliary audio drain wire (-) - terminal 9
- Auxiliary video signal (+) - terminal 8
- Auxiliary video drain wire (+) - terminal 16
- If less then the specified value, test the circuit for a short to ground.
- Test for less then 5 ohm between the terminals on the radio X3 harness connector and the external terminals on the audio/video adaptor listed below:
- Auxiliary audio left signal (+) - terminal 1 and the inside of the center (white) jack
- Auxiliary audio right signal (+) - terminal 2 and the inside of the right (red) jack
- Auxiliary audio drain wire (-) - terminal 9 and the outside of both the center (white), and the right (red) jacks
- Auxiliary video signal (+) - terminal 8 and the inside of the left (yellow) jack
- Auxiliary video drain wire (+) - terminal 16 and the outside of the left (yellow) jack
- If greater then the specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the adaptor.
- If all circuits test normal, replace the radio.