Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

B1265 01

Ignition OFF, radio OFF, radio B+ fuse removed, disconnect all of the connectors listed below:
- Audio Amplifier X3
- Video Signal Splitter X1 (if equipped)
- Front Digital Video Disc Display (if equipped)
- Rear Digital Video Disc Display (if equipped)
Reinstall the radio B+ fuse. Ignition OFF, radio OFF, verify that a test lamp does not illuminate between the entertainment remote enable circuit terminals listed below and ground:
- Audio Amplifier X3 terminal 8
- Video Signal Splitter X1 terminal 11 (if equipped)
- Front Digital Video Disc Display terminal 8 (if equipped)
- Rear Digital Video Disc Display terminal 8 (if equipped)
- If the test lamp illuminates, test the entertainment remote enable circuit for a short to voltage. If the circuit tests normal replace the radio.
Re-connect the harness connectors listed below one at a time. Verify that DTC B1265 01 does NOT set as current as each component is re-connected.
- Audio Amplifier X3
- Video Signal Splitter X1 (if equipped)
- Front Digital Video Disc Display (if equipped)
- Rear Digital Video Disc Display (if equipped)
- If DTC B1265 01 sets as current, replace the module/component that was just re-connected.

B1265 02

Ignition OFF, radio OFF, radio B+ fuse removed, disconnect all of the connectors listed below:
- Audio Amplifier X3
- Video Signal Splitter X1 (if equipped)
- Front Digital Video Disc Display (if equipped)
- Rear Digital Video Disc Display (if equipped)
Reinstall the radio B+ fuse. Ignition ON, radio ON, verify that a test lamp illuminates between the entertainment remote enable circuit terminals listed below and ground:
- Audio Amplifier X3 terminal 8
- Video Signal Splitter X1 terminal 11 (if equipped)
- Front Digital Video Disc Display terminal 8 (if equipped)
- Rear Digital Video Disc Display terminal 8 (if equipped)
- If the test lamp does not illuminate, test the entertainment remote enable circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the radio.
Re-connect the harness connectors listed below one at a time. Verify that DTC B1265 02 does NOT set as current as each component is re-connected.
- Audio Amplifier X3
- Video Signal Splitter X1 (if equipped)
- Front Digital Video Disc Display (if equipped)
- Rear Digital Video Disc Display (if equipped)
- If DTC B1265 02 sets as current, replace the module/component that was just re-connected.