2008 Chevrolet Suburban - 4WD | Avalanche, Escalade, Suburban, Tahoe, Yukon VIN C/K Service Manual | Document ID:(###) ###-####/p>
#PIT4474E: Navigation Or Radio Display Blank Or Flashing DTC B1265, B1288 Or B1289 - (Jan 28, 2014)
Subject: Navigation Or Radio Display Blank Or Flashing DTC B1265, B1288 Or B1289
Models: 2007-2014 Cadillac Escalade Models
2007-2013 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2014 Chevrolet Silverado 2500/3500, Suburban, Tahoe
2007-2013 GMC Sierra, Yukon Models
2014 Sierra 2500/3500, Yukon Models
This PI was superseded to update model years. Please discard PIT4474D.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Some customers may comment of one or all of the following concerns:
- Navigation or radio screen is blank or flashes on and off
- No sound from speakers
- Rear DVD screen inoperative
- DTC B1265, B1288 Or B1289
- Navigation disclaimer message intermittently will be displayed (see below)
This condition may be caused by the remote enable signal wire circuit 7066 being shorted to ground. This remote enable signal comes from the radio and feeds the Amplifier (except vehicles with RPO Y91 or any 2009 and later Chevrolet Utility equipped with RPO STZ), the antenna module (utilities only), and the rear video display (with RPO U42).
Note: When the remote enable signal wire (Circuit 7066) is first shorted to ground, the navigation screen or radio display may start to flash. If the wire remains shorted for more than 2 minutes, the navigation or radio display goes blank. The radio's current limiting logic will not re-enable the output on the entertainment remote enable circuit until after the radio performs a full power–down. It may be necessary to wait 5 minutes with the key OFF and retained accessory power OFF for the radio to re-enable this output.
If you experience this concern, check for a short to ground on the remote enable signal wire (Circuit 7066) and repair and re-route the circuit as needed. The most common area of concern is a shorted wiring harness near the rear DVD display screen under the headliner
I didn't see one however i did find this bulletin, here is the schematic for the circuit in question