2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 445

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 445

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Radio ON, adjust the fade and balance control to verify audio is present at each individual channel.

Circuit/System Testing

1. Ignition OFF, disconnect the X3 harness connector at the audio amplifier.

2. Ignition ON, radio ON and un-muted, test for 0.5-1.0 volts between the amplifier control circuit terminal 11 and ground.

瀚慖f greater than the specified value, test the amplifier control circuit for a short to voltage. If the circuit tests normal, replace the radio.

瀚慖f 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.

3. If all circuits test normal, replace the amplifier.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning) for radio or amplifier replacement

B1288

DTC B1288

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B1288 01

- Video Display Mode Control Signal Short to Battery

DTC B1288 02

- Video Display Mode Control Signal Short to Ground

DTC B1288 04

- Video Display Mode Control Signal Open Circuit

Diagnostic Fault Information

Circuit/System Description

The radio can control the video display mode on vehicles equipped with rear seat entertainment (RSE) video. The radio varies a pulse with

modulated (PWM) signal to the rear entertainment video screen to command the display mode.