B1289

DTC B1289

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B1289 01

-
Video Display Brightness Control Signal Short to Battery

DTC B1289 02

-
Video Display Brightness Control Signal Short to Ground

DTC B1289 04

-
Video Display Brightness Control Signal Open Circuit

Diagnostic Fault Information






Circuit/System Description

The radio can control the video display brightness 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 screen brightness to the desired level.

Conditions for Running the DTC

* Ignition ON.

* Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

The DTC will set when the radio detects a short to voltage, short to ground, or an open/high resistance in the video display brightness control circuit 400 ms after the radio activates the remote enable circuit.

Action Taken When the DTC Sets

The radio sets the DTC and defaults the video display to full brightness.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

Video System Schematics Video System Schematics

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

Description and Operation

Video Entertainment System Description and Operation (Non-Headrest DVD Systems) Video Entertainment System (Non-Headrest DVD Systems)Video Entertainment System Description and Operation (Dual Headrest DVD Systems) Video Entertainment System (Dual Headrest DVD Systems)

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the rear video display.

2. Ignition ON, test for 100-300 Hz at the control circuit terminal 9.

• If not within the specified range, test the control circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the radio.

3. If all circuits test normal, replace the rear video display.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Video Display Replacement (U42/C3U) Video Display Replacement (U42/C3U)Video Display Replacement (U42) Video Display Replacement (U42)

* Control Module References Programming and Relearning for Radio replacement, setup, and programming