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 seatback video display brightness on vehicles equipped with rear seat entertainment (RSE) video. A single brightness control circuit is used by the radio to control the display screen brightness for both displays via a pulse width modulated signal. If the display screen does not receive a signal, the display screen will operate at default brightness, which is a middle brightness 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 (Connector End Views By Name)
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))Video Entertainment System Description and Operation (Seatback Display) (Video Entertainment System (Seatback Display))
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 Verification

1. Ignition ON, Radio ON, DVD playing, use the infrared remote control to change the brightness level of the seatback video displays.

• If one of both of the seatback video displays brightness level cannot be controlled, refer to Circuit/System Testing.

2. Verify that DTC B1289 is NOT set as current.

• If DTC B1289 is set as current, refer to Circuit/System Testing.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at both of the P22 seatback video displays.
2. Ignition ON, DVD playing, test for 190-210 HZ DC between the video brightness control circuit terminal 16 and ground at each of the P22 seatback video displays.

• 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. Ignition OFF, reconnect the harness connector at the P22E driver seatback video display.
4. Ignition ON, DVD playing, test for 190-210 HZ DC between the video brightness control circuit terminal 16 and ground at the P22F passenger seatback video display.

• If not within the specified range, replace the P22E driver seatback video display.

5. If all circuits test normal, replace the P22F passenger seatback video display.

Repair Instructions

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

* Video Display Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for Radio replacement, setup, and programming