Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B1289 01: Video Display Brightness Control Signal Short to BatteryDTC B1289 02: Video Display Brightness Control Signal Short to Ground
DTC B1289 04: Video Display Brightness Control Signal Open
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
DVD Display B+ | 1 | 1 | 1 | -- |
Radio ON Signal | 1 | 1 | 1 | -- |
Video Display Brightness Control | B1289 02 | B1289 04 | B1289 01 | -- |
Video Display Mode Control | B1288 02 | B1288 04 | B1288 01 | -- |
Video High Signal | 1 | 1 | 1 | -- |
Video Low Signal | 1 | 1 | 1 | -- |
DVD Display Ground | -- | 1 | -- | -- |
1. Video Entertainment System Inoperative. | ||||
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
Connector End View Reference
Entertainment/Communication Connector End Views
Electrical Information Reference
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the rear video display.
- Ignition ON, test for 100-300 Hz at the control circuit terminal 9.
- If all circuits test normal, replace the rear video display.
| ⇒ | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for radio replacement, setup, and programming |
