Reverse Lamps Malfunction - AT

Make: Vauxhall
Model: Astra J
Section: Lighting › Other Information › Reverse Lamps Malfunction - AT

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Body SystemsReverse Lamps Malfunction - AT

Backup Lamps Malfunction (AT)

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.

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Reverse Gear Signal	1	1	1	1, 2
1. Reverse Gear Lamp Inoperative 2. Reverse Gear Lamp Always ON

Circuit/System Description

When the automatic transmission is placed in the reverse position, the transmission control module (TCM) sends a serial data message to the body control module (BCM). The message indicates that the gear selector is in the reverse position. The BCM applies battery voltage to the backup lamp. The backup lamp are permanently grounded. Once the driver moves the gear selector out of the reverse position, a message is sent by the TCM via serial data requesting the BCM to remove battery voltage from the backup lamp control circuit.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, perform the Backup Lamp Relay test. The backup lamp should be ON/OFF.

Circuit/System Testing

Observe the parameter Tap Up/Down Switch when putting the gear selector is in the reverse position. The parameter Tap Up/Down Switch should display that reverse gear is engaged.

If the Tap Up/Down Switch parameter displays the corresponding gear, replace the K9 Body Control Module. If the Tap Up/Down Switch parameter does not displays the corresponding gear, refer to Transmission Control Lever Malfunction .

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Backup Lamp Bulb Replacement

•	Backup Lamp Replacement

•	Control Module References for BCM replacement, setup and programming