Vauxhall Workshop Service and Repair Manuals

DTC B2955

Diagnostic Instructions

DTC Descriptor

Diagnostic Fault Information

Circuit/System Description

When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the key is energised by the exciter coils surrounding the ignition lock cylinder. The transponder transmits a signal to the body control module (BCM). The BCM then compares this value to a value stored in memory. If the value is correct, the BCM will send the prerelease password via the serial data circuit to the engine control module (ECM). If the learned key code does not match or a transponder value is not received, the BCM will send the start disable password to the ECM.

Conditions for Running the DTC

Ignition is in the Accessory or Run position.

Conditions for Setting the DTC

The BCM is unable to measure the ignition key transponder value.

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Immobiliser Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Immobiliser Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Inspect all available vehicle keys that they are correct vehicle keys.

⇒	If not a correct vehicle key, replace the key.

2. While viewing the scan tool BCM Transponder Key Part Number, turn ON the ignition with each of the available vehicle keys. The parameter should read a Key Part Number with all available keys.

⇒	If only one key results in the parameter reading no Part Number, replace the appropriate key.

⇒	If no key results in the parameter reading no Part Number, continue with test step 3.

3. Ignition OFF, disconnect the harness connector at the K89 Immobilizer Control Module and disconnect the harness connector X3 at the K9 Body Control Module. Test for infinite resistance between the signal circuit listed below and ground.

•	K9 Body Control Module terminal 1 X3

•	K9 Body Control Module terminal 2 X3

•	K9 Body Control Module terminal 3 X3

⇒	If less than the specified range, test the appropriate signal circuit for a short to ground.

4. Test for less than 0.3 V between the signal circuit listed below and ground:

•	K9 Body Control Module terminal 1 X3

•	K9 Body Control Module terminal 2 X3

•	K9 Body Control Module terminal 3 X3

⇒	If greater than the specified range, test the appropriate signal circuit for a short to voltage.

5. Test for less than 5 Ω between the signal circuit terminal listed below at the K9 Body Control Module and the signal circuit terminal listed below at the K89 Immobilizer Control Module.

•	K9 Body Control Module terminal 1 X3 and K89 Immobilizer Control Module terminal 1

•	K9 Body Control Module terminal 2 X3 and K89 Immobilizer Control Module terminal 2

•	K9 Body Control Module terminal 3 X3 and K89 Immobilizer Control Module terminal 3

⇒	If greater than the specified range, test the appropriate signal circuit for an open/high resistance.

6. If all circuits test normal, replace the K89 Immobilizer Control Module and verify that the customer concern is not still present.

⇒	If the customer concern is still present, replace the K9 Body Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.