Workshop Manuals Factory service & repair Vauxhall
Vauxhall Astra J05 · Body Systems
05 · Body & interior

DTC B2540

Make
Vauxhall
Model
Astra J
Section
Diagnostic Information and Procedures › Miscellaneous › DTC B2540
Body SystemsDTC B2540

DTC B2540

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 B2540 01: Rear Fog Lamps Control Circuit Short to Battery
DTC B2540 02: Rear Fog Lamps Control Circuit Short to Ground
DTC B2540 04: Rear Fog Lamps Control Circuit Open

Diagnostic Fault Information



Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance

Rear Fog Lamp Control
B2540 02**
B2540 04**
B2540 01*
-

* Fog lamp always ON

** Fog lamp always OFF
 

Circuit/System Description

The body control module (BCM) energizes the rear fog lamp by applying voltage to the rear fog lamp control circuit. When the rear fog lamp control circuit is energized, the rear fog lamp is illuminated.

Conditions for Running the DTC

Rear fog lamp activated

Conditions for Setting the DTC

B2540 01

The BCM detects a short to battery on the control circuit.

B2540 02

The BCM detects a short to ground on the control circuit.

B2540 04

The BCM detects an open control circuit.

Action Taken When the DTC Sets

The appropriate fog lamp is inoperative.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Reference Information


Schematic Reference

Fog Lights Schematics


Connector End View Reference

Component Connector End Views


Description and Operation

Exterior Lighting Systems Description and Operation


Electrical Information Reference


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, perform the Rear Fog Lamp(s) Relay test. The rear fog lamp should be ON/OFF when changing between the commanded states.

Circuit/System Testing

1. Ignition OFF, disconnect the appropriate harness connector at the appropriate tail lamp listed below:
  •  E43L Liftgate Tail Lamp Assembly - Left
  •  E43R Liftgate Tail Lamp Assembly - Right
2. Test for less than 5 Ω between the appropriate ground circuit harness connector terminal listed below and ground:
  •  E43L Liftgate Tail Lamp Assembly - Left harness connector terminal 3
  •  E43R Liftgate Tail Lamp Assembly - Right harness connector terminal 2
⇒  If greater than the specified value, test the appropriate ground circuit for an open/high resistance.
3. Connect a test lamp between the appropriate control circuit harness connector terminal listed below and ground:
  •  E43L Liftgate Tail Lamp Assembly - Left harness connector terminal 4
  •  E43R Liftgate Tail Lamp Assembly - Right harness connector terminal 1
4. Ignition ON, perform the Rear Fog Lamps Relay Command test. The rear fog lamp should be ON/OFF when changing between the commanded states.
⇒ If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
⇒ If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 Body Control Module.
5. If all circuits test normal, test or replace the appropriate tail lamp.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•  Control Module References for BCM replacement, setup, and programming

Parts & tools for this job For Vauxhall Astra

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