B2530
DTC B2530
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 Descriptor
DTC B2530
^ Front Fog Lamps Control Circuit
Diagnostic Fault Information
Circuit/System Description
When the body control module (BCM) senses that the front fog lamp switch signal circuit is grounded momentarily when the fog lamp switch is turned on, the BCM energizes the front fog lamp relay by grounding the front fog lamp relay control circuit.
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
* When the BCM receives a front fog lamp switch OFF command and the front fog lamp relay control circuit is shorted to ground.
* When the BCM receives a front fog lamp switch ON command and the front fog lamp relay control circuit is shorted to voltage or open.
Action Taken When the DTC Sets
The front fog lamps will be inoperative or always on.
Conditions for Clearing the DTC
* This DTC will clear on current status after the condition for setting the fault is corrected.
* A history DTC will clear after 100 consecutive ignition cycles without a fault present.
Reference Information
Schematic Reference
Fog Lights Schematics (Wiring Diagram Index)
Connector End View Reference
Component Connector End Views ()
Description and Operation
Exterior Lighting Systems Description and Operation (Exterior Lighting Systems Description and Operation)
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 (Control Module References) for Scan Tool Information
Circuit/System Testing
1. Ignition OFF, disconnect the front fog lamp relay.
2. Connect a test lamp between the relay control circuit terminal 86 and B+.
3. Operate the front fog lamps on and off. The test lamp should turn on and off when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
4. Verify that a test lamp illuminates between the B+ circuit terminal 85 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
5. If all circuits test normal, test or replace the front fog lamp relay.
Component Testing
Relay Test
1. Ignition OFF, disconnect the front fog lamp relay.
2. Test for 70-100 ohms between terminals 85 and 86.
• If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
* 30 and 85
* 30 and 86
* 30 and 87
* 85 and 87
• If not the specified value, replace the relay.
4. Install a 10A fused jumper wire between relay terminal 85 and B+. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
• If greater than the specified range, replace the relay.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Control Module References) for BCM replacement, programming, and setup