Buick Regal: DTC B2530
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 Descriptor
DTC B2530 02
Front Fog Lamps Control Circuit Short to Ground
Diagnostic Fault Information
1. Front Fog Lamps Malfunction
Circuit/System Description
The front fog lamp relay is supplied with battery voltage at all times. The
front fog lamp switch signal
circuit is grounded momentarily by pressing the front fog lamp switch. The body
control module (BCM)
energizes the front fog lamp relay by applying ground to the front fog lamp
relay control circuit. When
the front fog lamp relay is energized, the relay switch contacts close and
battery voltage is applied to the
front fog lamp control circuit which illuminates the front fog lamps.
Conditions for Running the DTC
- Battery voltage must be between 9-16 V.
- Front fog lamps ON.
Conditions for Setting the DTC
The BCM detects a short to ground in the front fog lamp relay control
circuit.
Actions Taken When the DTC Sets
The front fog lamps will not operate when the park lamps are ON and the front
fog lamp switch is
active.
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
Fog Lights Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Exterior Lighting Systems Description and Operation
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 Testing
1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control
Module, ignition ON.
NOTE: The test lamp in the following step will illuminate at LOW
intensity.
This is normal circuit operation and does not indicate a circuit
malfunction.
2. Verify a test lamp illuminates between the control circuit terminal 20 and
ground.
- If the test lamp does not illuminate
- Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block
- Underhood.
- Test for infinite resistance between the control circuit terminal 20 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the X50A Fuse Block - Underhood.
- Go to next step: If the test lamp illuminates
3. Ignition OFF, connect a 3 A fused jumper between the control circuit
terminal 20 and ground.
4. Remove the F7UA fog lamp fuse at the X50A Fuse Block - Underhood, ignition
ON.
5. Verify a test lamp illuminates between the F7UA fog lamp fuse B+ switch
control terminal and
ground.
- If the test lamp does not illuminate
- Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block
- Underhood,
ignition ON.
- Test for less than 1 V between the control circuit terminal 20 and
ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the X50A Fuse Block - Underhood.
- Go to next step: If the test lamp illuminates
6. Test or replace the K9 Body Control Module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Engine Wiring Harness Fuse Block Bracket Replacement
- Control Module References for BCM replacement, programming, and setup
READ NEXT:
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.
Diag
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.
Diag
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.
Diag
SEE MORE:
GM recommends the use of TOP
TIER Detergent Gasoline to keep
the engine cleaner and reduce
engine deposits. See
www.toptiergas.com for a list of TOP
TIER Detergent Gasoline marketers
and applicable countries.
Do not use any fuel labeled E85 or
FlexFuel. Do not use gasoline with
ethanol levels great
Preliminary Procedure
Radiator Replacement (2.0L LTG) or Radiator Replacement (3.6L LGX)
Radiator Lower Insulator [2x]
RADIATOR AIR LOWER BAFFLE REPLACEMENT
Removal Procedure
1. Front Bumper Fascia - Remove.
2.
Body Wiring Harness (2) - Unclip.
3. Ambient Air Temperature Sensor (3) - Remove.