Circuit Description
The body control module (BCM) controls the operation of the fog lamps. When the park lamps are ON, and the fog lamp switch is turned ON, the BCM grounds the control circuit of the fog lamp relay in order to illuminate the fog lamps.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2532 Front Fog Lamps Control Circuit Low
Conditions for Running the DTC
| • | Voltage supplied to the module is in the normal operating range, approximately 9-16 volts. |
| • | The front fog lamp feature is enabled. |
Conditions for Setting the DTC
| • | The BCM detects a short to ground or an open in the control circuit of the fog lamp relay when the fog lamps are not commanded ON. |
| • | The condition is present for longer than 3 ms. |
Action Taken When the DTC Sets
The BCM stores DTC B2532 in memory.
Conditions for Clearing the MIL/DTC
| • | A current DTC B2532 clears when the BCM no longer detects an open or a short to ground in the control circuit of the fog lamp relay. |
| • | A history DTC B2532 clears after 100 consecutive ignition cycles. |
| • | A DTC B2532 will clear when commanded by a scan tool. |
Diagnostic Aids
| • | If the DTC B2532 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections . |
| • | An intermittent short to ground or an open in the following locations may cause an intermittent malfunction to occur: |
| - | The control circuit of the fog lamps relay |
| - | The fog lamps relay |
| - | The BCM |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Fog Lights Schematics Connector End View Reference: Master Electrical Component List | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does the fog lamps relay turn ON and OFF with each command? | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 10 |
4 |
Does the test lamp turn ON and OFF with each command? | Go to Step 8 | Go to Step 5 |
5 | Does the test lamp remain illuminated with each command? | Go to Step 7 | Go to Step 6 |
6 | Test for an open in the control circuit of the fog lamps relay. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
7 | Test for a short to ground in the control circuit of the fog lamps relay. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
8 | Inspect for a poor connection at the fog lamps relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 11 |
9 | Inspect for a poor connection at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
10 | Replace the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections . Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the fog lamps relay. Refer to Relay Replacement . Did you complete the replacement? | Go to Step 13 | -- |
12 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 13 | -- |
13 |
Does the DTC reset? | Go to Step 2 | System OK |
