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 lamps relay in order to illuminate the fog lamps.
This diagnostic procedure supports the following DTC:
DTC B2533 Front Fog Lamps Control Circuit High
• | Voltage supplied to the module is in the normal operating range, approximately 9-16 volts. |
• | The front fog lamp feature is enabled. |
• | The BCM detects a short to battery positive voltage in the control circuit of the fog lamps relay when the fog lamps are commanded ON. |
• | The condition is present for longer than 3 ms. |
The BCM stores DTC B2533 in memory.
• | A current DTC B2533 clears when the BCM no longer detects a short to battery positive voltage in the control circuit of the fog lamps relay. |
• | A history DTC B2533 clears after 100 consecutive ignition cycles when the condition is no longer present. |
• | A DTC B2533 will clear when commanded by a scan tool. |
• | If the DTC B2533 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections . |
• | An intermittent short to voltage 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 7 |
4 |
Does the test lamp turn ON and OFF with each command? | Go to Step 8 | Go to Step 5 |
5 | Test the control circuit of the fog lamps relay for a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
6 | 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 10 | Go to Step 9 |
7 | Replace the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections . Did you complete the repair? | Go to Step 10 | -- |
8 | Replace the fog lamps relay. Refer to Relay Replacement . Did you complete the replacement? | Go to Step 10 | -- |
9 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 10 | -- |
10 |
Does the DTC reset? | Go to Step 2 | System OK |