B2533

DTC B2533

CIRCUIT DESCRIPTION
When the body control module (BCM) senses that the front fog lamp switch signal circuit is grounded momentarily by pressing the front fog lamp switch, the BCM energizes the front fog lamp relay by grounding the front fog lamp relay control circuit. The front fog lamp indicator is also illuminated utilizing the same fog lamp relay control circuit.

CONDITIONS FOR RUNNING THE DTC
The battery voltage must be between 9.0 - 16.0 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 not operate or will remain always on.

CONDITIONS FOR CLEARING THE MIL/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.
- History and current DTC(s) can be cleared using a scan tool.

TEST DESCRIPTION

Steps 1 - 2:

Steps 3 - 8:

Steps 9 - 13:

The numbers below refer to the step numbers on the diagnostic table.
2. Listen for an audible click when the front fog lamp relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for ground at the coil side of the front fog lamp relay.
4. Verifies that the BCM is providing battery positive voltage to the front fog lamp relay.
5. Tests if battery positive voltage is constantly being applied to the front fog lamp relay.
6. Tests if a condition exists in the front fog lamp relay control circuit.
12. After replacement of the BCM you must calibrate the new module for proper operation.