B2532

CIRCUIT DESCRIPTION
The fog lamp relay is controlled by the body control module (BCM). On the Chevrolet, battery positive voltage is applied to the relay coil when the headlamp switch is in the PARK or HEAD position. On the Pontiac, battery positive voltage is applied to the relay coil at all times. The BCM grounds the fog lamp relay control circuit in order to turn ON the fog lamp relay. When the fog lamp relay control circuit opens or becomes shorted to ground without being commanded ON by the BCM, DTC B2532 is set.

CONDITIONS FOR RUNNING THE DTC
^ The ignition switch is in the ON position.
^ The headlamp switch is in the HEAD or PARK position.

CONDITIONS FOR SETTING THE DTC
^ The ignition switch is in the ON position.
^ The headlamp switch is the HEAD or PARK position.
^ The fog lamp relay control circuit is open or shorted to ground for 5 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ DTC B2532 is stored in the BCM memory.
^ If the fog lamp relay control circuit is shorted to ground, the fog lamps are always ON when the headlamps or park lamps are ON.
^ If the fog lamp relay control circuit is open, the fog lamps are inoperative.

CONDITIONS FOR CLEARING THE DTC
^ The conditions for setting the DTC are no longer present.
^ A history DTC clears after 100 malfunction free ignition cycles.
^ The BCM receives the clear code command from the scan tool.

DIAGNOSTIC AIDS
^ The fog lamps will only illuminate under the following conditions:
- The park lamps or low beam headlamps are ON.
- The highbeam headlamps are OFF.
- The fog lamp switch is the ON position.
^ If the DTC is a history DTC, the problem may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

TEST DESCRIPTION

Steps 1-3:

Steps 4-13:

The numbers below refer to the step numbers on the diagnostic table.
2. Listen for an audible click when the fog lamp relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
3. Tests for voltage at the coil side of the fog lamp relay.
4. Verifies that the body control module is providing ground to the fog lamp relay.
5. Tests if ground is constantly being applied to the fog lamp relay.