Charge Lamp/Indicator: Description and Operation

CIRCUIT OPERATION
The charging system lamp is used to alert the operator that the charging system voltage has fallen above or below the normal operating range. When the Powertrain Control Module (PCM) determines a problem, a message is sent across the CCD Bus to the Body Control Module (BCM).

The BCM processes this message and sends a signal on the CCD Bus to the instrument cluster for lamp illumination. This lamp also is illuminated. for a few seconds, when the ignition switch is moved from the OFF to the RUN position as a bulb check.