Courtesy Lamps Control

The Body Control Module (PZM) controls the courtesy lamps based on keyless entry transmitter inputs, ambient light conditions, door jamb switch status, door lock cylinder switch status, interior lamps switch status, and ignition switch status. Door position is monitored through the door jamb switches by the PZM. When a door is opened, the respective door jamb switch closes and grounds the door switch input to the PZM. When a door is closed the door jamb switch opens and removes ground front the PZM. When a front door is manually unlocked, the respective door lock cylinder switch closes and grounds the door unlock switch input to the PZM.

The courtesy lamps can be turned on by the interior lamps switch regardless of ambient light conditions, door position, or ignition state. When the interior lamps switch is enabled, the instrument cluster interior lamps switch input is grounded through the headlamp switch. In response to this input, the instrument cluster sends a request via the Class 2 serial data line to the PZM to activate the courtesy lamps.

The PZM receives a Class 2 message from the Remote Function Actuator (RFA) when the keyless entry transmitter is used to unlock the vehicle.

Some header lamps may be turned on by pressing the lamp. When this is done, the header lamp switch grounds the lamp to G401 through CKT 1250 (BLK). The lamps will only turn on when battery positive voltage (B+) is being supplied during inadvertent power through the INT LP Fuse.

The PZM will activate the courtesy lamps 15 seconds after receiving a message that the airbags have been deployed. The courtesy lamps will deactivate when the ignition switch is removed from RUN or after any action that would activate or deactivate the courtesy lamps (such as the interior lamps switch or opening a door).