Courtesy Lamps Control

The Body Control Module (PZM) controls the following:
^ The courtesy lamps based on keyless entry transmitter inputs
^ Ambient light conditions
^ Door lock actuator status
^ Door lock cylinder switch status
^ Interior lamps switch status
^ Ignition switch status

The door position is monitored through the door lock actuators by the PZM. When a door is opened, the respective door lock actuator closes and grounds the door open input to the PZM. When a door is closed, the door lock actuator opens and removes ground from the PZM. When a front door is manually unlocked, the respective door lock cylinder switch closes and grounds the door unlock input to the PZM.

The courtesy lamps can be turned on by the interior lamp 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 courtesy/reading lamps may be turned on by pressing the lamp. When this is done, the courtesy/reading lamp switch grounds the lamp to G401 via CKT 1250 (BLK). The lamps will only illuminate 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 the RUN position or after any action that would activate or deactivate the courtesy lamps, such as the interior lamp switch or opening a door.