Rear Tail Lamp Assembly
| Refer to REAR EXTERIOR LAMPS AND LIGHTING . |
BACKUP LAMP - The backup (or reverse) lamps have a path to ground at all times through a takeout and eyelet terminal of the body wire harness that is secured by a nut to a ground stud on the body sheet metal within the passenger compartment. On vehicles with a manual transmission, the backup lamp switch provides a hardwired input to the BCM through a reverse switch signal circuit and the BCM provides battery voltage to the backup lamps on the backup lamp feed circuit whenever the ignition switch is in the ON position and the REVERSE position is selected with the transmission shift linkage.
On automatic transmission equipped vehicles the TCM monitors a multiplex input from the Transmission Range Sensor (TRS), then sends the proper electronic transmission gear selector status messages to other electronic modules over the CAN. Whenever the ignition is in the ON position and the BCM receives an electronic message indicating the status of the transmission gear selector is REVERSE, it provides a battery voltage output through a high side driver to the backup lamps on the backup lamp feed circuit.
BRAKE LAMPS
BRAKE - The brake (or stop) lamps and the CHMSL each have a path to ground at all times through a takeout and eyelet terminal of the body wire harness that is secured by a nut to a ground stud on the body sheet metal within the passenger compartment. The CHMSL receives battery voltage directly on the stop lamp sensor output circuit when the sensor is closed by the brake pedal arm. The BCM also receives battery voltage on the sensor output circuit, which it uses as a signal to energize the brake lamps. The BCM provides battery voltage to the brake lamps through a high side driver on the tail/stop lamp rear feed circuit when it receives the proper input from the closed brake lamp switch.
TURN SIGNAL LAMP - The turn signals can be activated using the left stalk switch input to the Steering Column Control Module (SCCM) which sends the command to the BCM over the CAN-C bus. When the turn signal lamps are switched on, the BCM activates a CAN-IHS signal corresponding to the selected side with a blinking scheme and synchronous to the lights activation. At the same time that the turn signal lights are switched ON, the BCM also activates internal signals that are active for the length of the turn signal event.