Circuit/System Description

WARNING: This page is about a different variant/trim than selected.

The Backup Lamp (Reverse Position) switch is a two wire switch mounted on the transmission assembly. The Backup Lamp switch is connected to a 12 V signal circuit from the engine control module (ECM). The ground circuit is connected to chassis ground. The Backup Lamp switch is a normally open switch. The voltage on the Backup Lamp switch signal circuit to the ECM is HIGH when the switch is open and LOW when the switch is closed. When the transmission is placed in the reverse position, the backup lamp switch closes and the ECM sends a serial data message to the Body Control Module (BCM). The message indicates that the gear selector is in the reverse position. The BCM applies battery voltage to the backup lamps. When the gear selector is moved out of the reverse position, a message is sent by the ECM via serial data requesting the BCM to remove battery voltage from the backup lamp control circuit.