![]() The BCM connects directly to the center console fuse block with no external wiring between them. The BCM grounds the backup lamps relay control circuit energizing the backup lamp relay. ![]() The body control module (BCM) controls the backup lamp relay. The BCM grounds the backup lamp relay control circuit energizing the backup lamp relay. The backup lamps are grounded at G401 and G402.ĭo you know what DTC'S - diagnostic trouble codes are ? When the gear selector lever is in the REVERSE position, power is supplied to both of the backup lamps. The TURN SIG fuse in the console fuse block supplies battery positive voltage to park neutral position switch. YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring SystemsĬonnect a test lamp between the battery positive supply voltage circuit of the switched side of the backup lamp relay and ground.īefore replacing parts you may not need, take your vehicle to a qualified repair shop. Shift the gear selector lever to the REVERSE position. The BCM grounds the backup lamps relay control circuit which energizes the backup lamp relay. With a scan tool, command the backup lamp relay ON and OFF.ĭoes the backup lamp relay turn ON and OFF with each command? Turn ON the ignition, with the engine OFF. The BCM grounds the backup lamp relay control circuit which energizes the backup lamp relay. There is alot involved in turn on the back up lights. When these conditions occur, the BCM energizes the reverse lamp relay control circuit, closing the switch contacts, the current flows from the reverse lamp relay switch to the backup lamps. When you place the gear selector lever in the REVERSE position, the powertrain control module (PCM) sends a class 2 message to the body control module (BCM). The DIC/RKE fuse supplies battery positive voltage to the backup lamps relay coil terminal. The B/U LAMP fuse in the RH I/P fuse block supplies battery positive voltage to the switch terminal of the backup lamps relay. Operate the system in order to verify the repair. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Repair a short to battery positive voltage in the backup lamps supply voltage circuit. Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systemsĭisconnect the body control module (BCM) connector C2. Place the gear selector to the PARK position. Go to Diagnostic System Check - Vehicle in Vehicle DTC Information Schematic Reference: Exterior Lights SchematicsĬonnector End View Reference: Master Electrical Component List in Wiring Systemsĭid you perform the Diagnostic System Check - Vehicle? If no DTC'S are set ,then go to diagnostic flow chart. The left backup lamp is grounded at G301 and the right backup lamp is grounded at G302.ĭTC B2545 is set either when the backup lamps supply voltage circuit is shorted to ground or opened, or if the CHMSL/Bkup fused voltage supply circuit to the BCM is shorted to ground or opened. The BCM then applies battery positive voltage to the backup lamp supply voltage circuit. When the driver places the gear selector in to the REVERSE position, the powertrain control module (PCM) sends a class 2 message to the BCM. The CHMSL/BKUP fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM). Then we read service information on how it works. That would be the first diagnostic step - hook up a factory or some other type of professional scan tool. Any DTC'S - diagnostic trouble codes stored in any module ? PCM/ECM, BCM, TCM etc.
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