Display, Blind Spot: Operation

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

The Blind Spot Monitor (BSM) displays provide the vehicle operator with a visual alert that a target vehicle (object of interest) has been detected by the BSM system within one of the BSM or Rear Cross Path (RCP) detection zones. The BSM display is also illuminated momentarily as a bulb test each time the ignition switch status transitions to On as a part of the BSM system self tests. If a BSM display remains illuminated with the park brake applied or with the automatic transmission gear selector lever in the P ark position, it indicates that the BSM system has registered a system fault and may require service.

Each BSM display is completely controlled by a hard wired output of the Driver Door Module (DDM) or Passenger Door Module (PDM) on the same side of the vehicle as the display. The DDM and PDM receive electronic messages over the Controller Area Network (CAN) data bus from the BSM integral to the Left Blind Spot Sensor (LBSS) or Right Blind Spot Sensor (RBSS) for the same side of the vehicle. The display units are grounded at all times through a takeout and eyelet terminal of the body wire harness that is secured to the body sheet metal.

The hard wired circuits between the BSM displays and the DDM or PDM may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the BSM displays or the electronic controls and communication between other modules and devices that provide some features of the BSM displays. The most reliable, efficient and accurate means to diagnose the BSM displays or the electronic controls and communication related to BSM display operation requires the use of a diagnostic scan tool.