BLIND SPOT MONITORING (BSM) WARNING LIGHT FLASHES WHILE NOT UNDER BLIND SPOT MONITORING (BSM) WARNING LIGHT-FLASHING CONDITIONS (NO LIGHT SWITCH OPERATION (TURN SIGNAL SWITCH)) [BLIND SPOT MONITORING (BSM) SYSTEM (Australian specs.)]

id1503b2020800

Description

BLIND SPOT MONITORING (BSM) WARNING LIGHT FLASHES WHILE NOT UNDER BLIND SPOT MONITORING (BSM) WARNING LIGHT-FLASHING CONDITIONS (NO LIGHT SWITCH OPERATION (TURN SIGNAL SWITCH))

•  The blind spot monitoring (BSM) warning light flashes despite not satisfying the blind spot monitoring (BSM) warning light flashing conditions (vehicle speed above 32 km/h {20 mph} or more, turn signal on, and vehicle in warning zone).

•  The blind spot monitoring (BSM) warning light flashes, but the turn signals are off.

Possible Causes

Note

•  The detection performance of the blind spot monitoring (BSM) control module has limitations and the blind spot monitoring (BSM) system may not operate normally. For the detection performance limitations, refer to the [BLIND SPOT MONITORING (BSM) CONTROL MODULE [Australian specs.]] in the technical guide.

•  Blind spot monitoring (BSM) control module recognizes a vehicle as being inside the warning zone when it is actually outside of it.

―  Radar (blind spot monitoring (BSM) control module integrated) is emitted outside of warning zone (deviates from warning zone)

•  Damage, deformity or looseness to installation bracket or vehicle frame (including moderate impacts).

•  Malfunction in steering angle signal (communication error between rear body control module (RBCM) and blind spot monitoring (BSM) control module, or EPS control module malfunction).

•  Problem with rear bumper such as soiling to radar emitting/receiving area, application of stickers (including transparent types), repairs using putty application.

―  After-market electrical parts interfere with BSM system

•  BSM does not recognize vehicle speed correctly (blind spot monitoring (BSM) control module mistakenly recognizes vehicle speed as being above 32 km/h {20 mph} or more)

―  PCM communication error with blind spot monitoring (BSM) control module

―  Malfunction in ABS wheel speed sensor related parts

•  Blind spot monitoring (BSM) control module mistakenly recognizes that turn signals have been operated

―  Short to ground circuit in wiring harness between combination switch (turn signal switch) and rear body control module (RBCM)

―  Communication error between rear body control module (RBCM) and blind spot monitoring (BSM) control module

―  Blind spot monitoring (BSM) control module malfunction

Diagnostic Procedure

Step	Inspection	Result	Action
1	VERIFY MALFUNCTION SYMPTOM • Blind spot monitoring (BSM) warning light illuminates while under light-off conditions.	Yes	Go to the symptom troubleshooting procedure, “ blind spot monitoring (BSM) warning light illuminates while not under blind spot monitoring (BSM) warning light-off conditions”. (See BLIND SPOT MONITORING (BSM) WARNING LIGHT ILLUMINATES WHILE NOT UNDER LIGHT-ILLUMINATION CONDITIONS [BLIND SPOT MONITORING (BSM) SYSTEM (Australian specs.)].)
1		No	Go to the next step.
2	INSPECT IF MALFUNCTION IS IN REAR BODY CONTROL MODULE (RBCM) INPUT SIGNAL OR BSM • Monitor the following PIDs on the suspected side of the blind spot monitoring (BSM) control module using the M-MDS. (See PID/DATA MONITOR TABLE [BLIND SPOT MONITORING (BSM) CONTROL MODULE (Australian specs.)].) ― TURN_SW_L ― TURN_SW_R • Are the monitoring values normal?	Yes	Replace the blind spot monitoring (BSM) control module. (See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION [Australian specs.].)
2		No	Retrieve DTCs from the start stop unit, instrument cluster, and blind spot monitoring (BSM) control module using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) (See DTC INSPECTION [INSTRUMENT CLUSTER].) (See DTC TABLE [BLIND SPOT MONITORING (BSM) CONTROL MODULE (Australian specs.)].)