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]

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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))

Description

• The blind spot monitoring (BSM) warning light flashes despite not satisfying the blind spot monitoring (BSM) warning light flashing conditions (vehicle speed above 10 km/h {6.2 mph} (Australian specs.)/30 km/h {19 mph} (except Australian specs.) or more, turn signal on, and vehicle in warning zone).

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

• Both blind spot monitoring (BSM) warning light flashes under conditions other than the RCTA activation conditions (selector lever is in R position and target vehicle detection).

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] 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 instrument cluster, rear body control module (RBCM) and blind spot monitoring (BSM) control module (LH), 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 10 km/h {6.2 mph} (Australian specs.)/30 km/h {19 mph} (except Australian specs.) 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 start stop unit

? Communication error between, instrument cluster, rear body control module (RBCM) and blind spot monitoring (BSM) control module or start stop unit malfunction

? 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].)
1		No	Go to the next step.
2	INSPECT IF MALFUNCTION IS IN START STOP UNIT INPUT SIGNAL OR BSM • Monitor the following PIDs on the start stop unit using the M-MDS. (See PID/DATA MONITOR TABLE [START STOP UNIT].) ? TURN_SW_L ? TURN_SW_R • Are the monitoring values normal?	Yes	Replace the blind spot monitoring (BSM) control module (LH). (See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION.)
2		No	Retrieve DTCs from the start stop unit, instrument cluster, and rear body control module (RBCM) using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) (See DTC INSPECTION [INSTRUMENT CLUSTER].) (See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].)