BSM INDICATOR LIGHT FLASHES WHILE NOT UNDER BSM INDICATOR LIGHT-FLASHING CONDITIONS (NO LIGHT SWITCH OPERATION (TURN SIGNAL SWITCH)) [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 10-PIN TYPE]

id0903n2015500

Description | BSM indicator light flashes while not under BSM indicator light-flashing conditions (no combination switch operation (turn signal switch)
• The BSM indicator light flashes despite not satisfying the BSM indicator light flashing conditions (vehicle speed 10 km/h {6.2 mph} or more, turn signal on, and vehicle in warning zone)). • The BSM indicator light flashes, but the turn signals are off.
Possible Causes | Note • This malfunction symptom is basically the same as symptom “BSM indicator light while not under BSM indicator light-illumination conditions”. • BSM control module recognizes a vehicle as being inside the warning zone when it is actually outside of it. ― Radar (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 body control module (BCM) and BSM control module. • Problem with rear bumper such as dirt on 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 (BSM control module mistakenly recognizes vehicle speed as being 10 km/h {6.2 mph} or more ― PCM communication error with BSM control module ― Malfunction in ABS wheel speed sensor related parts • 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 body control module (BCM) ― Communication error between body control module (BCM) and BSM control module ― BSM control module malfunction

Diagnostic Procedure

Step | Inspection | Result | Action
--- | --- | --- | ---
1 | VERIFY MALFUNCTION SYMPTOM • BSM indicator light illuminates while under light-off conditions. | Yes | Go to the symptom troubleshooting procedure, “ BSM indicator light illuminates while not under BSM indicator light-off conditions”. (See BSM INDICATOR LIGHT ILLUMINATES WHILE NOT UNDER LIGHT-ILLUMINATION CONDITIONS [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 10-PIN TYPE].)
No | Go to the next step.
2 | INSPECT IF MALFUNCTION IS IN BODY CONTROL MODULE (BCM) INPUT SIGNAL OR BSM • Monitor the following PIDs on the suspected side of the BCM using the M-MDS. (See PID/DATA MONITOR INSPECTION [BCM].) ― TURN_SW_L ― TURN_SW_R • Are the monitoring values normal? | Yes | Replace the BSM control module. (See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 10-PIN TYPE].)
No | Retrieve DTCs from the BCM, instrument cluster, and BSM control module using the M-MDS. (See DTC INSPECTION [BCM].) (See DTC INSPECTION [INSTRUMENT CLUSTER].) (See DTC INSPECTION [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 10-PIN TYPE].)