NO.6 BSM INDICATOR LIGHT FLASHES WHILE NOT UNDER BSM INDICATOR LIGHT-FLASHING CONDITIONS (NO COMBINATION SWITCH OPERATION (TURN SIGNAL SWITCH)) [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 8-PIN TYPE]

id0903n1990700

6
BSM indicator light flashes while not under BSM indicator light-flashing conditions (no combination switch operation (turn signal switch)
DESCRIPTION
•  The BSM indicator light flashes despite not satisfying the BSM indicator light flashing conditions (vehicle speed above 32 km/h {20 mph}, 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 "No.4 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 BCM and BSM control module, or steering angle sensor 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 (BSM control module mistakenly recognizes vehicle speed as being above 32 km/h {20 mph}
―  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 BCM
―  Communication error between BCM and BSM control module
―  BSM control module malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY MALFUNCTION SYMPTOM
•  BSM indicator light illuminates while under light-off conditions.
Yes
Go to the symptom troubleshooting procedure, "No.4 BSM indicator light illuminates while not under BSM indicator light-off conditions".
(See NO.4 BSM INDICATOR LIGHT ILLUMINATES WHILE NOT UNDER LIGHT-ILLUMINATION CONDITIONS [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 8-PIN TYPE].)
No
Go to the next step.
2
VERIFY DTCs
•  Retrieve DTCs from the BSM control module, BCM, PCM, and TCM using the M-MDS.
•  Are any DTCs displayed?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 8-PIN TYPE].)
(See DTC TABLE [BCM].)
(See DTC TABLE [MZI-3.7].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [AY6A-EL, AY6AX-EL].)
No
Go to the next step.
3
INSPECT IF MALFUNCTION IS IN BCM INPUT SIGNAL OR BSM
•  Monitor the following PIDs on the suspected side of the BSM control module using the M-MDS.
―  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 8-PIN TYPE].)
No
Go to the next step.
4
INSPECT TURN SIGNAL SWITCH SIGNAL
•  Monitor the following BCM PIDs using the M-MDS:
―  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 8-PIN TYPE].)
No
•  Inspect the following. If a malfunction is detected, repair or replace the malfunctioning part.
―  Combination switch (turn signal switch)
―  Wiring harness between combination switch (turn signal switch) and BCM for short to ground circuit
•  If a malfunction is not detected, replace the BCM.