BSM INDICATOR LIGHT ILLUMINATES WHILE NOT UNDER LIGHT-ILLUMINATION CONDITIONS [BLIND SPOT MONITORING (BSM)]

id0903d9015300

Description
BSM indicator light illuminates while not under light-illumination conditions
•  The BSM indicator light illuminates, but the conditions to illuminate the BSM indicator light are not satisfied (vehicle speed 10 km/h {6.2 mph} or more, turn signals off, and vehicle in warning zone).
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.
•  The 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 (instrument cluster or EPS control module malfunction)
•  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
•  Malfunction in BSM indicator light related parts
―   Short to power supply circuit in wiring harness between BSM control module and BSM indicator light

Diagnostic Procedure

Step

Inspection

Result

Action
1
INSPECT IF MALFUNCTION IS IN INPUT SIGNAL OR BSM CONTROL MODULE
•  Monitor the following PIDs on the suspected side of the BSM control module using the M-MDS.
―  SWA_POS
•  Are the monitoring values normal?
Yes
Go to Step 3.
No
Go to the next step.
2
INSPECT STEERING ANGLE SIGNAL
•  Monitor the PID STR_ANG for the EPS control module using the M-MDS.
•  Is the monitoring value normal?
Yes
Replace the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No
Replace the EPS control module.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
3
INSPECT REAR BUMPER
•  Inspect the rear bumper at the BSM installation area for the following:
―  Installation condition
―  Sticker adhesion
―  Excessive dirt
―  Repairs using putty
•  Is the rear bumper condition normal?
Yes
Go to the next step.
No
Repair or replace malfunctioning parts, or replace the rear bumper.
(See REAR BUMPER REMOVAL/INSTALLATION.)
4
VERIFY THE CONDITION OF THE BSM CONTROL MODULE
•  Remove the rear bumper.
•  Inspect the BSM control module for the following:
―  Looseness
―  Damage or deformity to the bracket
―  Distortion at vehicle installation surface
•  Is the BSM control module installation condition normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part.
5
VERIFY IF CAUSE OF TROUBLE IS IN AFTER-MARKET ELECTRICAL PRODUCT OR ELSEWHERE
•  Remove the after-market electrical product.
•  Verify that the malfunction symptom recurs as stated by the customer.
•  Does the malfunction symptom recur?
Yes
Go to the next step.
No
The after-market electrical product is causing the malfunction.
6
INSPECT BSM CONTROL MODULE (RADAR)
•  Perform the BSM radar test.
•  Is “TEST PASSED” displayed?
Yes
Temporary malfunction with the radar echo-back.
If the same symptom recurs repeatedly, replace the BSM control module.
(See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION.)
No
Repair or replace malfunctioning part according to inspection result.