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

id1503a3021200

Item
BLIND SPOT MONITORING (BSM) WARNING LIGHT ILLUMINATES WHILE NOT UNDER LIGHT-ILLUMINATION CONDITIONS
Description
•  The blind spot monitoring (BSM) warning light illuminates, but the conditions to illuminate the blind spot monitoring (BSM) warning light are not satisfied (vehicle speed above 10 km/h {6.2 mph} (Australian specs.)/30 km/h {19 mph} (except Australian specs.) 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 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 (instrument cluster, rear body control module (RBCM) 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 blind spot monitoring (BSM) system
•  Malfunction in blind spot monitoring (BSM) warning light related parts
?   Short to power supply circuit in wiring harness between blind spot monitoring (BSM) control module and blind spot monitoring (BSM) warning light

Diagnostic Procedure

Step

Inspection

Result

Action
1
INSPECT IF MALFUNCTION IS IN INPUT SIGNAL OR BLIND SPOT MONITORING (BSM) CONTROL MODULE
•  Monitor the following PIDs on the suspected side of the blind spot monitoring (BSM) control module (LH) 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
Retrieve DTCs from the instrument cluster and rear body control module (RBCM) using the M-MDS.
(See DTC INSPECTION [INSTRUMENT CLUSTER].)
(See DTC INSPECTION [REAR BODY CONTROL MODULE (RBCM)].)
No
Replace the EPS control module.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
3
INSPECT REAR BUMPER
•  Inspect the rear bumper at the blind spot monitoring (BSM) installation area for the following:
?  Installation condition
?  Sticker adhesion
?  Excessive soiling
?  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 BLIND SPOT MONITORING (BSM) CONTROL MODULE
•  Remove the rear bumper.
•  Inspect the blind spot monitoring (BSM) control module for the following:
?  Looseness
?  Damage or deformity to the bracket
?  Distortion at vehicle installation surface
•  Is the blind spot monitoring (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 BLIND SPOT MONITORING (BSM) CONTROL MODULE (RADAR)
•  Perform the blind spot monitoring (BSM) radar test.
•  Is “TEST PASSED” displayed?
Yes
Temporary malfunction with the radar echo-back.
If the same symptom recurs repeatedly, replace the blind spot monitoring (BSM) control module.
(See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION.)
No
Repair or replace malfunctioning part according to inspection result.
(See BLIND SPOT MONITORING (BSM) RADAR TEST.)