NO.4 BSM INDICATOR LIGHT ILLUMINATES WHILE NOT UNDER LIGHT-ILLUMINATION CONDITIONS [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 8-PIN TYPE]

id0903n1990600

4

BSM indicator light illuminates while not under light-illumination conditions

DESCRIPTION

•  The BSM indicator light illuminates, but the conditions to illuminate the BSM indicator light are not satisfied (vehicle speed above 32 km/h {20 mph}, turn signals off, and vehicle in warning zone).

Possible Causes

•  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 (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

•  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	Action
1	VERIFY DTCs • Retrieve DTCs from the BSM control module, BCM, and the PCM using the M-MDS. (See DTC INSPECTION [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 8-PIN TYPE].) (See DTC TABLE [BCM].) (See DTC TABLE [MZI-3.7].) • 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].)
1		No	Go to the next step.
2	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. (See PID/DATA MONITOR INSPECTION [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 8-PIN TYPE].) ― VSPD ― SWA_POS • Are the monitoring values normal?	Yes	Go to Step 5.
2		No	• If the PID_VSPD monitoring value is normal, go the next step. • If the PID_VSPD monitoring value is not normal, go the Step 4.
3	INSPECT VEHICLE SPEED SIGNAL • Monitor the PID VSS for the PCM using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZI-3.7].) • Is the monitoring value 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].)
3		No	Inspect the ABS wheel-speed sensor related parts. (See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.) (See REAR ABS WHEEL-SPEED SENSOR INSPECTION [2WD].) (See REAR ABS WHEEL-SPEED SENSOR INSPECTION [4WD].)
4	INSPECT STEERING ANGLE SIGNAL • Monitor the PID SWA_POS for the DSC/RSC HU/CM using the M-MDS. (See ON-BOARD DIAGNOSIS [DSC/RSC].) • Is the monitoring value normal?	Yes	Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
4		No	• Inspect steering angle signal. (See STEERING ANGLE SENSOR INSPECTION.) • Perform steering angle sensor initialization.
5	INSPECT REAR BUMPER • Inspect the rear bumper at the 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.
5		No	Repair or replace malfunctioning parts, or replace the rear bumper. (See REAR BUMPER REMOVAL/INSTALLATION.)
6	VERIFY THE CONDITION OF THE BSM CONTROL MODULE • Remove the rear bumper. (See REAR BUMPER REMOVAL/INSTALLATION.) • 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.
6		No	Repair or replace the malfunctioning part.
7	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.
7		No	The after-market electrical product is causing the malfunction.
8	INSPECT BSM CONTROL MODULE (RADAR) • Inspect the BSM control module. (See BLIND SPOT MONITORING (BSM) CONTROL MODULE INSPECTION [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 8-PIN TYPE].) • Is the BSM control module normal?	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 [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 8-PIN TYPE].)
8		No	Replace the BSM control module. (See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION [BLIND SPOT MONITORING (BSM) CONTROL MODULE CONNECTOR 8-PIN TYPE].)