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Mazda CX-5 Service & Repair Manual: Bsm Indicator Light Does Not Flash While Under Bsm Indicator Light Flashing Conditions (With Combination Switch Operation (Turn Signal Switch)) [Blind Spot Monitoring (Bsm)]

Mazda CX-5 Service & Repair Manual / Body / Lighting & Horn / Exterior / Sensors, Switches, Relays / Bsm Indicator Light Does Not Flash While Under Bsm Indicator Light Flashing Conditions (With Combination Switch Operation (Turn Signal Switch)) [Blind Spot Monitoring (Bsm)]


Description

BSM indicator light does not flash while under BSM indicator light-flashing conditions (with combination switch operation (turn signal switch))

  • The BSM indicator light does not flash or illuminate continuously, but the conditions to flash the BSM indicator light are satisfied (vehicle speed above 32 km/h {20 mph} or more, turn signal on, and vehicle in warning zone).

  • BSM indicator light does not flash or illuminate continuously, but turn signals are off.

Possible Causes

NOTE:

  • This malfunction symptom is basically the same as symptom “BSM indicator light does not illuminate while under BSM indicator light-illumination conditions”.

  • The BSM control module mistakenly recognizes a vehicle as being outside of the warning zone when it is actually inside of it.

    • Radar (BSM control module integrated) is not emitted inside of warning zone (unable to emit radar inside warning zone)

      • Damage, deformity or looseness to installation bracket or vehicle frame (including moderate impacts).

      • Malfunction in steering angle signal (communication error between rear body control module (RBCM) and BSM control module, 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.

    • BSM control module does not receive echo-back correctly

      • BSM control module (radar) malfunction

      • Problem with rear bumper such as soiling to radar emitting/receiving area, application of stickers (including transparent types), repairs using putty application.

        NOTE:

        • Rear bumper problems such defective installation of rear bumper, excessive soiling on radar emitting/receiving area, sticker adhesion (including transparent types), repairs to rear bumper using putty.

        • Non-genuine bumper or paint, or installation of after-market parts negatively affecting radar echo-back ability.

    • After-market electrical parts interfere with BSM system

  • BSM does not recognize vehicle speed correctly (BSM control module mistakenly recognizes vehicle speed as being within 32 km/h {20 mph} or more)

    • PCM communication error with BSM control module

    • Malfunction in ABS wheel speed sensor related parts

  • Malfunction in BSM indicator light related parts

    • Open circuit in wiring harness between BSM indicator light and BSM control module

    • Open circuit in wiring harness or poor ground between BSM control module and ground

    • BSM indicator light malfunction

  • Signal is not input for turn signal

    • Combination switch (turn signal switch) malfunction

    • Open circuit in wiring harness between combination switch (turn signal switch) and rear body control module (RBCM)

    • Communication error between rear body control module (RBCM) 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 next step.

No

Go to the symptom troubleshooting procedure, ”BSM indicator light does not illuminate while under BSM indicator light-illumination conditions”.

(See BSM INDICATOR LIGHT DOES NOT ILLUMINATE WHILE UNDER BSM INDICATOR LIGHT-ILLUMINATION CONDITIONS [BLIND SPOT MONITORING (BSM)].)

2

    INSPECT IF MALFUNCTION IS IN REAR BODY CONTROL MODULE (RBCM) INPUT SIGNAL OR BSM

  • Monitor the following PIDs on the suspected side of the BSM control module using the M-MDS.

    (See PID/DATA MONITOR TABLE [BLIND SPOT MONITORING (BSM)].)

    • 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.)

No

Retrieve DTCs from the start stop unit, instrument cluster, and BSM control module using the M-MDS.

(See DTC INSPECTION [START STOP UNIT].)

(See DTC INSPECTION [INSTRUMENT CLUSTER].)

(See DTC INSPECTION [BLIND SPOT MONITORING (BSM)].)


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