Mazda 3 manuals

Mazda 3 Service Manual: 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)]

Mazda 3 Service Manual / Accessories / Storage / 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)]


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} or more, 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} or more

    • 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

Result

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)].)

No

Go to the next step.

2

    VERIFY DTCs

  • Retrieve DTCs from the BSM control module, BCM, DSC HU/CM, PCM, and TCM using the M-MDS.

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

    (See DTC INSPECTION [BCM].)

    (See ON-BOARD DIAGNOSTIC TEST [MZR 2.0, MZR 2.5].)

    (See ON-BOARD DIAGNOSTIC TEST [MZR 2.3 DISI Turbo].)

    (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].)

    (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FW6A-EL].)

    (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

  • Are any DTCs displayed?

Yes

Go to the applicable DTC inspection.

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

(See DTC TABLE [BCM].)

(See DTC TABLE [MZR 2.0, MZR 2.5].)

(See DTC TABLE [MZR 2.3 DISI Turbo].)

(See DTC TABLE [SKYACTIV-G 2.0].)

(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FW6A-EL].)

(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)

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.

    (See PID/DATA MONITOR INSPECTION [BCM].)

    • 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

Go to the next step.

4

    INSPECT TURN SIGNAL SWITCH SIGNAL

  • Monitor the following BCM PIDs using the M-MDS:

    (See PID/DATA MONITOR INSPECTION [BCM].)

    • 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

  • Inspect the following. If a malfunction is detected, repair or replace the malfunctioning part.

    • Combination switch (turn signal switch)

      (See LIGHT SWITCH REMOVAL/INSTALLATION.)

    • Wiring harness between combination switch (turn signal switch) and BCM for short to ground circuit

  • If a malfunction is not detected, replace the BCM.

    (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)


Blind Spot Monitoring (Bsm) Indicator Light Removal/Installation
NOTE: The BSM indicator light is integrated with the outer mirror glass. 1. Remove the outer mirror glass.. ...

No.7 Bsm Indicator Light Does Not Flash While Under Bsm Indicator Light Flashing Conditions (With Combination Switch Operation (Turn Signal Switch)) [Blind Spot Monitoring (Bsm)]
7 BSM indicator light does not flash while under BSM indicator light-flashing conditions (with combination switch operation (turn signal switch)) Desc ...

Other materials:

How to Use Stitcher™* Radio
What is Stitcher™ Radio? Stitcher™ radio is an application which can be used to listen to Internet radio or stream podcasts. Recommended content is automatically selected by registering content which you put into your favorites, or by pressing the Like or Dislike button. For details on ...

Rearview Mirror Removal
1. Insert a tape-wrapped flathead screwdriver to the position shown in the figure and press the center part of the spring in the direction of arrows (1), and then pull out the rearview mirror in the direction of arrows (2) shown in the figure. CAUTION: When removing the rearview m ...

Crankshaft Position (CKP) Sensor Inspection [Mzr 2.0, Mzr 2.5]
Visual Inspection CAUTION: When foreign material such as an iron chip is on the CKP sensor, it can cause abnormal output from the sensor because of flux turbulence and adversely affect the engine control. Be sure there is no foreign material on the CKP sensor when replacing. ...

© 2016-2025 Copyright www.mazda3tech.com