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 / Safety Systems / 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) Off Switch Removal/Installation
1. Disconnect the negative battery cable.. 2. Remove the switch panel in the direction of the arrow shown in the figure. 3. Disconnect the connector. 4. Remove the BSM OFF switch in the dir ...

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:

Initial Learning [Fw6 A EL]
Introduction If the control valve body and oil pressure switch are replaced, always perform the initial learning. If the initial learning is not completed, engine rev-up may occur or shift shock may increase. DTC P06B8:00 is displayed while the initial learning has not been implement ...

Event Data Recorder
This vehicle is equipped with an event data recorder (EDR). The main purpose of an EDR is to record, in certain crash or near crash-like situations, such as an air bag deployment or hitting a road obstacle, data that will assist in understanding how a vehicle’s systems performed. The EDR is ...

Joint Shaft Removal/Installation [Skyactiv G 2.0]
CAUTION: Performing the following procedures without first removing the ABS wheel-speed sensor may possibly cause an open circuit in the wiring harness if it is pulled by mistake. Before performing the following procedures, remove the ABS wheel-speed sensor connector (axle side) and ...

© 2016-2018 Copyright www.mazda3tech.com