Description

Radar performance malfunction

Detection condition

• BSM control module internal radar sensor sensitivity is decreased.

• BSM control module internal radar sensor axis is deviated.

Fail-safe function

• Blind spot monitoring (BSM) system is stopped.

Possible cause

• Rear bumper malfunction (Dirt or foreign matter (reflective object) is adhered.)

• BSM control module malfunction (Dirt or foreign matter (reflective object) is adhered.)

• Concavity and convexity on the surface of the repaired rear bumper

• BSM control module malfunction

System wiring diagram

Not applicable

Step

Inspection

Action

1

• Visually inspect the rear bumper surface for the following:

• Dirt

• Adhered foreign matter (reflective object)

• Is the rear bumper normal?

Yes

Go to the next step.

No

Remove dirt or foreign matter (reflective object), then go to Step 4.

2

• Visually inspect the area around the BSM control module for the following:

• Dirt

• Adhered foreign matter (reflective object)

• Is the area around the BSM control module normal?

Yes

Go to the next step.

No

Remove dirt or foreign matter (reflective object), then go to Step 4.

3

• Verify if the rear bumper had been repaired or repainted before.

• Is the paint Mazda genuine?

Yes

Go to the next step.

No

Replace the rear bumper, then go to the next step.

(See REAR BUMPER REMOVAL/INSTALLATION.)

4

• Clear the DTC for the BSM control module using the M-MDS.

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

• Retrieve the BSM control module DTCs using the M-MDS.

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

• Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the BSM control module.

  (See BLIND SPOT MONITORING (BSM) CONTROL MODULE REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

5

• Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

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

No

DTC troubleshooting completed.