Description

Radar sensor sensitivity temporarily decreases depending on various external and environmental factors (blind spot monitoring (BSM) control module (LH))

Detection condition

• Radar sensor sensitivity in blind spot monitoring (BSM) control module (LH) decreases for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe

• Blind spot monitoring (BSM) system is stopped.

Possible cause

• Rear bumper dirt or foreign material (reflective object) is adhered.

• Dirt or foreign material (reflective object) on blind spot monitoring (BSM) control module (LH)

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

• Blind spot monitoring (BSM) control module (LH) malfunction

System wiring diagram

Not applicable

Step

Inspection

Action

1

• Visually inspect the rear bumper surface for the following:

• Dirt

• Adhered foreign material (reflective object)

• Is there any dirt or foreign matter (reflective object) on the surface of the rear bumper?

Yes

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

No

Go to the next step.

2

• Visually inspect the area around the blind spot monitoring (BSM) control module (LH) for the following:

• Dirt

• Adhered foreign material (reflective object)

• Is there any dirt or foreign matter (reflective object) around the blind spot monitoring (BSM) control module (LH)?

Yes

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

No

Go to the next step.

3

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

• Is the repair or repaint of the rear bumper Mazda genuine?

Yes

Go to the next step.

No

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

(See REAR BUMPER REMOVAL.)

(See REAR BUMPER INSTALLATION.)

4

• Clear the DTC for the blind spot monitoring (BSM) control module using the M-MDS.

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

• Drive the vehicle at 10 km/h {6.2 mph} or more.

• Retrieve the blind spot monitoring (BSM) control module DTCs using the M-MDS.

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

• Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the blind spot monitoring (BSM) control module (LH).

  (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) CONTROL MODULE].)

No

DTC troubleshooting completed.