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DTC U1A4B:54 [BLIND SPOT MONITORING (BSM) CONTROL MODULE]

CAUTION:

  • When replacing a blind spot monitoring (BSM) control module (RH) having any of the following part numbers, it is necessary to replace the blind spot monitoring (BSM) control module (LH) at the same time to perform the configuration normally.

    • N243-67Y80 A

    • N243-67Y80 B

    • N243-67Y80 C

Description

Radar aiming is not performed or radar sensor axis is deviated (blind spot monitoring (BSM) control module (RH))

Detection condition

  • Malfunction in radar aiming of the blind spot monitoring (BSM) control module (RH) detected for 1 s or more with the ignition switched ON (engine off or on).

Fail-safe

  • Blind spot monitoring (BSM) system is stopped.

Possible cause

  • Blind spot monitoring (BSM) radar aiming (RH) was not performed.

  • Deviation of blind spot monitoring (BSM) control module (RH) radar sensor axis

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

System wiring diagram

Not applicable
Diagnostic Procedure

Step

Inspection

Action

1

 PERFORM BLIND SPOT MONITORING (BSM) CONTROL MODULE (RH) RADAR AIMING

Yes

Perform the blind spot monitoring (BSM) control module (RH) radar aiming again, then go to the next step.

(See BLIND SPOT MONITORING (BSM) RADAR AIMING.)

No

Go to Step 3.

2

 VERIFY THAT REPAIRS HAVE BEEN COMPLETED

Yes

Replace the blind spot monitoring (BSM) control module, then go to the next step.

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

No

Go to the next step.

3

 VERIFY IF OTHER DTCs DISPLAYED

  • 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.
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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