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DTC U053B:68 [BCM]

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2016 – MX-5 – Body and Accessories

DTC U053B:68 [BCM]

Description

Error signal received from forward sensing camera (FSC)

Detection condition

  • BCM receives the error signals from the forward sensing camera (FSC) for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe

  • Stop the headlight control done by the high beam control (HBC) system.

Possible cause

  • DTCs are stored in the forward sensing camera (FSC).

  • Forward sensing camera (FSC) malfunction

  • BCM malfunction

System wiring diagram

Not applicable

Diagnostic Procedure

Step

Inspection

Action

1

 VERIFY BCM DTCs AGAIN

  • Clear the DTC for the BCM using the M-MDS.

    (See CLEARING DTC [BCM].)

  • Switch the ignition ON (engine off or on) and wait for 5 s or more.

  • Retrieve the BCM DTCs using the M-MDS.

    (See DTC INSPECTION [BCM].)

  • Is the same DTC displayed?

Yes

Go to the next step.

No

Go to Step 5.

2

 VERIFY FORWARD SENSING CAMERA (FSC) DTCs

Yes

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

(See DTC TABLE [FORWARD SENSING CAMERA (FSC)].)

No

Go to the next step.

3

 VERIFY IF MALFUNCTIONING LOCATION IS FORWARD SENSING CAMERA (FSC) DEPENDING ON REPEATABILITY

  • Clear the DTC for the BCM using the M-MDS.

    (See CLEARING DTC [BCM].)

  • Switch the ignition ON (engine off or on) and wait for 5 s or more.

  • Retrieve the BCM DTCs using the M-MDS.

    (See DTC INSPECTION [BCM].)

  • Is the same DTC displayed?

Yes

Replace the forward sensing camera (FSC), then go to the next step.

(See FORWARD SENSING CAMERA (FSC) REMOVAL/INSTALLATION.)

No

Go to Step 5.

4

 VERIFY THAT REPAIRS HAVE BEEN COMPLETED

  • Clear the DTC for the BCM using the M-MDS.

    (See CLEARING DTC [BCM].)

  • Switch the ignition ON (engine off or on) and wait for 5 s or more.

  • Retrieve the BCM DTCs using the M-MDS.

    (See DTC INSPECTION [BCM].)

  • Is the same DTC displayed?

Yes

Replace the BCM, then go to the next step.

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

No

Go to the next step.

5

 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 [BCM].)

No

DTC troubleshooting completed.

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