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DTC B1174:11 [BCM]

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2016 – MX-5 – Body and Accessories

DTC B1174:11 [BCM]

Description

Door lock-link switch (RH) unlock circuit malfunction

Detection condition

  • BCM detects a short to ground in the door lock-link switch (RH) unlock circuit with the door lock-link switch (RH) locked.

Fail-safe

Not applicable

Possible cause

  • Door latch and lock actuator (RH) connector or terminal malfunction

  • Door lock-link switch (RH) malfunction

  • BCM connector or terminal malfunction

  • Short to ground in wiring harness between door latch and lock actuator (RH) terminal L and BCM terminal 2M

  • BCM malfunction

Diagnostic Procedure

Step

Inspection

Action

1

VERIFY BCM DTCs AGAIN

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

    (See CLEARING DTC [BCM].)

  • Lock/unlock all the doors by operating the driver’s door lock knob.

  • Retrieve the BCM DTCs using the M-MDS with the door lock-link switch (RH) not unlocked.

    (See DTC INSPECTION [BCM].)

  • Is the same DTC displayed?

Yes

Go to the next step.

No

Go to Step 7.

2

INSPECT DOOR LATCH AND LOCK ACTUATOR (RH) CONNECTOR CONDITION

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the door latch and lock actuator (RH) connector.

  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.

  • Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

3

INSPECT DOOR LOCK-LINK SWITCH (RH)

Yes

Go to the next step.

No

Replace the door latch and lock actuator (RH), then go to Step 6.

(See DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)

4

INSPECT BCM CONNECTOR CONDITION

  • Disconnect the BCM connector.

  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.

  • Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

5

INSPECT DOOR LOCK-LINK SWITCH UNLOCK CIRCUIT FOR SHORT TO GROUND

  • Verify that the door latch and lock actuator (RH) and BCM connectors are disconnected.

  • Inspect for continuity between door latch and lock actuator (RH) terminal L (wiring harness-side) and body ground.

  • Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between door latch and lock actuator (RH) terminal L and BCM terminal 2M.

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground.

Go to the next step.

No

Go to the next step.

6

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

7

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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