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DTC B10AC:23 [START STOP UNIT]

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2016 – MX-5 – Body and Accessories

DTC B10AC:23 [START STOP UNIT]

Description

Cruise control switch circuit malfunction

Detection condition

  • Start stop unit detects any cruise control switch stuck on for 120 s or more with the ignition switched ON (engine off or on).

Fail-safe

Not applicable

Possible cause

  • Instrument cluster configuration error

  • Clock spring connector or terminal malfunction

  • Clock spring malfunction

  • Start stop unit connector or terminal malfunction

  • Short to ground in wiring harness between start stop unit terminal 1Y and clock spring terminal 1J

  • Short to power supply in wiring harness between start stop unit terminal 1Y and clock spring terminal 1J

  • Cruise control switch malfunction

  • Start stop unit malfunction

Diagnostic Procedure

Step

Inspection

Action

1

PERFORM INSTRUMENT CLUSTER CONFIGURATION (USING AS-BUILT DATA)

Yes

Using the M-MDS, perform the instrument cluster configuration (using As-Built data) again, then go to the next step.

(See INSTRUMENT CLUSTER CONFIGURATION (USING AS-BUILT DATA).)

No

Go to Step 9.

2

INSPECT CLOCK SPRING CONNECTOR CONDITION

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the clock spring 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 8.

3

INSPECT CLOCK SPRING

Yes

Go to the next step.

No

Replace the clock spring, then Go to Step 8.

(See CLOCK SPRING REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].)

(See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

4

INSPECT START STOP UNIT CONNECTOR CONDITION

  • Disconnect the start stop unit 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 8.

5

INSPECT CRUISE CONTROL SWITCH CIRCUIT FOR SHORT TO GROUND

  • Verify that the start stop unit and clock spring connectors are disconnected.

  • Inspect for continuity between clock spring terminal 1J (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 start stop unit terminal 1Y and clock spring terminal 1J.

    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

INSPECT CRUISE CONTROL SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY

  • Verify that the start stop unit and clock spring connectors are disconnected.

  • Connect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Switch the ignition ON (engine off or on).

  • Measure the voltage at the clock spring terminal 1J (wiring harness-side).

  • Is the voltage 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between start stop unit terminal 1Y and clock spring terminal 1J.

    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 power supply.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

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

Go to Step 8.

7

INSPECT CRUISE CONTROL SWITCH

Yes

Go to the next step.

No

Replace the cruise control switch, then go to the next step.

(See STEERING SWITCH REMOVAL/INSTALLATION.)

8

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

9

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 [START STOP UNIT].)

No

DTC troubleshooting completed.

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