Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

DTC B10C7:1F [START STOP UNIT]

< Previous Next >

2016 – MX-5 – Body and Accessories

DTC B10C7:1F [START STOP UNIT]

Description

Keyless antenna (interior, rear) circuit malfunction

Detection condition

  • Start stop unit detects an open circuit or short to ground in the keyless antenna (interior, rear) circuit with the ignition switched off.

Fail-safe

  • Inhibits the door lock/unlock control using the advanced keyless entry system.

Possible cause

  • Keyless antenna (interior, rear) connector or terminal malfunction

  • LF control unit connector or terminal malfunction

  • Short to ground in wiring harness between the following terminals:

    • LF control unit terminal R—Keyless antenna (interior, rear) terminal B

    • LF control unit terminal P—Keyless antenna (interior, rear) terminal A

  • Open circuit in wiring harness between the following terminals:

    • LF control unit terminal R—Keyless antenna (interior, rear) terminal B

    • LF control unit terminal P—Keyless antenna (interior, rear) terminal A

  • LF control unit malfunction

  • Keyless antenna (interior, rear) malfunction

  • Start stop unit malfunction

Diagnostic Procedure

Step

Inspection

Action

1

INSPECT KEYLESS ANTENNA (INTERIOR, REAR) CONNECTOR CONDITION

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the keyless antenna (interior, rear) 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 7.

2

INSPECT LF CONTROL UNIT CONNECTOR CONDITION

  • Disconnect the LF control 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 7.

3

INSPECT KEYLESS ANTENNA (INTERIOR, REAR) CIRCUIT FOR SHORT TO GROUND

  • Verify that the LF control unit and keyless antenna (interior, rear) connectors are disconnected.

  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:

    • Keyless antenna (interior, rear) terminal B

    • Keyless antenna (interior, rear) terminal A

  • Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • LF control unit terminal R—Keyless antenna (interior, rear) terminal B

  • LF control unit terminal P—Keyless antenna (interior, rear) terminal A

    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 Step 7.

No

Go to the next step.

4

INSPECT KEYLESS ANTENNA (INTERIOR, REAR) CIRCUIT FOR OPEN CIRCUIT

  • Verify that the LF control unit and keyless antenna (interior, rear) connectors are disconnected.

  • Inspect for continuity between the following terminals (wiring harness-side):

    • LF control unit terminal R—Keyless antenna (interior, rear) terminal B

    • LF control unit terminal P—Keyless antenna (interior, rear) terminal A

  • Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • LF control unit terminal R—Keyless antenna (interior, rear) terminal B

  • LF control unit terminal P—Keyless antenna (interior, rear) terminal A

    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 an open circuit.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

Go to Step 7.

5

INSPECT LF CONTROL UNIT

Yes

Go to the next step.

No

Replace the LF control unit, then go to Step 7.

(See LF CONTROL UNIT REMOVAL/INSTALLATION.)

6

VERIFY IF MALFUNCTIONING LOCATION IS KEYLESS ANTENNA (INTERIOR, REAR) DEPENDING ON REPEATABILITY

Yes

Replace the keyless antenna (interior, rear), then go to the next step.

(See KEYLESS ANTENNA REMOVAL/INSTALLATION.)

No

Go to Step 8.

7

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

8

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.

< Previous Next >

© 2014 Mazda North American Operations, U.S.A.