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DETERMINING SHORT BETWEEN CIRCUITS LOCATION (MS-CAN)

CAUTION:

System Wiring Diagram

Determination Procedure

CAUTION:

  • When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.

  • When inspecting the DLC-2, touch it with a paper clip or similar thin pin without directly inserting a tester into the terminals.

Step

Inspection

Action

1

 INSPECT BETWEEN INSTRUMENT CLUSTER AND CONNECTOR C-40 FOR SHORT BETWEEN CIRCUITS

Yes

Go to the next step.

No

Go to Step 3.

2

 INSPECT INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the instrument cluster connector.

  • Inspect for continuity between instrument cluster terminals C and E (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the instrument cluster and connector C-40 because the wiring harness is shorted between circuits.

No

Replace the instrument cluster because there is a short between circuits in the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

3

 INSPECT BETWEEN CONNECTOR C-40 AND DLC-2 FOR SHORT BETWEEN CIRCUITS

Yes

Repair or replace the wiring harness between connector C-40 and DLC-2 because the wiring harness is shorted between circuits.

No

Go to the next step.

4

 INSPECT BETWEEN CONNECTOR C-40 AND CONNECTOR C-14 FOR SHORT BETWEEN CIRCUITS

  • Disconnect the connector C-14.

  • Connect the connector C-40.

  • Connect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Switch the ignition ON (engine off).

  • Measure the voltage at DLC-2 terminals L and K.

  • Is the voltage at DLC-2 terminals L and K the same?

Yes

Repair or replace the wiring harness between connector C-40 and connector C-14 because the wiring harness is shorted between circuits.

No

Go to the next step.

5

 INSPECT BETWEEN CLIMATE CONTROL UNIT AND CONNECTOR C-14 FOR SHORT BETWEEN CIRCUITS

  • Measure the voltage at climate control unit terminals D and B.

  • Is the voltage at climate control unit terminals D and B the same?

Yes

Go to Step 8.

No

Go to the next step.

6

 INSPECT BETWEEN BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) AND CONNECTOR C-26 FOR SHORT BETWEEN CIRCUITS

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the connector C-26.

  • Inspect the continuity between blind spot monitoring (BSM) control module (LH) terminals D and E.

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness between connector C-14 and connector C-26 because the wiring harness is shorted between circuits.

7

 INSPECT BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) FOR SHORT BETWEEN CIRCUITS

  • Disconnect the blind spot monitoring (BSM) control module (LH) connector.

  • Inspect for continuity between blind spot monitoring (BSM) control module (LH) terminals D and E (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the blind spot monitoring (BSM) control module (LH) and connector C-26 because the wiring harness is shorted between circuits.

No

Replace the blind spot monitoring (BSM) control module (LH) because there is a short between circuits in the blind spot monitoring (BSM) control module (LH).

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

8

 INSPECT CLIMATE CONTROL UNIT FOR SHORT BETWEEN CIRCUITS

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the climate control unit connector.

  • Inspect for continuity between climate control unit terminals D and B (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the climate control unit and connector C-14 because the wiring harness is shorted between circuits.

No

Replace the climate control unit because there is a short between circuits inside the climate control unit.

(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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