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DETERMINING SHORT TO POWER SUPPLY 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.

  • Disconnect the negative battery cable before performing any work that requires handling of connectors.

Step

Inspection

Action

1

 INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-40 AND INSTRUMENT CLUSTER

Yes

Go to Step 3.

No

Go to the next step.

2

 INSPECT INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY

Yes

Replace the instrument cluster because there is a short to the power supply in the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

No

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

3

 INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTORS C-40 AND DLC-2

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

  • Is the voltage 0 V?

Yes

Go to the next step.

No

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

4

 INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-40 AND CONNECTOR C-14

Yes

Go to the next step.

No

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

5

 INSPECT FOR SHORT TO POWER SUPPLY BETWEEN CONNECTOR C-14 AND CLIMATE CONTROL UNIT

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

  • Is the voltage between 1.5—3.5 V?

Yes

Go to the next step.

No

Go to Step 8.

6

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

Yes

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

No

Go to the next step.

7

 INSPECT BLIND SPOT MONITORING (BSM) CONTROL MODULE (LH) FOR SHORT TO POWER SUPPLY

Yes

Replace the blind spot monitoring (BSM) control module (LH) because there is a short to power supply in the blind spot monitoring (BSM) control module (LH).

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

No

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 to the power supply.

8

 INSPECT CLIMATE CONTROL UNIT FOR SHORT TO POWER SUPPLY

Yes

Replace the climate control unit because there is a short to the power supply in the climate control unit.

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

(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

No

Repair or replace the wiring harness between the climate control unit and connector C-14 because the wiring harness is shorted to the power supply.
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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