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DETERMINING SHORT BETWEEN CIRCUITS LOCATION (HS-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 BETWEEN BCM AND INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS

Yes

Go to Step 8.

No

Go to the next step.

2

 INSPECT BCM FOR SHORT BETWEEN CIRCUITS

Yes

Replace the BCM because there is a short between circuits in the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

Go to the next step.

3

 INSPECT BETWEEN CONNECTORS C-38 AND C-39 AND BCM FOR SHORT BETWEEN CIRCUITS

  • Connect the connector 2 and 3 which has BCM terminals 3C,3D and 2D,2C.

  • Disconnect the connectors C-38 and C-39.

  • Connect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Switch the ignition ON (engine off).

  • Measure the voltage at DLC-2 terminals F and E.

  • Is the voltage at DLC-2 terminals F and E the same?

Yes

Repair or replace the wiring harness between the connectors C-38 and C-39 and BCM because the wiring harness is shorted between circuits.

No

Go to the next step.

4

 INSPECT DSC HU/CM FOR SHORT BETWEEN CIRCUITS

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the DSC HU/CM connector.

  • Inspect for continuity between DSC HU/CM terminals C and D (wiring harness side).

  • Is there continuity?

Yes

Go to the next step.

No

Replace the DSC HU/CM because there is a short between circuits in the DSC HU/CM.

(See DSC HU/CM REMOVAL/INSTALLATION.)

5

 INSPECT EEVP CONTROL UNIT FOR SHORT BETWEEN CIRCUITS

  • Disconnect the EVP control unit connector.

  • Inspect for continuity between EVP control unit terminals AD and Z (wiring harness side).

  • Is there continuity?

Yes

Go to the next step.

No

Replace the EVP control unit because there is a short between circuits in the EVP control unit.

(See EVP CONTROL UNIT REMOVAL/INSTALLATION.)

6

 INSPECT EPS CONTROL MODULE FOR SHORT BETWEEN CIRCUITS

  • Disconnect the EPS control module connector.

  • Inspect for continuity between EPS control module terminals 2B and 2C (wiring harness side).

  • Is there continuity?

Yes

Go to the next step.

No

Replace the EPS control module because there is a short between circuits in the EPS control module.

(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)

7

 INSPECT PCM FOR SHORT BETWEEN CIRCUITS

  • Disconnect the PCM connector.

  • Inspect for continuity between PCM terminals 2AK and 2AL (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the PCM and connectors C-38 and C-39 because the wiring harness is shorted between circuits.

No

Replace the PCM because there is a short between circuits in the PCM.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

8

 INSPECT BETWEEN CONNECTOR C-42 AND INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS

Yes

Go to Step 12.

No

Go to the next step.

9

 INSPECT BETWEEN AUDIO AMPLIFIER AND CONNECTOR C-42 FOR SHORT BETWEEN CIRCUITS

Yes

Go to the next step.

No

Go to Step 11.

10

 INSPECT AUDIO AMPLIFIER FOR SHORT BETWEEN CIRCUITS

  • Disconnect the audio amplifier connector.

  • Inspect for continuity between audio amplifier terminals 2L and 2N (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the audio amplifier and connector C-42 because the wiring harness is shorted between circuits.

No

Replace the audio amplifier because there is a short between circuits in the audio amplifier.

(See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)

11

 INSPECT TCM FOR SHORT BETWEEN CIRCUITS

  • Disconnect the TCM connector.

  • Inspect for continuity between TCM terminals 2G and 2C (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the TCM and BCM and connector C-42 because the wiring harness is shorted between circuits.

No

Replace the TCM because there is a short between circuits in the TCM.

(See CONTROL VALVE BODY REMOVAL [SJ6A-EL].)

(See CONTROL VALVE BODY INSTALLATION [SJ6A-EL].)

12

 INSPECT BETWEEN CONNECTOR C-25 AND INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS

Yes

Go to Step 15.

No

Go to the next step.

13

 INSPECT BETWEEN CONNECTOR C-30 AND CONNECTOR C-42 and CONNECTOR C-25 FOR SHORT BETWEEN CIRCUITS

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the connector C-30.

  • Inspect for continuity between occupant classification sensor terminals 4B and 4A.

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness between the connector C-30 and connector C-42 and connector C-25 because the wiring harness is shorted between circuits.

14

 INSPECT OCCUPANT CLASSIFICATION SENSOR FOR SHORT BETWEEN CIRCUITS

  • Disconnect the occupant classification sensor connector.

  • Inspect for continuity between occupant classification sensor terminals 4B and 4A (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the occupant classification sensor and connector C-30 because the wiring harness is shorted between circuits.

No

Replace the occupant classification sensor because there is a short between circuits in the occupant classification sensor.

(See OCCUPANT CLASSIFICATION SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

15

 INSPECT BETWEEN CONNECTOR C-14 AND INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS

Yes

Go to the next step.

No

Repair or replace the wiring harness between the connector C-25 and connector C-14 because the wiring harness is shorted between circuits.

16

 INSPECT BETWEEN CONNECTOR C-17 AND INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS

Yes

Go to Step 19.

No

Go to the next step.

17

 INSPECT BETWEEN FORWARD SENSING CAMERA (FSC) AND CONNECTOR C-17 FOR SHORT BETWEEN CIRCUITS

Yes

Go to the next step.

No

Repair or replace the wiring harness between the connector C-14 and connector C-17 because the wiring harness is shorted between circuits.

18

 INSPECT FORWARD SENSING CAMERA (FSC) FOR SHORT BETWEEN CIRCUITS

  • Disconnect the forward sensing camera (FSC) connector.

  • Inspect for continuity between forward sensing camera (FSC) terminals E and C (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the forward sensing camera (FSC) and connector C-17 because the wiring harness is shorted between circuits.

No

Replace the forward sensing camera (FSC) because there is a short between circuits in the forward sensing camera (FSC).

(See FORWARD SENSING CAMERA (FSC) REMOVAL/INSTALLATION.)

19

 INSPECT BETWEEN CONNECTOR C-41 AND DLC-2 FOR SHORT BETWEEN CIRCUITS

Yes

Repair or replace the wiring harness between connector C-41 and DLC-2 because the wiring harness is shorted between circuits.

No

Go to the next step.

20

 INSPECT BETWEEN AFS CONTROL MODULE / AUTO LEVELING CONTROL MODULE AND CONNECTOR C-17 AND CONNECTOR C-41 FOR SHORT BETWEEN CIRCUITS

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Inspect for continuity between AFS control module / auto leveling control module terminals A and B.

  • Is there continuity?

Yes

Go to the next step.

No

Go to Step 22.

21

 INSPECT AFS CONTROL MODULE / AUTO LEVELING CONTROL MODULE FOR SHORT BETWEEN CIRCUITS

  • Disconnect the AFS control module / auto leveling control module connector.

  • Inspect for continuity between AFS control module / auto leveling control module terminals A and B (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the AFS control module / auto leveling control module and connector C-41 and connector C-17 because the wiring harness is shorted between circuits.

No

Replace the AFS control module / auto leveling control module because there is a short between circuits in the AFS control module / auto leveling control module.

(See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)

(See ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE REMOVAL/INSTALLATION.)

22

 INSPECT BETWEEN START STOP UNIT AND CONNECTOR C-41 FOR SHORT BETWEEN CIRCUITS

Yes

Go to the next step.

No

Go to Step 25.

23

 INSPECT BETWEEN START STOP UNIT AND CONNECTOR C-19 FOR SHORT BETWEEN CIRCUITS

  • Disconnect the connector C-19.

  • Inspect for continuity between start stop unit terminals 2M and 2O.

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness between the connector C-19 and connector C-41 because the wiring harness is shorted between circuits.

24

 INSPECT START STOP UNIT FOR SHORT BETWEEN CIRCUITS

  • Disconnect the start stop unit connector.

  • Inspect for continuity between start stop unit terminals 2M and 2O (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the start stop unit and connector C-19 because the wiring harness is shorted between circuits.

No

Replace the start stop unit because there is a short between circuits in the start stop unit.

(See START STOP UNIT REMOVAL/INSTALLATION.)

25

 INSPECT BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND CONNECTO C-41 FOR SHORT BETWEEN CIRCUITS

  • Inspect for continuity between connectivity master unit (CMU) terminals 2E and 2F.

  • Is there continuity?

Yes

Go to the next step.

No

Go to Step 27.

26

 INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR SHORT BETWEEN CIRCUITS

  • Disconnect the connectivity master unit (CMU) connector.

  • Inspect for continuity between connectivity master unit (CMU) terminals 2E and 2F (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the connectivity master unit (CMU) and connector C-41 because the wiring harness is shorted between circuits.

No

Replace the connectivity master unit (CMU) because there is a short between circuits in the connectivity master unit (CMU).

(See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION.)

27

 INSPECT BETWEEN CONNECTOR C-41 AND INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS

  • Connect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Switch the ignition ON (engine off).

  • Measure the voltage at instrument cluster terminals B and D.

  • Is the voltage instrument cluster terminals B and D the same?

Yes

Go to the next step.

No

Go to Step 29.

28

 INSPECT INSTRUMENT CLUSTER FOR SHORT BETWEEN CIRCUITS

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Connect the connector C-41.

  • Disconnect the instrument cluster connector.

  • Inspect for continuity between DLC-2 terminals F and E.

  • Is there continuity?

Yes

Repair or replace the wiring harness between the instrument cluster and connector C-41 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.)

29

 INSPECT SAS CONTORL MODULE FOR SHORT BETWEEN CIRCUITS

  • Disconnect the SAS control module connector.

  • Inspect for continuity between SAS control module terminals 3Q and 3S (wiring harness side).

  • Is there continuity?

Yes

Repair or replace the wiring harness between the SAS control module and connector C-41 because the wiring harness is shorted between circuits.

No

Replace the SAS control module because there is a short between circuits in the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

(See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].)
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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