Knowledge Base

Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
Home

 

< Previous   Next >

DETERMINING OPEN CIRCUIT LOCATION (MS-CAN)

CAUTION:

  • Perform the following malfunction diagnosis only when it is diagnosed with a open circuit by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.)

  • If the malfunctioning part is detected in the communication line, before disconnecting the related connector for inspection, press the connector in the connection direction to verify that there is no looseness or disconnection.

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

1. Verify DTCs of the modules related to the CAN system.
2. Apply the communication error DTC and the failed module to DTC output pattern and malfunctioning location, and select the possible cause for the diagnostic result and the reference for the inspection item. (See DTC Output Pattern And Malfunctioning Location.)

NOTE:

  • The open circuit location can be determined by the DTC indicated in the DTC output pattern and malfunctioning location chart. DTCs not listed in the chart are not used for the determination of the open circuit location. (See DTC Output Pattern And Malfunctioning Location.)

3. Inspect the possible cause and inspection item of the applicable malfunctioning part.
4. After repairs, return to CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW, and verify that the repairs have been completed. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW.)

DTC Output Pattern And Malfunctioning Location

Cross (×): Communication error-related DTC and failed module

M-MDS display

DTC output pattern and malfunctioning location

DTC output module

DTC

IC

(Instrument cluster)

U0232:00

×

×

BSM*1

(Blind spot monitoring (BSM) control module (LH))

U0100:00

×

U0121:00

×

U0155:00

×

U0214:00

×

EATC

(Climate control unit)

U0155:00

×

M-MDS display module

[Fail] display pattern

IC

×

BSM*1

×

×

EATC

×

×

Diagnostic result

Possible cause and inspection item

A

B

C

D

*1
With blind spot monitoring (BSM) system

A

Possible cause

  • Connector terminal disconnection, poor contact, damage, deformation, corrosion

  • Instrument cluster power supply voltage or body ground malfunction

  • Open circuit in wiring harness between instrument cluster and branch A

  • Instrument cluster malfunction

System wiring diagram

Inspection item

  • Instrument cluster power supply voltage-related wiring harness and fuse

  • Instrument cluster body ground related wiring harness

  • Instrument cluster connector

  • Wiring harness between instrument cluster terminal C and branch A

  • Wiring harness between instrument cluster terminal E and branch A

  • Instrument cluster

B

With blind spot monitoring (BSM) system
    Possible cause

  • Connector terminal disconnection, poor contact, damage, deformation, corrosion

  • Open circuit in wiring harness between branch A and connector C-14

  • Open circuit in wiring harness between connector C-14 and branch B

  • Connector C-14 malfunction

System wiring diagram

    Inspection item

  • Connector C-14

  • Wiring harness between branch A and connector C-14

  • Wiring harness between connector C-14 and branch B

Without blind spot monitoring (BSM) system
    Possible cause

  • Connector terminal disconnection, poor contact, damage, deformation, corrosion

  • Climate control unit power supply voltage or body ground malfunction

  • Open circuit in wiring harness between branch A and connector C-14

  • Open circuit in wiring harness between connector C-14 and connector C-14

  • Open circuit in wiring harness between connector C-14 and climate control unit

  • Connector C-14 malfunction

  • Climate control unit malfunction

System wiring diagram

    Inspection item

  • Climate control unit power supply voltage-related wiring harness and fuse

  • Climate control unit body ground related wiring harness

  • Climate control unit connector

  • Connector C-14

  • Wiring harness between branch A and connector C-14

  • Wiring harness between connector C-14 and connector C-14

  • Wiring harness between climate control unit terminal D and connector C-14

  • Wiring harness between climate control unit terminal B and connector C-14

  • Climate control unit

C

Possible cause

  • Connector terminal disconnection, poor contact, damage, deformation, corrosion

  • Blind spot monitoring (BSM) control module (LH) power supply voltage or body ground malfunction

  • Open circuit in wiring harness between blind spot monitoring (BSM) control module (LH) and connector C-26

  • Open circuit in wiring harness between connector C-26 and branch B

  • Connector C-26 malfunction

  • Blind spot monitoring (BSM) control module (LH) malfunction

System wiring diagram

Inspection item

  • Blind spot monitoring (BSM) control module (LH) power supply voltage-related wiring harness and fuse

  • Blind spot monitoring (BSM) control module (LH) body ground related wiring harness

  • Blind spot monitoring (BSM) control module (LH) connector

  • Connector C-26

  • Wiring harness between blind spot monitoring (BSM) control module (LH) terminal D and connector C-26

  • Wiring harness between blind spot monitoring (BSM) control module (LH) terminal E and connector C-26

  • Wiring harness between connector C-26 and branch B

  • Blind spot monitoring (BSM) control module (LH)

D

Possible cause

  • Connector terminal disconnection, poor contact, damage, deformation, corrosion

  • Climate control unit power supply voltage or body ground malfunction

  • Open circuit in wiring harness between branch B and connector C-14

  • Open circuit in wiring harness between connector C-14 and climate control unit

  • Connector C-14 malfunction

  • Climate control unit malfunction

System wiring diagram

Inspection item

  • Climate control unit power supply voltage-related wiring harness and fuse

  • Climate control unit body ground related wiring harness

  • Climate control unit connector

  • Connector C-14

  • Wiring harness between branch B and connector C-14

  • Wiring harness between climate control unit terminal D and connector C-14

  • Wiring harness between climate control unit terminal B and connector C-14

  • Climate control unit

< Previous   Next >
 

Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

COPYRIGHT NOTICE:
This fan site is not affiliated with Mazda, and is intended for personal, or commercial use only. The content of our web pages is for general information purposes only and is presented “as is”. We give no assurance or warranty regarding the accuracy of the contents. Readers should do their due diligence and seek the advice of an appropriately certified automotive technician before attempting any steps on this site. Original content provided by Mazda North America. The content of the manual is copyright under DMCA to: full.metal.resistor@gmail.com
LIMITATION OF LIABILITY:
We accept no responsibility for errors, inaccuracies, or omissions found on these pages. Additionally, we hereby exclude liability for any demands, claims, damages or losses of any kind with regard to any content or information provided on our web-site, including but not limited to incidental or consequential damages, direct or indirect loss, compensatory damages, loss of profits, or otherwise. By using this manual you assume full liablity for any procedures carried out on your vehicle, and are responsible for the vehicle remaining road legal and safe.