Knowledge Base

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

Outline

  • A control area network (CAN) system has been adopted in which the multiple control modules send/receive signals using two common communication lines.

  • Local CAN, ISO communication, or LIN communication has been adopted for the individual communication between control modules in consideration of the communication speed and the cost.

System Wiring Diagram

NOTE:

  • The following figure shows the CAN/LIM communication/ISO communication/local CAN connection conditions. Availability depends on the vehicle specification.

CAN/LIN communication/ISO communication

Local CAN

Structural view

Function

CAN (controller area network) system

  • HS-CAN (high-speed controller area network) is used for communication between the following modules:

    • PCM

    • DSC HU/CM

    • EVP control unit

    • EPS control module

    • BCM

    • TCM (AT)

    • Audio amplifier (With Bose® type audio)

    • Occupant classification sensor (with occupant classification sensor)

    • Forward sensing camera (FSC) (With forward sensing camera (FSC))

    • Adaptive front lighting system (AFS) control module / auto leveling control module

    • Start stop unit

    • Connectivity master unit (CMU) (with center display)

    • SAS control module

    • Instrument cluster

  • MS-CAN (mid-speed controller area network) is used for communication between the following modules:

    • Instrument cluster

    • Blind spot monitoring (BSM) control module (LH) (with blind spot monitoring (BSM) system)

    • Climate control unit (full-auto air conditioner)

    • Climate control unit (Manual air conditioner)

  • Signals transmitted using the CAN system are as follows:

HS-CAN communication tableOUT: Output (sends signal)IN: Input (receives signal)

Signal

CAN system related module

PCM

TCM

Adaptive front lighting system (AFS) control module /

auto leveling control module

DSC HU/CM

EVP control unit

EPS control module

BCM

Forward sensing camera (FSC)

Instrument cluster

Start stop unit

SAS control module

Occupant classification sensor

Connectivity master unit (CMU)

Audio amplifier

Acceleration signal status

–

–

–

IN

–

–

–

–

–

–

OUT

–

–

–

Accelerator pedal opening angle information

OUT

–

–

IN

–

IN

IN

–

–

–

IN

–

IN

IN

AFS (adaptive front lighting system) OFF switch status

–

–

IN

–

–

–

–

–

OUT

–

–

–

–

–

AFS (adaptive front lighting system) level configuration

–

–

OUT

–

–

–

–

–

IN

–

–

–

IN

–

AFS (adaptive front lighting system) warning status

–

–

OUT

–

–

–

–

–

IN

–

–

–

IN

–

Air bag/front seat belt pre-tensioner system warning light on request

–

–

–

IN

–

–

IN

–

OUT

IN

IN

–

IN

–

–

–

–

–

–

–

–

–

IN

–

OUT

–

IN

–

Air bag system warning buzzer on request

–

–

–

–

–

–

–

–

IN

–

OUT

–

IN

–

Air bag system-related information

–

–

–

–

–

–

–

–

IN

–

OUT

–

IN

–

AT shift position

IN

OUT

–

–

–

–

–

–

–

–

–

–

–

–

Air conditioner signal

OUT

–

–

–

–

–

–

–

IN

–

–

–

–

–

AT gear position

–

OUT

–

–

–

–

–

–

IN

–

–

–

IN

–

AT/MT gear position

–

OUT

–

–

–

–

–

–

IN

–

–

–

IN

–

Ambient temperature

IN

IN

IN

IN

IN

IN

IN

–

OUT

IN

IN

–

IN

IN

OUT

IN

–

IN

–

–

IN

–

IN

–

IN

–

IN

–

Audio configuration information

IN

–

IN

IN

–

IN

IN

–

OUT

IN

–

–

IN

IN

A/C operation signal

IN

–

–

–

–

–

–

–

OUT

–

–

–

IN

–

Alarm status

–

–

–

–

–

–

OUT

–

IN

–

–

–

IN

–

Brake fluid level

–

–

–

–

–

–

OUT

–

IN

–

–

–

IN

–

Battery discharge suppression status

–

–

–

–

–

–

OUT

–

IN

–

–

–

IN

–

Battery charge status

IN

–

IN

IN

IN

IN

IN

–

OUT

IN

IN

–

IN

IN

Battery regeneration status

OUT

–

–

–

–

–

–

–

–

IN

–

–

IN

–

Blower motor relay status

–

–

–

–

–

–

OUT

–

IN

–

–

–

–

–

Back-up light on request

–

–

IN

IN

–

–

IN

–

OUT

–

–

–

IN

–

Brake switch status

OUT

–

–

–

–

–

–

–

–

IN

–

–

IN

–

Brake switch (No.1) signal

OUT

IN

–

IN

IN

–

IN

IN

IN

–

–

–

IN

–

Brake switch (No.2) signal

OUT

IN

–

–

–

–

–

IN

IN

IN

IN

–

IN

–

Blind spot monitoring (BSM) control module configuration information

IN

–

IN

IN

–

IN

IN

–

OUT

IN

–

–

IN

IN

Blind spot monitoring (BSM) system activation request

–

–

–

–

–

–

–

–

OUT

–

–

–

IN

–

Blind spot monitoring (BSM) system-related information

–

–

–

–

–

–

–

–

OUT

–

–

–

IN

–

Blind spot monitoring (BSM) system personalization-related information

–

–

–

–

–

–

–

–

IN

–

–

–

OUT

–

–

–

–

–

–

–

–

–

OUT

–

–

–

IN

–

Blower speed

–

–

–

–

–

–

–

–

OUT

–

–

–

IN

–

Cruise control system-related information

IN

–

–

OUT

–

–

–

–

–

–

–

–

–

–

OUT

–

–

IN

–

–

–

–

–

–

–

–

–

–

Cruise control switch

IN

IN

–

–

–

–

–

–

–

OUT

–

–

–

–

IN

–

–

–

–

–

–

–

OUT

–

–

–

IN

–

OUT

–

–

IN

–

–

–

–

IN

IN

–

–

IN

–

Cruise control set speed

OUT

–

–

IN

–

–

–

–

–

–

–

–

–

–

Cranking start

IN

–

–

–

–

–

IN

–

IN

OUT

–

–

–

–

Cranking time

OUT

–

–

–

–

–

–

–

–

IN

–

–

IN

–

Charging system warning light on request

OUT

–

–

–

–

–

–

–

–

IN

–

–

IN

–

Cluster switch status

–

–

IN

–

–

–

–

IN

OUT

–

–

–

–

–

Clutch status

OUT

–

–

–

–

–

–

–

–

–

–

–

IN

–

Clutch pedal stroke sensor

OUT

–

–

IN

–

–

–

–

–

–

–

–

–

–

Collision detection (front, side, roll over)

IN

–

–

IN

–

–

IN

–

–

–

OUT

–

IN

–

Collision detection (rear)

IN

–

–

IN

–

–

IN

–

–

–

OUT

–

IN

–

Charging system warning light on request

OUT

–

–

–

–

–

IN

–

IN

–

–

–

IN

–

DSC system-related information

IN

IN

–

OUT

–

IN

IN

IN

IN

–

–

–

IN

–

OUT

–

–

IN

–

–

–

–

–

–

–

–

–

–

Dimmer cancel

–

–

–

–

–

–

–

–

OUT

IN

–

–

IN

–

Disabling of brake override system signal

OUT

–

–

–

–

–

–

IN

–

IN

–

–

IN

–

Driver-side buckle switch status

IN

–

–

–

–

–

IN

–

IN

IN

OUT

–

IN

–

Driving condition

IN

–

IN

IN

IN

IN

IN

–

OUT

IN

IN

–

IN

IN

Door status

IN

–

–

–

–

–

OUT

–

IN

IN

–

–

IN

IN

EVP control unit-related information

–

–

–

IN

OUT

–

–

–

IN

–

–

–

–

–

Engine switch status

–

–

–

–

–

–

OUT

–

IN

–

–

–

–

–

–

–

IN

–

–

IN

IN

IN

OUT

–

–

–

IN

IN

Engine off time

IN

IN

–

–

–

–

IN

–

OUT

–

–

–

IN

–

Engine Status

OUT

IN

–

IN

IN

IN

IN

–

IN

IN

–

–

IN

–

Engine torque

OUT

–

–

IN

–

–

IN

–

–

–

–

–

–

–

Engine rotation speed

OUT

–

–

IN

IN

IN

IN

IN

IN

IN

–

–

IN

IN

Engine switch status

IN

–

IN

IN

IN

IN

IN

–

OUT

IN

IN

–

IN

IN

Engine coolant temperature

OUT

–

–

–

–

–

IN

–

IN

–

–

–

IN

–

Engine stop request

IN

–

–

–

–

–

–

–

OUT

–

–

–

IN

–

Engine displacement

OUT

IN

–

IN

IN

IN

–

–

IN

–

–

–

IN

IN

EPS status

IN

–

–

–

–

OUT

–

–

IN

–

–

–

IN

–

Fuel tank level

IN

–

–

–

–

–

–

–

OUT

–

–

–

IN

–

Forward sensing camera personalization-related information

–

–

–

–

–

–

–

IN

–

–

–

–

OUT

–

Forward sensing camera customize request

–

–

–

–

–

–

–

OUT

–

–

–

–

IN

–

Fuel cut request

IN

–

–

IN

–

–

IN

–

IN

–

OUT

–

IN

–

Fuel cap warning light on request

OUT

–

–

–

–

–

–

–

IN

–

–

–

IN

–

Fuel-level sensor-related information

–

–

–

–

–

–

OUT

–

IN

–

–

–

–

–

Fuel economy information reset request signal

–

–

–

–

–

–

–

–

IN

–

–

–

OUT

–

Front combination light on request

–

–

–

–

–

–

IN

OUT

–

–

–

–

–

–

Gear position

OUT

–

–

–

–

–

–

–

IN

–

IN

–

IN

IN

–

OUT

–

IN

–

–

IN

IN

IN

IN

IN

–

IN

–

Global central configuration error

OUT

–

–

–

–

–

–

–

IN

–

–

–

IN

–

Global central configuration

IN

IN

IN

IN

–

IN

IN

–

OUT

IN

IN

–

IN

IN

Glow indicator light illumination request

OUT

–

–

–

–

–

–

–

IN

–

–

–

IN

–

Hazard warning switch information

–

–

–

–

–

–

IN

IN

IN

OUT

–

–

–

–

Horn control

–

–

–

–

–

–

IN

–

–

OUT

–

–

–

–

High-beam indicator

–

–

–

–

–

–

OUT

IN

IN

–

–

–

IN

–

Headlight information

IN

–

IN

–

–

–

OUT

IN

IN

–

–

–

IN

–

Headlight warning request signal

–

–

–

–

–

–

OUT

–

IN

–

–

–

IN

–

Hands-free telephone system-related information

IN

IN

IN

IN

–

IN

IN

–

OUT

IN

–

–

IN

IN

Heater control unit configuration information

IN

–

IN

IN

–

IN

IN

–

OUT

IN

–

–

IN

IN

High-beam control personalization-related information

–

–

–

–

–

–

–

IN

–

–

–

–

OUT

–

–

–

–

–

–

–

–

OUT

–

–

–

–

IN

–

Immobilizer-related information

OUT

–

–

–

–

–

–

–

–

IN

–

–

–

–

IN

–

–

–

–

–

–

–

–

OUT

–

–

–

–

Instrument cluster personalization-related information

–

–

–

–

–

–

–

–

IN

–

–

–

OUT

–

–

–

–

–

–

–

–

–

OUT

–

–

–

IN

–

ID data

–

–

–

–

–

–

–

–

–

OUT

–

–

IN

–

Ignition off timer

IN

IN

IN

IN

IN

IN

IN

–

OUT

IN

IN

–

IN

IN

Key status

OUT

–

–

–

–

–

–

–

–

IN

–

–

IN

–

Keyless warning alarm activation request

–

–

–

–

–

–

–

–

IN

OUT

–

–

IN

–

Keyless indicator light on request

–

–

–

–

–

–

–

–

IN

OUT

–

–

IN

–

–

–

–

–

–

–

OUT

–

IN

–

–

–

IN

–

Light switch information

–

–

–

–

–

–

IN

IN

IN

OUT

–

–

–

–

Light switch TNS (Parking Lights) signal

–

–

–

–

–

–

IN

IN

IN

OUT

–

–

–

–

Light switch LO signal

–

–

–

–

–

–

IN

IN

–

OUT

–

–

–

–

Light switch HI signal

–

–

–

–

–

–

IN

IN

–

OUT

–

–

–

–

Light switch OFF signal

–

–

–

–

–

–

IN

IN

–

OUT

–

–

–

–

Lock/Unlock status

–

–

–

–

–

–

–

–

–

OUT

–

–

IN

–

Leveling warning status

–

–

OUT

–

–

–

–

–

IN

–

–

–

IN

–

Manual shift control

–

IN

–

–

–

–

–

–

OUT

–

–

–

–

–

–

OUT

–

IN

–

–

–

–

–

–

–

–

–

–

MT gear position

OUT

–

–

IN

–

–

–

IN

IN

–

IN

–

IN

–

MIL on request

OUT

–

–

–

–

–

–

–

IN

–

–

–

IN

–

Master warning light on request signal

–

–

–

–

–

–

–

–

IN

–

–

–

OUT

–

Neutral switch status

OUT

IN

–

–

–

–

–

–

IN

IN

IN

–

IN

–

Oil warning light on request

OUT

–

–

–

–

–

–

–

IN

–

–

–

IN

–

Oil level warning limit

OUT

–

–

–

–

–

–

–

–

–

–

–

IN

–

Oil level warning

OUT

–

–

–

–

–

–

–

–

–

–

–

IN

–

Power supply status

IN

–

–

–

–

–

IN

–

IN

OUT

–

–

–

–

Passing switch status

–

–

–

–

–

–

IN

IN

IN

OUT

–

–

–

–

Parking brake status

IN

IN

–

IN

–

–

IN

–

OUT

–

–

–

IN

–

Panel light on request

–

–

–

–

–

–

–

–

OUT

–

–

–

IN

–

Panel light level

–

–

–

–

–

–

–

–

OUT

IN

–

–

IN

–

PAD indicator on status

–

–

–

–

–

–

–

–

OUT

–

IN

–

–

–

Power consumption

IN

–

–

–

–

OUT

–

–

–

–

–

–

IN

–

Power supply status

–

–

–

–

–

–

–

–

IN

OUT

–

–

IN

–

Push button system-related information

–

–

–

–

–

–

–

–

IN

OUT

–

–

IN

–

Passenger-side buckle switch status

–

–

–

–

–

–

–

–

IN

–

OUT

–

IN

–

Rolling counter

–

–

–

IN

–

–

–

–

–

–

OUT

–

–

–

Rear window defogger information

IN

–

–

–

–

–

OUT

–

IN

–

–

–

IN

–

Rear window defogger operation request

–

–

–

–

–

–

IN

–

OUT

–

–

–

–

–

ROOM fuse status

IN

–

–

–

–

–

–

IN

OUT

–

–

–

–

–

Steering angle (absolute angle) signal

–

–

–

–

–

IN

–

–

–

OUT

–

–

–

–

Steering angle (estimated absolute angle) signal

IN

IN

IN

IN

–

OUT

–

IN

IN

IN

–

–

IN

–

Steering angle condition

IN

–

–

–

–

OUT

–

–

–

–

–

–

IN

–

Steering shift switch

–

IN

–

–

–

–

–

–

–

OUT

–

–

–

–

Seat warmer cut status

–

–

–

–

–

–

OUT

–

IN

–

–

–

–

–

Security indicator light on request

–

–

–

–

–

–

–

–

IN

OUT

–

–

IN

–

Starter relay status

OUT

–

–

–

–

–

–

–

–

IN

–

–

–

–

Supply voltage

IN

–

IN

IN

IN

IN

IN

–

OUT

IN

IN

–

IN

IN

Steering angle condition

IN

IN

IN

IN

–

IN

IN

–

OUT

IN

–

–

IN

IN

Seat belt status

–

–

–

–

–

–

OUT

–

IN

–

–

–

IN

–

Start stop unit personalization-related information

–

–

–

–

–

–

–

–

–

IN

–

–

OUT

–

–

–

–

–

–

–

–

–

–

OUT

–

–

IN

–

Turn switch status

–

IN

–

–

–

–

IN

IN

IN

OUT

–

–

–

–

Turn indicator light on request

–

–

–

–

–

–

OUT

IN

IN

–

–

–

IN

–

TPMS OFF switch status

–

–

–

IN

–

–

–

–

OUT

–

–

–

IN

–

TNS (Parking Lights) status

–

–

–

–

–

–

OUT

–

IN

IN

–

–

IN

–

Target gear position

–

OUT

–

IN

–

–

–

–

IN

–

–

–

IN

IN

Traveled distance

IN

IN

IN

IN

IN

IN

IN

–

OUT

IN

IN

–

IN

IN

Tire circumference

IN

IN

IN

IN

–

IN

IN

–

OUT

IN

–

–

IN

IN

Temperature control dial status

IN

–

–

–

–

–

–

–

OUT

–

–

–

IN

–

Transmission type

OUT

IN

–

–

–

–

–

–

IN

IN

–

–

–

–

Temperature unit switch signal

–

–

–

–

–

–

–

–

IN

–

–

–

OUT

–

Tuner and amp unit communication status signal

–

–

–

–

–

–

–

–

IN

–

–

–

OUT

–

Traveled distance

OUT

–

–

–

–

–

–

–

IN

–

–

–

IN

–

Vehicle speed

OUT

–

IN

IN

–

IN

IN

IN

IN

IN

IN

–

IN

IN

IN

–

–

OUT

IN

IN

IN

IN

IN

IN

–

–

–

–

Wheel speed

IN

IN

–

OUT

–

IN

IN

IN

IN

IN

–

–

IN

–

Washer level sensor status

–

–

–

–

–

–

OUT

–

IN

–

–

–

IN

–

Wiper (INT) status

–

–

–

–

–

–

IN

–

–

OUT

–

–

–

–

Wiper switch status

–

IN

–

–

–

–

IN

–

–

OUT

–

–

–

–

Wiper status

–

IN

–

–

–

–

IN

–

–

OUT

–

–

–

–

Wiper operation signal

IN

–

–

IN

–

–

OUT

IN

IN

–

–

–

IN

–

Washer switch information

–

–

–

–

–

–

IN

–

IN

OUT

–

–

–

–

Maintenance monitor-related information

–

–

–

–

–

–

–

–

IN

–

–

–

OUT

–

Warning guidance-related information

–

–

–

–

–

–

–

–

IN

–

–

–

OUT

–

Yaw rate

–

–

–

IN

–

–

–

–

–

–

OUT

–

–

–

IN

IN

–

OUT

–

IN

IN

IN

IN

–

–

–

IN

–
MS-CAN communication tableOUT: Output (sends signal)IN: Input (receives signal)

Signal

CAN system related module

Climate control unit

Instrument cluster

Blind spot monitoring (BSM) control module (LH)

Air bag/front seat belt pre-tensioner system warning light on request

IN

OUT

–

Air conditioner signal

IN

OUT

–

Ambient temperature

IN

OUT

IN

Audio configuration information

IN

OUT

IN

Ambient temperature

IN

OUT

–

A/C operation signal

OUT

–

IN

Blower motor relay status

IN

OUT

–

Blind spot monitoring (BSM) switch information

–

OUT

IN

Blind spot monitoring (BSM) control module configuration information

IN

OUT

IN

Blind spot monitoring (BSM) system activation request

–

IN

OUT

Blind spot monitoring (BSM) system-related information

–

IN

OUT

Blind spot monitoring (BSM) system personalization-related information

–

OUT

IN

–

IN

OUT

Blower speed

OUT

–

IN

Back-up light on request

–

OUT

IN

Battery charge status

IN

OUT

IN

Cranking start

IN

OUT

–

Cluster switch status

–

OUT

IN

Dimmer cancel

IN

OUT

IN

Drive information system date

IN

OUT

–

Driving condition

IN

OUT

IN

Engine Status

IN

OUT

–

Engine switch status

IN

OUT

IN

Engine off time

IN

OUT

–

Engine rotation speed

IN

OUT

–

Engine coolant temperature

IN

OUT

–

Engine stop request

OUT

–

IN

Engine displacement

IN

OUT

–

Gear position

–

OUT

IN

Global central configuration

IN

OUT

IN

Hands-free telephone system-related information

IN

OUT

IN

Heater control unit configuration information

IN

OUT

IN

Ignition off timer

IN

OUT

IN

Panel light on request

IN

OUT

IN

Panel light level

IN

OUT

–

Rear window defogger information

IN

OUT

–

Rear window defogger operation request

OUT

–

IN

ROOM fuse status

IN

OUT

–

Supply voltage

IN

OUT

IN

Steering angle condition

IN

OUT

IN

Steering angle (estimated absolute angle) signal

–

OUT

IN

Temperature control dial status

OUT

–

IN

Turn switch status

–

OUT

IN

Tire circumference

IN

OUT

IN

Traveled distance

IN

OUT

IN

Vehicle speed

IN

OUT

IN

Wiper operation signal

IN

OUT

–

Yaw rate

–

OUT

IN
Malfunction diagnosis procedure

  • If a vehicle with a malfunction in a system controlled by a CAN system related module is brought in, verify the repair order form and the malfunctioning symptom first, then perform CAN malfunction diagnosis to determine if the malfunction cause is in the CAN system or not.

  • For CAN malfunction diagnosis, the voltage at the CAN connection terminal on the DLC-2 is measured, and based on the measured value, the CAN circuit can be examined or the malfunction symptom can be determined.

  • If the malfunction symptom is not an open circuit, inspect the voltage or continuity at the CAN circuit and determine the malfunctioning location.

  • If the malfunction symptom is an open circuit, determine the area of the open circuit by using the displayed communication error DTC and the module in which communication has failed.

Ex.) Open circuit location determination procedure
1. Verify the CAN system-related module DTCs and the failed module using the Mazda Modular Diagnostic System (M-MDS).

DTC output module

Mazda Modular Diagnostic System (M-MDS) display

Output DTC

PCM

PCM

U0121:00

EVP control unit

EVP

U0121:00

U0121:02

U0121:87

EPS control module

EPS

U0121:00

BCM

BCM

U0121:00

TCM

TCM

U0121:00

Forward sensing camera (FSC)

FSC

U0121:00

Start stop unit

SSU

U0121:00

U0121:87

Connectivity master unit (CMU)

CMU

U0121:00

Instrument cluster

IC

U0121:00

Module

Fail display

DSC HU/CM

×
2. As a result of DTC verification, only DTCs related to DSC HU/CM and communication errors are output and the DSC HU/CM is indicated as failed, therefore there could be a malfunction in the DSC HU/CM or in the wiring harness between connector C-26, C-27 and DSC HU/CM.

Local CAN

  • Local CAN is used for communication between the following modules:

    • Between PCM and TCM (AT)

    • Between connectivity master unit (CMU), CD player, and tuner and amp unit (with center display)

    • Between audio unit, Bluetooth® unit, and CD player (without center display)

    • Between blind spot monitoring (BSM) control module (LH) and blind spot monitoring (BSM) control module (RH) (with blind spot monitoring (BSM) system)

LIN communication

  • LIN communication is used for communication between the following modules:

    • Between BCM and auto light sensor / rain sensor

    • Between BCM and electrical supply unit (ESU)

    • Between connectivity master unit (CMU) and commander switch

ISO communication

  • ISO communication is used for communication between the following modules:

    • Between rear BCM and start stop unit

Construction

CAN

  • The HS-CAN has terminator resistors built into the following units which form the CAN lines.

    • Between PCM terminals 2AK (CAN_H) and 2AL (CAN_L), resistance value: 124 ohms

    • Between instrument cluster terminals B (CAN_H) and D (CAN_L), resistance value: 120 ohms

  • The MS-CAN has terminal resistors built into the following units which form the CAN lines.

    • Between instrument cluster terminals C (CAN_H) and E (CAN_L), resistance value: 120 ohms

    • Between climate control unit terminals D (CAN_H) and B (CAN_L), resistance value: 120 ohms

Local CAN

  • The local CAN has terminator resistors built into the following units which form the CAN lines.

    • Between connectivity master unit (CMU) terminals 2I (CAN_H) and 2J (CAN_L), resistance value: 120 ohms (with center display)

    • Between tuner and amp unit terminals 2O (CAN_H) and 2Q (CAN_L), resistance value: 120 ohms (with center display)

    • Between audio unit terminals 1O (CAN_H) and 1Q (CAN_L), resistance value: 120 ohms (without center display)

    • Between CD player terminals G (CAN_H) and H (CAN_L), resistance value: 120 ohms (without center display)

    • Between blind spot monitoring (BSM) control module (LH) terminals G (CAN_H) and J (CAN_L), resistance value: 120 ohms (with blind spot monitoring (BSM) system)

    • Between blind spot monitoring (BSM) control module (RH) terminals G (CAN_H) and J (CAN_L), resistance value: 120 ohms (with blind spot monitoring (BSM) system)

    • Between PCM terminals 1A (CAN_H) and 1B (CAN_L), resistance value: 120 ohms

    • Between TCM terminals 1AI (CAN_H) and 1AE (CAN_L), resistance value: 120 ohms

LIN communication

  • The LIN communication has drivers built into the following units which form the LIN communication lines.

    • BCM

    • Auto light sensor / rain sensor

    • Electrical supply unit (ESU)

    • Connectivity master unit (CMU)

    • Commander switch

ISO communication

  • The ISO communication has drivers built into the following units which form the ISO communication lines.

    • Start stop unit

    • BCM

 
 

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

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