VEHICLE CONTROL MODULE (V/C-MODULE) INSPECTION [MAZDA RADAR CRUISE CONTROL (MRCC) SYSTEM]

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1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)

2. Remove the front scuff plate. (RH) (See FRONT SCUFF PLATE REMOVAL/INSTALLATION.)

3. Remove the front side trim. (RH) (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)

4. Connect the negative battery cable.

5. Verify that the voltages of each of the terminals are as indicated in the terminal voltage table (reference).

• If the voltage is not as specified in the terminal voltage table (reference), inspect the parts under Inspection item (s).

― If the system does not work normally even though the Inspection item (s) or related wiring harnesses do not have any malfunction, inspect the vehicle control module (V/C-module) using the on-board diagnostic system.

Terminal Voltage Table (Reference)

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Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item (s)

A

IG1

•  IG1 relay

•  C/U IG1 15 A fuse

Switch the ignition ON (engine off or on)

B+

•  IG1 relay

•  C/U IG1 15 A fuse

Switch the ignition off

1.0 or less

B

—

—

—

—

—

D

—

—

—

—

—

E

—

—

—

—

—

F

—

—

—

—

—

H

—

—

—

—

—

I

—

—

—

—

—

J

—

—

—

—

—

K

—

—

—

—

—

L

—

—

—

—

—

M

—

—

—

—

—

N

—

—

—

—

—

O

—

—

—

—

—

Q

—

—

—

—

—

S

CAN_H

CAN related module

Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.

T

—

—

—

—

—

U

CAN_L

CAN related module

Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.

V

—

—

—

—

—

W

—

—

—

—

—

X

—

—

—

—

—

Z

—

—

—

—

—

AA

—

—

—

—

—

AB

Local CAN_H

Radar sensor

Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.

AD

Local CAN_L

Radar sensor

Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.

AE

GND

Body ground

Under any condition

1.0 or less

Body ground

AF

—

—

—

—

—

Terminal	Signal name	Connected to	Measurement condition	Voltage (V)	Inspection item (s)
A	IG1	• IG1 relay • C/U IG1 15 A fuse	Switch the ignition ON (engine off or on)	B+	• IG1 relay • C/U IG1 15 A fuse
A	IG1	• IG1 relay • C/U IG1 15 A fuse	Switch the ignition off	1.0 or less	• IG1 relay • C/U IG1 15 A fuse
B	—	—	—	—	—
D	—	—	—	—	—
E	—	—	—	—	—
F	—	—	—	—	—
H	—	—	—	—	—
I	—	—	—	—	—
J	—	—	—	—	—
K	—	—	—	—	—
L	—	—	—	—	—
M	—	—	—	—	—
N	—	—	—	—	—
O	—	—	—	—	—
Q	—	—	—	—	—
S	CAN_H	CAN related module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
T	—	—	—	—	—
U	CAN_L	CAN related module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
V	—	—	—	—	—
W	—	—	—	—	—
X	—	—	—	—	—
Z	—	—	—	—	—
AA	—	—	—	—	—
AB	Local CAN_H	Radar sensor	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
AD	Local CAN_L	Radar sensor	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
AE	GND	Body ground	Under any condition	1.0 or less	Body ground
AF	—	—	—	—	—