Infiniti G37 Coupe. Manual - part 230

BCS-38

< COMPONENT DIAGNOSIS >

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000001612414

1.

CHECK FUSE AND FUSIBLE LINK

Check that the following fuse and fusible link are not blown.

Is the fuse fusing?

YES

>> Replace the blown fuse or fusible link after repairing the affected circuit if a fuse or fusible link is

blown.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect BCM connectors.

3.

Check voltage between BCM harness connector and ground.

Is the measurement value normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

Does continuity exist?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

Signal name

Fuse and fusible link No.

Battery power supply

K

10

Terminals

Voltage

(Approx.)

(+)

(

−

)

BCM

Ground

Connector

Terminal

M118

1

Battery voltage

M119

11

BCM

Ground

Continuity

Connector

Terminal

M119

13

Existed

BCS

COMBINATION SWITCH INPUT CIRCUIT

BCS-39

< COMPONENT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

COMBINATION SWITCH INPUT CIRCUIT

Diagnosis Procedure

INFOID:0000000001612415

1.

CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN

1.

Turn the ignition switch OFF.

2.

Disconnect the BCM and combination switch connectors.

3.

Check continuity between BCM harness connector and combination switch harness connector.

Does continuity exist?

YES

>> GO TO 2.

NO

>> Repair the harnesses or connectors.

2.

CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR SHORT

Check for continuity between BCM harness connector and ground.

Does continuity exist?

YES

>> Repair the harnesses or connectors.

NO

>> GO TO 3.

3.

CHECK BCM OUTPUT VOLTAGE

1.

Connect the BCM connector.

2.

Check voltage between BCM harness connector and ground.

Is the measurement value normal?

YES

>> GO TO 4.

NO

>> Replace BCM.

System

BCM

Combination switch

Continuity

Connector

Terminal

Connector

Terminal

INPUT 1

M122

107

M33

11

Existed

INPUT 2

109

9

INPUT 3

88

7

INPUT 4

108

10

INPUT 5

87

13

System

BCM

Ground

Continuity

Connector

Terminal

INPUT 1

M122

107

Not existed

INPUT 2

109

INPUT 3

88

INPUT 4

108

INPUT 5

87

System

Terminals

Voltage

(Approx.)

(+)

(

−

)

BCM

Ground

Connector

Terminal

INPUT 1

M122

107

Refer to 

BCS-

43, "Refer-

ence Value"

.

INPUT 2

109

INPUT 3

88

INPUT 4

108

INPUT 5

87

BCS-40

< COMPONENT DIAGNOSIS >

COMBINATION SWITCH INPUT CIRCUIT

4.

CHECK BCM INPUT SIGNAL

1.

Connect the combination switch connector.

2.

Turn ON any switch in the system that is malfunctioning.

3.

Check voltage between BCM harness connector and ground.

Is the measurement value normal when any of the switches is turned ON?

YES

>> Replace BCM.

NO

>> Replace the combination switch.

Special Repair Requirement

INFOID:0000000001612416

1.

REQUIRED WORK WHEN REPLACING BCM

Initialize control unit. Refer to CONSULT-III operation manual NATS-IVIS/NVIS.

>> Work end.

System

Terminals

Voltage

(Approx.)

(+)

(

−

)

BCM

Ground

Connector

Terminal

INPUT 1

M122

107

Refer to 

BCS-

43, "Refer-

ence Value"

.

INPUT 2

109

INPUT 3

88

INPUT 4

108

INPUT 5

87

BCS

COMBINATION SWITCH OUTPUT CIRCUIT

BCS-41

< COMPONENT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

COMBINATION SWITCH OUTPUT CIRCUIT

Diagnosis Procedure

INFOID:0000000001612417

1.

CHECK OUTPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN

1.

Turn the ignition switch OFF.

2.

Disconnect the BCM and combination switch connectors.

3.

Check continuity between BCM harness connector and combination switch harness connector.

Does continuity exist?

YES

>> GO TO 2.

NO

>> Repair the harnesses or connectors.

2.

CHECK OUTPUT 1 - 5 SYSTEM CIRCUIT FOR SHORT

Check for continuity between BCM harness connector and ground.

Does continuity exist?

YES

>> Repair the harnesses or connectors.

NO

>> GO TO 3.

3.

CHECK COMBINATION SWITCH OUTPUT VOLTAGE

1.

Connect the combination switch connector.

2.

Turn ON any switch in the system that is malfunctioning.

3.

Check voltage between combination switch harness connector and ground.

System

BCM

Combination switch

Continuity

Connector

Terminal

Connector

Terminal

OUTPUT 1

M123

143

M33

12

Existed

OUTPUT 2

144

14

OUTPUT 3

145

5

OUTPUT 4

146

2

OUTPUT 5

142

8

System

BCM

Ground

Continuity

Connector

Terminal

OUTPUT 1

M123

143

Not existed

OUTPUT 2

144

OUTPUT 3

145

OUTPUT 4

146

OUTPUT 5

142

System

Terminals

Value (Approx.)

(+)

(

−

)

Combination switch

Ground

Connector

Terminal

OUTPUT 1

M33

12

1.4 V

OUTPUT 2

14

OUTPUT 3

5

OUTPUT 4

2

OUTPUT 5

8

JPMIA0041GB