Infiniti G37 Coupe. Manual - part 273

BRC-66

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1147, C1148, C1149, C1150 USV/HSV LINE

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to diagnosis procedure. Refer to 

BRC-64, "Diagnosis Procedure"

.

Special Repair Requirement

INFOID:0000000001635114

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the neutral position adjustment for the steering angle sensor, when replacing the ABS actua-
tor and electric unit (control unit). Refer to 

BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEU-

TRAL POSITION : Description"

.

>> END

C1155 BRAKE FLUID LEVEL SWITCH

BRC-67

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

C1155 BRAKE FLUID LEVEL SWITCH

Description

INFOID:0000000001635115

The brake fluid level switch converts the brake fluid level to an electric signal and transmits it to the ABS actu-
ator and electric unit (control unit). 

DTC Logic

INFOID:0000000001635116

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

Check the self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-67, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001635117

1.

CHECK CONNECTOR

1.

Turn ignition switch OFF.

2.

Disconnect brake fluid level switch connector and unified meter and A/C amp. connector.

3.

Check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or
replace terminal.

4.

Reconnect connectors and then perform the self-diagnosis.

Is any item indicated on the self-diagnosis display?

YES

>> GO TO 2.

NO

>> Poor connection of connector terminal. Repair or replace connector.

2.

CHECK BRAKE FLUID LEVEL SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect brake fluid level switch connector.

3.

Check continuity between brake fluid level switch connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Brake fluid level switch is malfunction. Replace reservoir tank.

3.

CHECK BRAKE FLUID LEVEL SWITCH CIRCUIT

1.

Disconnect unified meter and A/C amp. connector.

2.

Check continuity between brake fluid level switch harness connector terminals, unified meter and A/C
amp. harness connector terminal and/or ground.

DTC

Display item

Malfunction detected condition

Possible cause

C1155

BR FLUID LEVEL LOW

Brake fluid level is low or communication line between 
the ABS actuator and electric unit (control unit) and brake 
fluid level switch is open or shorted.

• Harness or connector
• Brake fluid level switch
• Unified meter and A/C amp.

Self-diagnosis results

BR FLUID LEVEL LOW

Brake fluid level switch

Condition

Continuity

Connector

Terminal

E47

1 

−

 2

When brake fluid is full in the reservoir tank.

Not existed

When brake fluid is empty in the reservoir tank.

Existed

BRC-68

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1155 BRAKE FLUID LEVEL SWITCH

Is the inspection result normal?

YES

>> Replace unified meter and A/C amp.

NO

>> Repair or replace malfunctioning components.

Component Inspection

INFOID:0000000001635118

1.

CHECK BRAKE FLUID LEVEL SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect brake fluid level switch connector.

3.

Check continuity between brake fluid level switch connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace reservoir tank.

Special Repair Requirement

INFOID:0000000001635119

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the neutral position adjustment for the steering angle sensor, when replacing the ABS actua-
tor and electric unit (control unit). Refer to 

BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEU-

TRAL POSITION : Description"

.

>> END

Unified meter and A/C amp.

Brake fluid level switch

Continuity

Connector

Terminal

Connector

Terminal

M67

57

E47

1

Existed

Unified meter and A/C amp.

—

Continuity

Connector

Terminal

M67

57

Ground

Not existed

Brake fluid level switch

—

Continuity

Connector

Terminal

E47

2

Ground

Existed

Brake fluid level switch

Condition

Continuity

Connector

Terminal

E47

1 

−

 2

When brake fluid is full in the reservoir tank.

Not existed

When brake fluid is empty in the reservoir tank.

Existed

C1185 ICC UNIT

BRC-69

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

C1185 ICC UNIT

Description

INFOID:0000000001751278

The ABS actuator and electric unit (control unit) and the ICC sensor integrated unit exchange signals via the
CAN communication line.

DTC Logic

INFOID:0000000001751279

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

Check the self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-69, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001751280

1.

CHECK ICC SENSOR INTEGRATED UNIT CIRCUIT

Perform ICC sensor integrated unit self-diagnosis.
Is any item indicated on the self-diagnosis display?

YES

>> Repair or replace malfunction components.

NO

>> GO TO 2.

2.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Perform ABS actuator and electric unit (control unit) self-diagnosis.

Is any item indicated on the self-diagnosis display?

YES

>> Repair or replace malfunction components.

NO

>> INSPECTION END

Special Repair Requirement

INFOID:0000000001751282

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the neutral position adjustment for the steering angle sensor, when replacing the ABS actua-
tor and electric unit (control unit). Refer to 

BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEU-

TRAL POSITION : Description"

.

>> END

DTC

Display item

Malfunction detected condition

Possible cause

C1185

ACC CONT

ICC sensor integrated unit internal malfunction.

• Harness or connector
• ICC sensor integrated unit
• ABS actuator and electric unit 

(control unit)

• CAN communication line

Self-diagnosis results

ACC CONT