Infiniti FX35, FX50 (S51). Manual - part 354

CCS-236

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

C1A11 PRESSURE CONTROL

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace the brake booster. 

5.

CHECK HARNESS BETWEEN BRAKE BOOSTER (BOOSTER SOLENOID) AND BRAKE BOOSTER

CONTROL UNIT

1.

Turn the ignition switch OFF.

2.

Disconnect connectors of brake booster control unit and brake booster. 

3.

Check for continuity between the brake booster control unit harness connector and brake booster harness
connector. 

4.

Check for continuity between brake booster control unit harness connector and ground. 

Is the inspection result normal?

YES

>> Replace the brake booster control unit. 

NO

>> Repair the harnesses or connectors.

Component Inspection

INFOID:0000000005501824

1.

CHECK BRAKE BOOSTER (BOOSTER SOLENOID)

Check resistance between brake booster (booster solenoid) termi-
nals. 

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the brake booster. 

Special Repair Requirement

INFOID:0000000005501825

DESCRIPTION

Perform the action test after adjusting the laser beam aiming of ICC sensor integrated unit when the following
operation is performed. 
• Removal and installation of ICC sensor integrated unit
• Replacement of ICC sensor integrated unit

SPECIAL REPAIR REQUIREMENT

1.

LASER BEAM AIMING ADJUSTMENT OF ICC SENSOR INTEGRATED UNIT

Adjust the laser beam aiming of the ICC sensor integrated unit. Refer to 

CCS-13, "LASER BEAM AIMING

ADJUSTMENT : Description"

. 

>> GO TO 2.

Brake booster control unit

Brake booster

Continuity

Connector

Terminal

Connector

Terminal

B250

10

E44

4

Existed

12

6

Brake booster control unit

Ground

Continuity

Connector

Terminal

B250

10

Not existed

12

Brake booster

Resistance

Terminal

4

6

Approx. 1.4 

Ω

JPOIA0160GB

CCS

C1A11 PRESSURE CONTROL

CCS-237

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

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A

2.

CHECK DCA SYSTEM

1.

Erase the “self-diagnosis results”, and then perform “All DTC Reading” again after performing the action
test. (Refer to 

CCS-191, "ACTION TEST : Description"

 for action test.)

2.

Check that the DCA system is normal. 

>> WORK END

CCS-238

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

C1A12 LASER BEAM OFF CENTER

C1A12 LASER BEAM OFF CENTER

Description

INFOID:0000000005501826

ICC sensor integrated unit detects the reflected light from the vehicle ahead by irradiating a laser forward. It
calculates the distance from and relative speed with the vehicle ahead based on the detected signal. 

DTC Logic

INFOID:0000000005501827

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000005501828

1.

ADJUST LASER BEAM AIMING

1.

Adjust the laser beam aiming with CONSULT-III. Refer to 

CCS-13, "LASER BEAM AIMING ADJUST-

MENT : Description"

. 

2.

Perform “All DTC Reading”. 

3.

Check if the “C1A12” is detected in “Self Diagnostic Result” of “ICC”. 

Is “C1A12” detected?

YES

>> Replace ICC sensor integrated unit. Refer to 

CCS-380, "Exploded View"

. 

NO

>> INSPECTION END

Special Repair Requirement

INFOID:0000000005501829

DESCRIPTION

Perform the action test after adjusting the laser beam aiming of ICC sensor integrated unit when the following
operation is performed. 
• Removal and installation of ICC sensor integrated unit
• Replacement of ICC sensor integrated unit

SPECIAL REPAIR REQUIREMENT

1.

LASER BEAM AIMING ADJUSTMENT OF ICC SENSOR INTEGRATED UNIT

Adjust the laser beam aiming of the ICC sensor integrated unit. Refer to 

CCS-13, "LASER BEAM AIMING

ADJUSTMENT : Description"

. 

>> GO TO 2.

2.

CHECK DCA SYSTEM

1.

Erase the “self-diagnosis results”, and then perform “All DTC Reading” again after performing the action
test. (Refer to 

CCS-191, "ACTION TEST : Description"

 for action test.)

2.

Check that the DCA system is normal. 

>> WORK END

DTC

(On board dis-

play)

Trouble diagnosis name

DTC detecting condition

Possible causes

C1A12

(12)

LASER BEAM OFFCNTR

Laser beam of ICC sensor integrated unit is 
off the aiming point

Laser beam is off the aiming point

CCS

C1A13 STOP LAMP RELAY

CCS-239

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

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C1A13 STOP LAMP RELAY

Description

INFOID:0000000005501830

• The ICC sensor integrated unit transmits the ICC brake hold relay drive signal to the brake booster control

unit via ITS communication. 

• The ICC brake hold relay activates the stop lamp by the ICC brake hold relay drive signal (stop lamp drive

signal) outputted by the brake booster control unit.

DTC Logic

INFOID:0000000005501831

DTC DETECTION LOGIC

NOTE:
If DTC “C1A13” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to 

CCS-313, "ICC

SENSOR INTEGRATED UNIT : DTC Logic"

. 

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE (1)

1.

Start the engine.

2.

Perform the active test item “STOP LAMP” with CONSULT-III. 

3.

Perform “All DTC Reading”. 

4.

Check if the “C1A13” is detected as the current malfunction in the self-diagnosis results of “ICC”. 

Is “C1A13” detected as the current malfunction?

YES

>> Refer to 

CCS-239, "Diagnosis Procedure"

.

NO

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE (2)

1.

Drive at the vehicle speed of 40 km/h (25 MPH) or more for approximately 20 seconds or more without the
brake pedal depressed. 

CAUTION:

Always drive safely. 
NOTE:
If it is outside the above conditions, repeat the step 1. 

2.

Perform “All DTC Reading”. 

3.

Check if the “C1A13” is detected as the current malfunction in the self-diagnosis results of “ICC”. 

Is “C1A13” detected as the current malfunction?

YES

>> Refer to 

CCS-239, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000005501832

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “U1000” is detected other than “C1A13” in “Self Diagnostic Result” of “ICC”. 
Is “U1000” detected?

DTC

(On board dis-

play)

Trouble diagnosis name

DTC detecting condition

Possible causes

C1A13

(13)

STOP LAMP RLY FIX

• If the stop lamp is not activated even 

though the ICC sensor integrated unit is 
transmitting a ICC brake hold relay drive 
signal.

• If the stop lamp is activated even though 

the ICC sensor integrated unit is not trans-
mitting a ICC brake hold relay drive signal. 

• Stop lamp switch circuit
• ICC brake switch circuit
• ICC brake hold relay circuit
• Stop lamp switch
• ICC brake switch
• ICC brake hold relay
• Incorrect stop lamp switch installation
• Incorrect ICC brake switch installation
• ECM