Infiniti G37 Coupe. Manual - part 305

CCS

C1A04 ABS/TCS/VDC SYSTEM

CCS-33

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>> GO TO 6.

6.

CHECK ICC SYSTEM

1.

Erase DTC and perform ICC system action test. Then perform self-diagnosis of ICC sensor integrated
unit. (For the details on the ICC system action test, refer to 

CCS-11, "ACTION TEST : Special Repair

Requirement (Vehicle-To-Vehicle Distance Control Mode)"

).

2.

Check that no abnormal condition is present in the ICC system. 

>> INSPECTION END

CCS-34

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C1A05 BRAKE SW/STOP LAMP SW

C1A05 BRAKE SW/STOP LAMP SW

Description

INFOID:0000000001606883

• When the brake pedal is depressed, ICC brake switch is turned OFF and stop lamp switch is turned ON.
• ICC brake switch signal is inputted to ECM. ECM transmits the data to the ICC sensor integrated unit with

CAN communication. 

• Stop lamp switch signal is inputted to ECM and the ABS actuator and electric unit (control unit). ECM and

the ABS actuator and electric unit (control unit) transmit the data to the ICC sensor integrated unit with CAN
communication. 

NOTE:
If DTC C1A05 is detected along with DTC U1000, U0401, U0415 or U0121, first diagnose the DTC U1000,
U0401, U0415 or U0121.
• DTC U1000: Refer to 

CCS-79, "Diagnosis Procedure"

.

• DTC U0401: Refer to 

CCS-73, "Diagnosis Procedure"

.

• DTC U0415: Refer to 

CCS-77, "Diagnosis Procedure"

.

• DTC U0121: Refer to 

CCS-71, "Diagnosis Procedure"

.

DTC Logic

INFOID:0000000001606884

DTC DETECTION LOGIC

Diagnosis Procedure (A/T Models)

INFOID:0000000001606885

1.

PERFORM SELF-DIAGNOSIS OF ICC SENSOR INTEGRATED UNIT

1.

Perform self-diagnosis of ICC sensor integrated unit.

2.

Check if DTC “CAN COMM CIRCUIT [U1000]” (DTC 100), “ECM CAN CIR 1 [U0401]” (DTC 120), “VDC
CAN CIR 1 [U0415]” (DTC 126) or “VDC CON CIR 2 [U0121]” (DTC 127) other than “BRAKE SW/STOP L
SW [C1A05]” (DTC 5) is detected.

Is any DTC detected?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

DIAGNOSIS FOR DETECTED DTC

Perform diagnosis on the detected DTC and repair or replace the applicable item. Refer to 

CCS-92, "DTC

Index"

.

>> GO TO 27.

3.

CHECK ICC BRAKE SWITCH WITH ICC DATA MONITOR

With CONSULT-III

With “DATA MONITOR” of “ICC”, check if “BRAKE SW” operates normally. 

DTC No.

(On board 

display)

Trouble diagnosis name

DTC detecting condition

Possible cause

C1A05

(5)

BRAKE SW/STOP L SW

If the ICC sensor integrated unit receives sig-
nals indicating that the stop lamp switch [from 
ABS actuator and electric unit (control unit)] is 
ON and the ICC brake switch (from ECM) is ON.

• Stop lamp switch circuit
• ICC brake switch circuit
• ICC clutch switch circuit (M/T)
• Stop lamp switch
• ICC brake switch
• ICC clutch switch (M/T)
• Incorrect stop lamp switch installation
• Incorrect ICC brake switch installation
• Incorrect ICC clutch switch installation 

(M/T)

• ECM
• ABS actuator and electric unit (control 

unit)

CCS

C1A05 BRAKE SW/STOP LAMP SW

CCS-35

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Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 7.

4.

CHECK STOP LAMP SWITCH WITH ABS DATA MONITOR

With CONSULT-III

With “Data Monitor” of “ABS”, check if “STOP LAMP SW” operates normally. 
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 16.

5.

PERFORM SELF-DIAGNOSIS OF ECM

1.

Perform self-diagnosis of ECM.

2.

Check if DTC is detected. Refer to 

EC-552, "DTC Index"

.

Is any DTC detected?

YES

>> GO TO 25.

NO

>> GO TO 6.

6.

PERFORM SELF-DIAGNOSIS OF ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

1.

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

2.

Check if DTC is detected. Refer to 

BRC-88, "DTC No. Index"

.

Is any DTC detected?

YES

>> GO TO 25.

NO

>> GO TO 26.

7.

CHECK ICC BRAKE SWITCH INSTALLATION

1.

Turn ignition switch OFF.

2.

Check ICC brake switch for proper installation. Refer to 

BR-7, "Inspection and Adjustment"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

ADJUST ICC BRAKE SWITCH

Adjust ICC brake switch. Refer to 

BR-7, "Inspection and Adjustment"

.

>> GO TO 27.

9.

CHECK ICC BRAKE SWITCH

1.

Disconnect ICC brake switch connector.

2.

Check ICC brake switch. Refer to 

CCS-42, "Component Inspection (ICC BRAKE SWITCH)"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 10.

10.

REPLACE ICC BRAKE SWITCH

Replace ICC brake switch.

>> GO TO 27.

11.

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch ON.

2.

Check voltage between ICC brake switch harness connector and ground.

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C1A05 BRAKE SW/STOP LAMP SW

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> GO TO 12.

12.

REPAIR OR REPLACE ICC BRAKE SWITCH HARNESS OR FUSE

Repair or replace ICC brake switch power supply harness or fuse.

>> GO TO 27.

13.

CHECK HARNESS BETWEEN ICC BRAKE SWITCH AND ECM

1.

Turn ignition switch OFF.

2.

Disconnect ECM connector.

3.

Check continuity between ICC brake switch harness connector and ECM harness connector.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> GO TO 14.

14.

REPAIR OR REPLACE HARNESS BETWEEN ICC BRAKE SWITCH AND ECM

Repair or replace harness between ICC brake switch and ECM.

>> GO TO 27.

15.

PERFORM SELF-DIAGNOSIS OF ECM

1.

Perform self-diagnosis of ECM.

2.

Check if DTC is detected. Refer to 

EC-552, "DTC Index"

.

Is any DTC detected?

YES

>> GO TO 25.

NO

>> GO TO 26.

16.

CHECK STOP LAMP SWITCH INSTALLATION

1.

Turn ignition switch OFF.

2.

Check stop lamp switch for proper installation. Refer to 

BR-7, "Inspection and Adjustment"

.

Is the inspection result normal?

YES

>> GO TO 18.

NO

>> GO TO 17.

17.

ADJUST STOP LAMP SWITCH

Adjust stop lamp switch. Refer to 

BR-7, "Inspection and Adjustment"

.

>> GO TO 27.

18.

CHECK STOP LAMP SWITCH

1.

Disconnect stop lamp switch connector.

2.

Check stop lamp switch. Refer to 

CCS-43, "Component Inspection (STOP LAMP SWITCH)"

.

Is the inspection result normal?

Terminal

Voltage

(Approx.)

(+)

(–)

ICC brake switch 
connector

Terminal

E114

1 Ground

Battery 

voltage

ICC brake switch

ECM

Continuity

Connector

Terminal Connector

Terminal

E114

2

M107

126

Existed