Infiniti EX35. Manual - part 375

CCS

C1A05 BRAKE SW/STOP LAMP SW

CCS-35

< COMPONENT DIAGNOSIS >

[INTELLIGENT CRUISE CONTROL]

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C1A05 BRAKE SW/STOP LAMP SW

Description

INFOID:0000000003130046

• 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. 

DTC Logic

INFOID:0000000003130047

DTC DETECTION LOGIC

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-75, "Diagnosis Procedure"

.

• DTC “U0401”: Refer to 

CCS-69, "Diagnosis Procedure"

.

• DTC “U0415”: Refer to 

CCS-73, "Diagnosis Procedure"

.

• DTC “U0121”: Refer to 

CCS-67, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003130048

1.

PERFORM SELF-DIAGNOSIS OF ICC SENSOR INTEGRATED UNIT

1.

Perform self-diagnosis of ICC sensor integrated unit.

2.

Check if DTC “U1000: CAN COMM CIRCUIT” (DTC 100), “U0401: ECM CAN CIR 1” (DTC 120), “U0415:
VDC CAN CIR 1” (DTC 126) or “U0121: VDC CAN CIR 2” (DTC 127) other than “C1A05: BRAKE SW/
STOP L SW” (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-85, "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. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 7.

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
• Stop lamp switch
• ICC brake switch
• Incorrect stop lamp switch installation
• Incorrect ICC brake switch installation
• ECM
• ABS actuator and electric unit (control 

unit)

CCS-36

< COMPONENT DIAGNOSIS >

[INTELLIGENT CRUISE CONTROL]

C1A05 BRAKE SW/STOP LAMP SW

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-514, "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-95, "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-39, "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.

Is the inspection result normal?

Terminal

Voltage

(Approx.)

(+)

(–)

ICC brake switch 
connector

Terminal

E114

1 Ground

Battery 

voltage

CCS

C1A05 BRAKE SW/STOP LAMP SW

CCS-37

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[INTELLIGENT CRUISE CONTROL]

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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-514, "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-39, "Component Inspection (STOP LAMP SWITCH)"

.

Is the inspection result normal?

YES

>> GO TO 20.

NO

>> GO TO 19.

19.

REPLACE STOP LAMP SWITCH

Replace stop lamp switch.

>> GO TO 27.

ICC brake switch

ECM

Continuity

Connector

Terminal Connector

Terminal

E114

2

M107

126

Existed

CCS-38

< COMPONENT DIAGNOSIS >

[INTELLIGENT CRUISE CONTROL]

C1A05 BRAKE SW/STOP LAMP SW

20.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch ON.

2.

Check voltage between stop lamp switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 22.

NO

>> GO TO 21.

21.

REPAIR OR REPLACE STOP LAMP SWITCH HARNESS OR FUSE

Repair or replace stop lamp switch power supply harness or fuse.

>> GO TO 27.

22.

CHECK HARNESS BETWEEN STOP LAMP SWITCH AND ABS ACTUATOR AND ELECTRIC UNIT

(CONTROL UNIT)

1.

Turn ignition switch OFF.

2.

Disconnect ABS actuator and electric unit (control unit) connector.

3.

Check continuity between stop lamp switch harness connector and ABS actuator and electric unit (control
unit) harness connector.

Is the inspection result normal?

YES

>> GO TO 24.

NO

>> GO TO 23.

23.

REPAIR OR REPLACE HARNESS BETWEEN STOP LAMP SWITCH AND ABS ACTUATOR AND ELEC-

TRIC UNIT (CONTROL UNIT)

Repair or replace harness between stop lamp switch and ABS actuator and electric unit (control unit).

>> GO TO 27.

24.

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-95, "DTC No. Index"

.

>> GO TO 25.

25.

REPAIR OR REPLACE APPLICABLE ITEM

Repair or replace the applicable item identified by the self-diagnosis result.

>> GO TO 27.

26.

REPLACE ICC SENSOR INTEGRATED UNIT

1.

Replace ICC sensor integrated unit.

2.

Adjust laser beam aiming. Refer to 

CCS-8, "LASER BEAM AIMING ADJUSTMENT : Special Repair

Requirement (Preparation)"

.

Terminal

Voltage

(Approx.)

(+)

(–)

Stop lamp switch 
connector

Terminal

E110

1

Ground

Battery voltage

Stop lamp switch

ABS actuator and electric unit 

(control unit)

Continuity

Connector

Terminal Connector

Terminal

E110

2

E41

30

Existed