Infiniti QX56 (Z62). Manual - part 327

DAS

C1A00 CONTROL UNIT

DAS-345

< DTC/CIRCUIT DIAGNOSIS >

[LDW & LDP]

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DTC/CIRCUIT DIAGNOSIS

C1A00 CONTROL UNIT

DTC Logic

INFOID:0000000006223739

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Perform “All DTC Reading” with CONSULT-III. 

3.

Check if the “C1A00” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “C1A00” detected as the current malfunction?

YES

>> Refer to 

DAS-345, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006223740

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if any DTC other than “C1A00” is detected in “Self Diagnostic Result” of “ICC/ADAS”. 
Is any DTC detected?

YES

>> Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to

DAS-38, "DTC Index"

.

NO

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

DTC

(On board dis-

play)

Trouble diagnosis name

DTC detecting condition

Possible causes

C1A00

(0)

CONTROL UNIT

ADAS control unit internal malfunction

ADAS control unit

DAS-346

< DTC/CIRCUIT DIAGNOSIS >

[LDW & LDP]

C1A01 POWER SUPPLY CIRCUIT 1, C1A02 POWER SUPPLY CIRCUIT 2

C1A01 POWER SUPPLY CIRCUIT 1, C1A02 POWER SUPPLY CIRCUIT 2

DTC Logic

INFOID:0000000006223741

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Turn the LDP system ON.

3.

Perform “All DTC Reading” with CONSULT-III. 

4.

Check if the “C1A01” or “C1A02” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/
ADAS”. 

Is “C1A01” or “C1A02” detected as the current malfunction?

YES

>> Refer to 

DAS-346, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-40, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000006223742

1.

CHECK ADAS CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Check power supply and ground circuit of ADAS control unit. Refer to 

DAS-387, "ADAS CONTROL UNIT :

Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

NO

>> Repair or replace the malfunctioning parts. 

DTC

(On board dis-

play)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A01

(1)

POWER SUPPLY 
CIR

The battery voltage sent to ADAS control unit re-
mains less than 7.9 V for 5 seconds

• Connector, harness, fuse
• ADAS control unit

C1A02

(2)

POWER SUPPLY 
CIR 2

The battery voltage sent to ADAS control unit re-
mains more than 19.3 V for 5 seconds

DAS

C1A03 VEHICLE SPEED SENSOR

DAS-347

< DTC/CIRCUIT DIAGNOSIS >

[LDW & LDP]

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C1A03 VEHICLE SPEED SENSOR

DTC Logic

INFOID:0000000006223743

DTC DETECTION LOGIC

NOTE:
If DTC “C1A03” is detected along with DTC “U1000” or “C1A04”, first diagnose the DTC “U1000” or “C1A04”. 
• Refer to 

DAS-374, "ADAS CONTROL UNIT : DTC Logic"

 for DTC “U1000”.

• Refer to 

DAS-348, "DTC Logic"

 for DTC “C1A04”.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Turn the LDP system ON. 

3.

Drive the vehicle at 30 km/h (19 MPH) or more. 

CAUTION:

Always drive safely. 

4.

Stop the vehicle.

5.

Perform “All DTC Reading” with CONSULT-III. 

6.

Check if the “C1A03” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “C1A03” detected as the current malfunction?

YES-1 (Lane departure warning lamp: ON)>>Refer to 

DAS-347, "Diagnosis Procedure"

.

YES-2 (Lane departure warning lamp: OFF)>>Refer to 

CCS-87, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-40, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000006223744

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “C1A04” or “U1000” is detected other than “C1A03” in “Self Diagnostic Result” of “ICC/ADAS”. 
Is any DTC detected?

YES

>> Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to

DAS-310, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS RESULTS

Check if any DTC is detected in “Self Diagnostic Result” of “ABS”. 
Is any DTC detected?

YES

>> Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to

BRC-51, "DTC Index"

. 

NO

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

DTC

(On board 

display)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A03

(3)

VHCL SPEED SE 
CIRC

If the vehicle speed signal (wheel speed) from 
ABS actuator and electric unit (control unit) re-
ceived by the ADAS control unit via CAN com-
munication, are inconsistent

• Wheel speed sensor
• ABS actuator and electric unit (control 

unit)

• ADAS control unit

DAS-348

< DTC/CIRCUIT DIAGNOSIS >

[LDW & LDP]

C1A04 ABS/TCS/VDC SYSTEM

C1A04 ABS/TCS/VDC SYSTEM

DTC Logic

INFOID:0000000006228186

DTC DETECTION LOGIC

NOTE:
If DTC “C1A04” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to 

DAS-374,

"ADAS CONTROL UNIT : DTC Logic"

. 

Diagnosis Procedure

INFOID:0000000006228187

1.

CHECK SELF-DIAGNOSIS RESULTS

1.

Perform “All DTC Reading” with CONSULT-III. 

2.

Check if the “U1000” is detected other than “C1A04” in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “U1000” detected?

YES

>> Perform the CAN communication system inspection. Repair or replace the malfunctioning parts.

Refer to 

DAS-374, "ADAS CONTROL UNIT : DTC Logic"

. 

NO

>> GO TO 2.

2.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS RESULTS

Check if any DTC is detected in “Self Diagnostic Result” of “ABS”. 

Is any DTC detected?

YES

>> Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to

BRC-51, "DTC Index"

.

NO

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

DTC

(On board dis-

play)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A04

(4)

ABS/TCS/VDC CIRC

If a malfunction occurs in the VDC/TCS/ABS 
system

ABS actuator and electric unit (control 
unit)