Infiniti QX56 (Z62). Manual - part 255

DAS

C1A00 CONTROL UNIT

DAS-57

< DTC/CIRCUIT DIAGNOSIS >

[ADAS CONTROL UNIT]

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DTC/CIRCUIT DIAGNOSIS

C1A00 CONTROL UNIT

DTC Logic

INFOID:0000000006223481

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-57, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006223482

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-58

< DTC/CIRCUIT DIAGNOSIS >

[ADAS CONTROL UNIT]

C1A01 POWER SUPPLY CIRCUIT 1, C1A02 POWER SUPPLY CIRCUIT 2

C1A01 POWER SUPPLY CIRCUIT 1, C1A02 POWER SUPPLY CIRCUIT 2

DTC Logic

INFOID:0000000006223483

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Turn the MAIN switch of ICC 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-58, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-40, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000006223484

1.

CHECK ADAS CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

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

DAS-62, "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

U1000 CAN COMM CIRCUIT

DAS-59

< DTC/CIRCUIT DIAGNOSIS >

[ADAS CONTROL UNIT]

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U1000 CAN COMM CIRCUIT

Description

INFOID:0000000006223485

CAN COMMUNICATION

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control units, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 communication lines (CAN-H, CAN-L) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads the required data only.
CAN communication signal chart. Refer to 

LAN-28, "CAN COMMUNICATION SYSTEM : CAN Communica-

tion Signal Chart"

.

ITS COMMUNICATION

• ITS communication is a multiplex communication system. This enables the system to transmit and receive

large quantities of data at high speed by connecting control units with 2 communication lines.

• ITS communication lines adopt twisted-pair line style (two lines twisted) for noise immunity.

DTC Logic

INFOID:0000000006223486

DTC DETECTION LOGIC

NOTE:
If “U1000” is detected, first diagnose the CAN communication system. 

Diagnosis Procedure

INFOID:0000000006223487

1.

PERFORM THE SELF-DIAGNOSIS

1.

Turn the ignition switch ON.

2.

Turn the MAIN switch of ICC system ON, and then wait for 30 seconds or more. 

3.

Perform “All DTC Reading” with CONSULT-III. 

4.

Check if the “U1000” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “U1000” detected as the current malfunction?

YES

>> Refer to 

LAN-18, "Trouble Diagnosis Flow Chart"

. 

NO

>> Refer to 

GI-40, "Intermittent Incident"

. 

DTC

(On board 

display)

Trouble diagnosis name

DTC detecting condition

Possible causes

U1000

(100)

CAN COMM CIRCUIT

If ADAS control unit is not transmitting or receiv-
ing CAN communication signal or ITS communi-
cation signal for 2 seconds or more

• CAN communication system
• ITS communication system

DAS-60

< DTC/CIRCUIT DIAGNOSIS >

[ADAS CONTROL UNIT]

U1010 CONTROL UNIT (CAN)

U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000006223488

CAN controller controls the communication of CAN communication signal and ITS communication signal, and
the error detection.

DTC Logic

INFOID:0000000006223489

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000006223490

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn the MAIN switch of ICC system ON. 

2.

Perform “All DTC Reading” with CONSULT-III. 

3.

Check if the “U1010” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “U1010” detected as the current malfunction?

YES

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

.

NO

>> INSPECTION END

DTC

(On board 

display)

Trouble diagnosis name

DTC detecting condition

Possible causes

U1010

(110)

CONTROL UNIT (CAN)

If ADAS control unit detects malfunction by 
CAN controller initial diagnosis

ADAS control unit