Infiniti FX35, FX50 (S51). Manual - part 1784

C1929 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

STC-77

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

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C1929 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Description

INFOID:0000000005549723

The ABS actuator and electric unit (control unit) and the RAS control unit exchange signals via the CAN com-
munication line.

DTC Logic

INFOID:0000000005549724

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

NOTE:
Every time when “C1929” is detected, either the ABS actuator ad electric unit (control unit) or the RAS control
unit simultaneously detects a DTC that leads to a direct cause of the malfunction.

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch from OFF to ON.

2.

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.

Without CONSULT-III

1.

Start the engine.

2.

Perform the self-diagnosis. Refer to 

STC-38, "Diagnosis Description"

.

Is DTC “C1929” or “RAS warning lamp flickering pattern:26” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-77, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005549725

1.

PERFORM SELF-DIAGNOSIS

With CONSULT-III

1.

Turn the ignition switch from OFF to ON.

2.

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.

Is DTC “U1000” or “U1010” detected?

YES

>> Check the malfunction system.

NO

>> GO TO 2.

2.

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

With CONSULT-III

Perform “ABS” self-diagnosis. 

Is DTC except “DTC related to a malfunction of RAS control unit” detected?

YES

>> Check the DTC. Refer to 

BRC-119, "DTC Index"

.

NO

>> GO TO 3.

3.

PERFORM RAS CONTROL UNIT SELF-DIAGNOSIS

With CONSULT-III

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.
Is DTC except “C1929” detected?

YES

>> Check the DTC. Refer to 

STC-102, "DTC Index"

.

NO

>> GO TO 4.

4.

INFORMATION CHECK

DTC

Display items

Malfunction detected condition

Possible cause

C1929

VDC

Malfunction is detected in VDC malfunction signal that 
is output from ABS actuator and electric unit (control 
unit) via CAN communication.
(VDC malfunction signal is improper.)

• ABS actuator and elec-

tric unit (control unit) 

• CAN communication
• RAS  control  unit

STC-78

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

C1929 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

With CONSULT-III

1.

Select “DATA MONITOR” of “4WAS(MAIN)/RAS/HICAS”.

2.

Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to 

STC-

89, "Reference Value"

.

Is each data the standard value?

YES

>> Check that there is no malfunction in each harness connector pin terminal or disconnection.

NO

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

Special Repair Requirement

INFOID:0000000005549726

BEFORE REPLACING RAS CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Never erase the memory (history) of self-diagnosis results when replacing RAS control unit after

diagnosis.

• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR”.

U1000 CAN COMM CIRCUIT

STC-79

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

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U1000 CAN COMM CIRCUIT

Description

INFOID:0000000005549727

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, 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 line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.

DTC Logic

INFOID:0000000005549728

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch from OFF to ON.

2.

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.

Is DTC “U1000” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-79, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005549729

1.

PERFORM SELF-DIAGNOSIS

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.

Is DTC “U1000” detected?

YES

>> Perform CAN diagnosis. Refer to 

LAN-29, "CAN System Specification Chart"

.

NO

>> INSPECTION END

Special Repair Requirement

INFOID:0000000005549730

BEFORE REPLACING RAS CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Never erase the memory (history) of self-diagnosis results when replacing RAS control unit after

diagnosis.

• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR”.

DTC

Display items

Malfunction detected condition

Possible cause

U1000

CAN COMM CIRCUIT

When RAS control unit is not transmitting or receiving 
CAN communication signal for 2 seconds or more.

• CAN communication 

line

• RAS  control  unit

STC-80

< DTC/CIRCUIT DIAGNOSIS >

[WITH REAR ACTIVE STEER]

U1010 CONTROL UNIT (CAN)

U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000005549731

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, 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 line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.

DTC Logic

INFOID:0000000005549732

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch from OFF to ON.

2.

Perform “4WAS(MAIN)/RAS/HICAS” self-diagnosis.

Is DTC “U1010” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-80, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005549733

1.

RAS CONTROL UNIT

Check that there is no malfunction in RAS control unit harness connector or disconnection.

Is the inspection result normal? 

YES

>> Replace RAS control unit. Refer to 

STC-109, "Removal and Installation"

.

NO

>> Repair or replace damaged parts. 

Special Repair Requirement

INFOID:0000000005549734

BEFORE REPLACING RAS CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Never erase the memory (history) of self-diagnosis results when replacing RAS control unit after

diagnosis.

• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR”.

DTC

Display items

Malfunction detected condition

Possible cause

U1010

CONTROL UNIT (CAN)

Detecting error during the initial diagnosis of CAN con-
troller of RAS control unit.

Malfunction of RAS con-
trol unit