Nissan Quest E52. Manual - part 300

DAS-42

< DTC/CIRCUIT DIAGNOSIS >

[BSW]

C1A00 CONTROL UNIT

DTC/CIRCUIT DIAGNOSIS

C1A00 CONTROL UNIT

DTC Logic

INFOID:0000000009940693

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Perform “All DTC Reading” with CONSULT. 

3.

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

Is “C1A00” detected as the current malfunction?

YES

>> Refer to 

DAS-42, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009940694

1.

CHECK SELF-DIAGNOSIS RESULTS

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

YES

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

DAS-23, "DTC Index"

.

NO

>> Replace the BSW control module. Refer to 

DAS-84, "Removal and Installation"

. 

DTC

Trouble diagnosis name

DTC detecting condition

Possible causes

C1A00

CONTROL UNIT

BSW control module internal malfunction

BSW control module

DAS

C1A01 POWER SUPPLY CIRCUIT 1, C1A02 POWER SUPPLY CIRCUIT 2

DAS-43

< DTC/CIRCUIT DIAGNOSIS >

[BSW]

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C1A01 POWER SUPPLY CIRCUIT 1, C1A02 POWER SUPPLY CIRCUIT 2

DTC Logic

INFOID:0000000009940695

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Turn the BSW system ON.

3.

Perform “All DTC Reading” with CONSULT. 

4.

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

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

YES

>> Refer to 

DAS-43, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-42, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000009940696

1.

CHECK BSW CONTROL MODULE POWER SUPPLY AND GROUND CIRCUIT

Check power supply and ground circuit of BSW control module. Refer to 

DAS-75, "BSW CONTROL MODULE

: Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Replace the BSW control module. Refer to 

DAS-84, "Removal and Installation"

. 

NO

>> Repair or replace the malfunctioning parts. 

DTC

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A01

POWER SUPPLY 
CIR

The battery voltage sent to BSW control module 
remains less than 7.9 V for 5 seconds

• Connector, harness, fuse
• BSW control module

C1A02

POWER SUPPLY 
CIR 2

The battery voltage sent to BSW control module 
remains more than 19.3 V for 5 seconds

DAS-44

< DTC/CIRCUIT DIAGNOSIS >

[BSW]

C1A03 VEHICLE SPEED SENSOR

C1A03 VEHICLE SPEED SENSOR

DTC Logic

INFOID:0000000009940697

DTC DETECTION LOGIC

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

DAS-53, "BSW

CONTROL MODULE : DTC Logic"

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Turn the BSW 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. 

6.

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

Is “C1A03” detected as the current malfunction?

YES

>> Refer to 

DAS-44, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-42, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000009940698

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “U1000” is detected other than “C1A03” in “Self Diagnostic Result” of “BSW”. 
Is “U1000” detected?

YES

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

Refer to 

DAS-53, "BSW CONTROL MODULE : 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-38, "DTC Index"

. 

NO

>> Replace the BSW control module. Refer to 

DAS-84, "Removal and Installation"

. 

DTC

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A03

VHCL SPEED SE 
CIRC

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

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

unit)

• BSW control module

DAS

C1B50 SIDE RADAR MALFUNCTION

DAS-45

< DTC/CIRCUIT DIAGNOSIS >

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C1B50 SIDE RADAR MALFUNCTION

DTC LOGIC

INFOID:0000000009940699

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Perform “All DTC Reading” with CONSULT. 

3.

Check if the “C1B50” is detected as the current malfunction in “Self Diagnostic Result” of “SIDE RADAR
RIGHT/LEFT”. 

Is the “C1B50” detected as the current malfunction?

YES

>> Refer to 

DAS-45, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009940700

1.

CHECK SELF-DIAGNOSIS RESULT

Check if any DTC other than “C1B50” is detected in “Self Diagnostic Result” of “SIDE RADAR LEFT/RIGHT”
Is any DTC detected?

YES

>> Perform diagnosis on the detected DTC and repair or replace the malfunction part. Refer to 

DAS-

28, "DTC Index"

 (SIDE RADAR RIGHT) or 

DAS-26, "DTC Index"

 (SIDE RADAR LEFT).

NO

>> Replace the side radar. Refer to 

DAS-85, "Removal and Installation"

.

DTC

Trouble diagnosis name

DTC detecting condition

Possible causes

C1B50

SIDE RDR MALFUNC-
TION

Side radar malfunction

Side radar