Infiniti QX56 (Z62). Manual - part 1170

SEC-70

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B2014 CHAIN OF STRG-IMMU

B2014 CHAIN OF STRG-IMMU

DTC Logic

INFOID:0000000006226220

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Lock steering.
NOTE:

3.

Press the push-button ignition switch.

4.

Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-70, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006226221

1.

CHECK STEERING LOCK UNIT POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect steering lock unit connector.

3.

Check voltage between steering lock unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK STEERING LOCK UNIT POWER SUPPLY CIRCUIT

1.

Disconnect BCM connector.

2.

Check continuity between steering lock unit harness connector and BCM harness connector.

3.

Check continuity between steering lock unit harness connector and ground.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B2014

CHAIN OF S/L-BCM

Inactive communication between steering 
lock unit and BCM

• Harness or connectors

(Steering lock unit circuit is open or 
shorted.)

• Steering lock unit
• BCM

To lock the steering

1.

Set the selector lever in the P position.

2.

Turn the power supply position to the OFF position.

3.

Press any door switch.

To unlock the steering

1.

Set the selector lever in the P position.

2.

Press the push-button ignition switch with brake pedal not depressed.

(+)

(–)

Condition

Voltage (V)

(Approx.)

Steering lock unit

Connector

Terminal

M12

7

Ground

Ignition switch

OFF or ACC

12

ON

0

Steering lock unit

BCM

Continuity

Connector

Terminal

Connector

Terminal

M12

7

M71

95

Existed

B2014 CHAIN OF STRG-IMMU

SEC-71

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace harness.

3.

CHECK STEERING LOCK UNIT GROUND CIRCUIT

Check continuity between steering lock unit and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness.

4.

CHECK STEERING LOCK UNIT COMMUNICATION SIGNAL

1.

Connect steering lock unit connector and BCM connector.

2.

Read voltage signal between steering lock unit harness connector and ground.

NOTE:

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 6.

5.

REPLACE STEERING LOCK UNIT

1.

Replace steering lock unit.

2.

Perform the service procedure for steering lock unit replacement. Refer to CONSULT-III Operation Man-
ual NATS-IVIS/NVIS.

Steering lock unit

Ground

Continuity

Connector

Terminal

M12

7

Not existed

Steering lock unit

Ground

Continuity

Connector

Terminal

M12

5

Existed

6

(+)

(–)

Condition

Voltage (V)

(Approx.)

Steering lock unit

Connector

Terminal

M12

2

Ground

Steering lock unit

Lock status

12

Lock or unlock

For 15 seconds after 
unlock

12

15 seconds or later 
after unlock.

0 

To lock the steering

1.

Set the selector lever in the P position.

2.

Turn the power supply position to the OFF position.

3.

Press any door switch.

To unlock the steering

1.

Set the selector lever in the P position.

2.

Press the push-button ignition switch with brake pedal not depressed.

JMKIA0066GB

SEC-72

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B2014 CHAIN OF STRG-IMMU

>> INSPECTION END

6.

CHECK STEERING LOCK UNIT COMMUNICATION CIRCUIT

1.

Disconnect steering lock unit and BCM connector.

2.

Check continuity between steering lock unit harness connector and BCM harness connector.

3.

Check continuity between steering lock unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace harness.

7.

REPLACE BCM

1.

Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

2.

Perform initialization of BCM and registration of all Intelligent Keys using CONSULT-III.
For initialization and registration procedures, refer to CONSULT-III Operation Manual NATS-IVIS/NVIS.

>> INSPECTION END

Steering lock unit

BCM

Continuity

Connector

Terminal

Connector

Terminal

M12

2

M71

94

Existed

Steering lock unit

Ground

Continuity

Connector

Terminal

M12

2

Not existed

B2555 STOP LAMP

SEC-73

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

B2555 STOP LAMP

DTC Logic

INFOID:0000000006226222

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Depress the brake pedal and wait 1 second or more.

2.

Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-73, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006226223

1.

CHECK STOP LAMP SWITCH INPUT SIGNAL 1

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector.

3.

Check voltage between BCM harness connector and ground.

Is the inspection normal?

YES

>> GO TO 2.

NO-1

>> Check 10 A fuse [No. 7, located in the fuse block (J/B)].

NO-2

>> Check harness for open or short between BCM and fuse.

2.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1.

Disconnect stop lamp switch connector.

2.

Check voltage between stop lamp switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check harness for open or short between stop lamp switch and fuse.

3.

CHECK STOP LAMP SWITCH INPUT SIGNAL 2

1.

Connect stop lamp switch connector.

2.

Check voltage between BCM harness connector and ground.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B2555

STOP LAMP

BCM makes a comparison between the 
upper voltage and lower voltage of stop 
lamp switch. It judges from their values to 
detect the malfunctioning circuit.

• Harness or connectors

(Stop lamp switch circuit is open or 
shorted.)

• Stop lamp switch
• Fuse
• BCM

(+)

(–)

Voltage (V)

(Approx.)

BCM

Connector

Terminal

M71

105

Ground

Battery voltage

(+)

(–)

Voltage (V)

(Approx.)

Stop lamp switch

Connector

Terminal

E115

1

Ground

Battery voltage