Infiniti QX56 (Z62). Manual - part 1184

SEC-126

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B20A0 CRANKING REQUEST CIRCUIT

5.

Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

REPLACE IPDM E/R

1.

Replace IPDM E/R. Refer to 

PCS-32, "Removal and Installation"

.

2.

Perform DTC CONFIRMATION PROCEDURE for DTC B20A0. Refer to 

SEC-125, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 4.

NO

>> INSPECTION END

4.

REPLACE ECM

1.

Replace ECM. Refer to 

EC-535, "Removal and Installation"

.

2.

Perform “ADDITIONAL SERVICE WHEN REPLACING ECM”. Refer to 

EC-143, "Work Procedure"

.

>> INSPECTION END

IPDM E/R

ECM

Continuity

Connector

Terminal

Connector

Terminal

E13

23

E80

165

Existed

IPDM E/R

Ground

Continuity

Connector

Terminal

E13

23

Not existed

B2108 STEERING LOCK RELAY

SEC-127

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

B2108 STEERING LOCK RELAY

DTC Logic

INFOID:0000000006226286

DTC DETECTION LOGIC

NOTE:
• If DTC B2108 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

PCS-22, "DTC Index"

.

• If DTC B2108 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Press push-button ignition switch under the following conditions and wait 1 second or more.

-

Selector lever: In the P position

-

Brake pedal: Not depressed

2.

Check DTC in “Self Diagnostic Result” mode of “IPDM E/R” using CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-127, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006226287

1.

CHECK STEERING LOCK RELAY

Check voltage between IPDM E/R harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace IPDM E/R. Refer to 

PCS-32, "Removal and Installation"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B2108

STRG LCK RELAY ON

IPDM E/R detects that steering lock relay is 
stuck in the ON position for approximately 1 
second even if IPDM E/R receives steering lock 
relay OFF signal from BCM.

• Harness or connectors

(CAN communication line is open 
or shorted.)

• IPDM  E/R

(+)

(–)

Condition

Voltage (V)

(Approx.)

IPDM E/R

Connector

Terminal

E14

46

Ground

Ignition switch 
OFF

A few seconds after 
opening the driver door

Battery voltage

Ignition switch 
LOCK

Press the push-button 
ignition switch

Battery voltage

Ignition switch ACC or ON

0

SEC-128

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B2109 STEERING LOCK RELAY

B2109 STEERING LOCK RELAY

DTC Logic

INFOID:0000000006226288

DTC DETECTION LOGIC

NOTE:
• If DTC B2109 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

PCS-32, "Removal and Installation"

.

• If DTC B2109 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
• When IPDM E/R power supply voltage is low (Approx. 7 - 8 V for about 1 second), the DTC B2109 may be

detected.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Press push-button ignition switch under the following conditions and wait 1 second or more.

-

Selector lever: In the P position

-

Brake pedal: Not depressed

2.

Check DTC in “Self Diagnostic Result” mode of “IPDM E/R” using CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-128, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006226289

1.

CHECK POWER SUPPLY CIRCUIT

Check IPDM E/R power supply circuit. Refer to 

PCS-31, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the malfunctioning part.

2.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check 10 A fuse (No. 44, located in IPDM E/R).

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-32, "Removal and Installation"

.

NO

>> Replace the blown fuse after repairing the cause of ffected circuit if a fuse is blown.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B2109

STRG LCK RELAY OFF

IPDM E/R detects that steering lock relay is 
stuck in the OFF position for approximately 1 
second even if IPDM E/R receives steering 
lock relay ON/OFF signal from BCM.

• Harness or connector

(CAN communication line is open or 
shorted.)

• Harness or connector

(Power supply circuit for steering lock 
relay is open or shorted.)

• IPDM  E/R
• Battery

B210A STEERING LOCK UNIT

SEC-129

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

B210A STEERING LOCK UNIT

DTC Logic

INFOID:0000000006226290

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE 1

1.

Press push-button ignition switch under the following conditions and wait 1 second or more.

-

Selector lever: In the P position

-

Brake pedal: Not depressed

2.

Check DTC in “Self Diagnostic Result” mode of “IPDM E/R” using CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-129, "Diagnosis Procedure"

.

NO

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE 2

1.

Turn ignition switch ON.

2.

Turn ignition switch OFF.

3.

Press driver side door switch and wait 1 second or more.

4.

CCheck DTC in “Self Diagnostic Result” mode of “IPDM E/R” using CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-129, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006226291

1.

CHECK IPDM E/R INPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Check voltage between IPDM E/R harness connector and ground.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-32, "Removal and Installation"

.

NO

>> GO TO 2.

2.

CHECK IPDM E/R INPUT SIGNAL CIRCUIT

1.

Disconnect IPDM E/R connector and steering lock unit connector.

2.

Check continuity between IPDM E/R harness connector and steering lock unit harness connector.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B210A

STRG LCK STATE SW

IPDM E/R detects the difference between 
steering condition switches 1 and 2 signals 
for 1 second. 

• Harness or connectors

(Steering lock unit circuit is open or 
shorted.)

• Steering lock unit 
• IPDM E/R
• BCM

(+)

(–)

Condition

Voltage (V)

(Approx.)

IPDM E/R

Connector

Terminal

E17

63

Ground

Steering lock unit

Lock

12

Unlock

0

65

Lock

0

Unlock

12