Infiniti G37 Coupe. Manual - part 1151

B2108 STEERING LOCK RELAY

SEC-101

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

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B2108 STEERING LOCK RELAY

Description

INFOID:0000000001700017

The steering lock relay ON signal is transmitted to IPDM E/R by BCM via CAN communication.
IPDM E/R turns the steering lock relay ON and transmits the release of the steering to BCM.

DTC Logic

INFOID:0000000001700018

DTC DETECTION LOGIC

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

PCS-

16, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Press the push-button ignition switch under the following conditions and wait for at least 1 second.

A/T models

-

A/T selector lever is in the P or N position

-

Do not depress brake pedal

M/T models

-

Do not depress clutch pedal

2.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-101, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001700019

1.

CHECK STEERING LOCK RELAY

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

Is the inspection normal?

YES

>> GO TO 2.

NO

>> Replace IPDM E/R. Refer to 

PCS-34, "Removal and Installation"

.

2.

CHECK INTEMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2108

STRG LCK RELAY 
ON

IPDM E/R detects that the relay is stuck at ON po-
sition for about 1 second even if the IPDM E/R re-
ceives steering lock relay ON/OFF signal from 
BCM.

• IPDM  E/R

IPDM E/R

(–)

Condition

Voltage (V)

(+)

Connector

Terminal

E5

11

Ground

Ignition switch ACC or ON

0

SEC-102

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

B2109 STEERING LOCK RELAY

B2109 STEERING LOCK RELAY

Description

INFOID:0000000001700020

The steering lock relay ON signal is transmitted to IPDM E/R by BCM via CAN communication.
IPDM E/R turns the steering lock relay ON and transmits the release of the steering to BCM.

DTC Logic

INFOID:0000000001700021

DTC DETECTION LOGIC

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

PCS-16, "DTC Logic"

.

• 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 the push-button ignition switch under the following conditions and wait for at least 1 second.

A/T models

-

A/T selector lever is in the P or N position

-

Do not depress brake pedal

M/T models

-

Do not depress clutch pedal

2.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-102, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001700022

1.

CHECK POWER SUPPLY CIRCUIT

Check IPDM E/R power supply circuit. Refer to 

SEC-119, "IPDM E/R (INTELLIGENT POWER DISTRIBU-

TION MODULE ENGINE ROOM) : Diagnosis Procedure"

.

Is the circuit normal?

YES

>> GO TO 2.

NO

>> Repair the malfunctioning part.

2.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check 10A fuse (No. 48, located in IPDM E/R).

Is the inspection normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-34, "Removal and Installation"

.

NO

>>

Check the following.

• Harness for open or short between IPDM E/R and battery
• Fuse

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2109

STRG LCK RELAY 
OFF

IPDM E/R detects that the relay is stuck at OFF po-
sition for about 1 second even if the IPDM E/R re-
ceives steering lock relay ON/OFF signal from 
BCM.

• Harness or connector (power sup-

ply circuit)

• IPDM E/R
• Battery

B210A STEERING LOCK CONDITION SWITCH

SEC-103

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

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B210A STEERING LOCK CONDITION SWITCH

Description

INFOID:0000000001700023

There are 2 switches in the steering unit. IPDM E/R compares those 2 switches conditions to judge the
present steering status and transmit the result to BCM via CAN communication.

DTC Logic

INFOID:0000000001700024

DTC DETECTION LOGIC

NOTE:
If DTC B210A is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to 

PCS-

16, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE 1

1.

Press the push-button ignition switch under the following conditions and wait for at least 1 second.

A/T models

-

A/T selector lever is in the P or N position

-

Do not depress brake pedal

M/T models

-

Do not depress clutch pedal

2.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-103, "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 for at least 1 second.

4.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-103, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001700025

1.

INSPECTION START

Check the case in which DTC is detected.
• Case1: It is detected after ignition switch is changed from OFF to ON
• Case2: It is detected after ignition switch is changed from ON to OFF and door switch is pressed

In which case is DTC detected?

Case1 >> GO TO 2.
Case2 >> GO TO 6.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B210A

STRG LCK STATE 
SW

BCM detects the mismatch between the following 
for 1 second
• Steering lock or unlock
• Feedback of steering lock status from IPDM E/R 

(CAN)

• Harness or connectors

[steering lock unit circuit (BCM 
side) is open or shorted]

• Harness or connectors

[steering lock unit circuit (IPDM E/
R side) is open or shorted.]

• Steering lock unit 
• IPDM  E/R

SEC-104

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

B210A STEERING LOCK CONDITION SWITCH

2.

CHECK BCM OUTPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect steering lock unit connector and IPDM E/R connector E5.

3.

Check voltage between steering lock unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK STEERING LOCK UNIT CIRCUIT-1

1.

Disconnect BCM connector M122.

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 10.

NO

>> Repair harness or connector.

4.

CHECK IPDM E/R OUTPUT SIGNAL

1.

Connect IPDM E/R connector E5.

2.

Disconnect BCM connector M122.

3.

Check voltage between steering lock unit harness connector and ground.

Is the inspection result normal?

YES

>> Replace steering lock unit.

NO

>> GO TO 5.

5.

CHECK STEERING LOCK UNIT CIRCUIT-2

1.

Disconnect IPDM E/R connector.

2.

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

3.

Check continuity between steering lock unit harness connector and ground.

Steering lock unit

Ground

Voltage [V]

Connector

Terminal

M40

8

Ground

Battery voltage

Steering lock unit

BCM

Continuity

Connector

Terminal

Connector

Terminal

M40

8

M122

98

Existed

Steering lock unit

Ground

Continuity

Connector

Terminal

M40

8

Ground

Not existed

Steering lock unit

Ground

Voltage [V]

Connector

Terminal

M40

8

Ground

Battery voltage

Steering lock unit

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

M40

8

E5

33

Existed

Steering lock unit

Ground

Continuity

Connector

Terminal

M40

8

Ground

Not existed