Infiniti G37 Coupe. Manual - part 1144

B2604 PNP SWITCH

SEC-73

< COMPONENT DIAGNOSIS >

[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 3.

NO

>> Repair harness or connector.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END.

A/T assembly

Ground

Continuity

Connector

Terminal

F51

9

Ground

Not existed

SEC-74

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

B2605 PNP SWITCH

B2605 PNP SWITCH

Description

INFOID:0000000001699972

BCM confirms the shift position with the following 4 signals.
• A/T selector lever
• P/N position switch
• P position signal from IPDM E/R (CAN)
• P position signal from TCM (CAN)

DTC Logic

INFOID:0000000001699973

DTC DETECTION LOGIC

NOTE:
• If DTC B2605 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

SEC-36, "DTC Logic"

.

• If DTC B2605 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to

SEC-37, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON under the following conditions and wait for at least 1 second.

-

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

-

Do not depress the brake pedal.

2.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-74, "Diagnosis Procedure"

.

NO

>> INSPECTION END.

Diagnosis Procedure

INFOID:0000000001699974

1.

CHECK DTC WITH IPDM E/R

Check “Self diagnostic result” with CONSULT-III. Refer to 

SEC-214, "DTC Index"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> repair or replace the malfunctioning parts.

2.

CHECK PNP SWITCH CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect A/T assembly connector and BCM connector M123.

3.

Check continuity between A/T assembly connector and BCM harness connector.

4.

Check continuity between A/T assembly harness connector and ground.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2605

PNP SWITCH

BCM detects the following status for 500 ms or 
more when the ignition switch is in ON position
• N position input signal exists. Shift position signal 

from IPDM E/R does not exist.

• N position input signal does not exist. Shift posi-

tion signal from IPDM E/R exists.

• Harness or connectors

[Park/neutral position (PNP) switch 
circuit is open or shorted.]

• Park/neutral position (PNP) switch
• IPDM E/R

A/T assembly

BCM

Continuity

Connector

Terminal

Connector

Terminal

F51

9

M123

140

Existed

B2605 PNP SWITCH

SEC-75

< COMPONENT DIAGNOSIS >

[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 3.

NO

>> Repair harness or connector.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END.

A/T assembly

Ground

Continuity

Connector

Terminal

F51

9

Ground

Not existed

SEC-76

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

B2606 STEERING LOCK RELAY

B2606 STEERING LOCK RELAY

Description

INFOID:0000000001699975

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:0000000001699976

DTC DETECTION LOGIC

NOTE:
• If DTC B2606 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

SEC-36, "DTC Logic"

.

• If DTC B2606 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to

SEC-37, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Press the push-button ignition switch under the following conditions.

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.

Steering is locked.

3.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-76, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001699977

1.

CHECK DTC WITH IPDM E/R

Check “Self diagnostic result” with CONSULT-III. Refer to 

SEC-214, "DTC Index"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace IPDM E/R. Refer to 

PCS-34, "Removal and Installation"

.

2.

INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2606

STEERING LOCK 
RELAY

BCM detects that there is a mismatch between the 
following statuses.
• Steering lock unit ON signal transmitted by IPDM 

E/R

• The steering lock unit status feedback 

• Steering lock relay (in IPDM E/R)