Infiniti G37 Coupe. Manual - part 974

PCS

B2616 IGNITION RELAY CIRCUIT

PCS-65

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

3.

Check the continuity between ignition relay terminals under the
following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace Ignition relay

Terminals

Condition

Continuity

3 and 5

12 V direct current supply between terminals 1 and 2

Existed

No current supply

Not existed

PBIB0098E

PCS-66

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2618 BCM

B2618 BCM

Description

INFOID:0000000001675288

BCM controls the various electrical components and simultaneously supplies power according to the power
supply position.
BCM checks the power supply position internally.

DTC Logic

INFOID:0000000001675289

DTC DETECTION LOGIC

NOTE:
• If DTC B2618 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

PCS-48, "DTC Logic"

.

• If DTC B2618 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to

PCS-49, "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 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 

PCS-66, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001675290

1.

INSPECTION START

1.

Turn ignition switch ON.

2.

Select “Self diagnostic result” mode with CONSULT-III.

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

PCS-66, "DTC Logic"

.

Is the 1st trip DTC B2618 displayed again?

YES

>> Replace BCM. Refer to 

BCS-79, "Removal and Installation"

NO

>> INSPECTION END

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2618

BCM

An immediate operation of ignition relay (IPDM E/
R) is requested by BCM, but there is no response 
for more than 1 second

• BCM

PCS

B261A PUSH-BUTTON IGNITION SWITCH

PCS-67

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

B261A PUSH-BUTTON IGNITION SWITCH

Description

INFOID:0000000001675291

BCM transmits the change in the power supply position with the push-button ignition switch to IPDM E/R via
the CAN communication line. IPDM E/R transmits the power supply position status via CAN communication
line to BCM.

DTC Logic

INFOID:0000000001675292

DTC DETECTION 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 

PCS-67, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001675293

1.

CHECK PUSH-BUTTON IGNITION SWITCH OPERATION

Press push-button ignition switch and check if it turns to ON.

Does ignition switch turn to ON?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK IGNITION SWITCH OUTPUT SIGNAL (IPDM E/R)

1.

Disconnect push-button ignition switch harness connector.

2.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace IPDM E/R. Refer to 

PCS-34, "Removal and Installation"

.

3.

CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT (IPDM E/R)

1.

Disconnect IPDM E/R harness connector E5 and BCM harness connector M122.

2.

Check continuity between IPDM E/R harness connector and push-button ignition switch harness connec-
tor.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B261A

PUSH-BUTTON IG-
NITION SWITCH

 BCM detects a difference of signal for 1 second or 
more between the following information. 
• Power supply position by push-button ignition 

switch

• Power supply position from IPDM E/R (CAN)

• Harness or connectors

(Push-button ignition switch circuit 
is open or shorted.)

IPDM E/R

Ground

Voltage (V)

Connector

Terminal

E5

28

Ground

Battery voltage

PCS-68

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B261A PUSH-BUTTON IGNITION SWITCH

3.

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

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

4.

CHECK IGNITION SWITCH OUTPUT SIGNAL (BCM)

1.

Disconnect push-button ignition switch harness connector.

2.

Check voltage between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace BCM. Refer to 

BCS-79, "Removal and Installation"

.

5.

CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT (BCM)

1.

Disconnect BCM harness connector and IPDM E/R harness connector.

2.

Check continuity between BCM harness connector and push-button ignition switch harness connector.

3.

Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

IPDM E/R

Push-button ignition switch

Continuity

Connector

Terminal

Connector

Terminal

E5

28

M50

4

Existed

IPDM E/R

Ground

Continuity

Connector

Terminal

E5

28

Ground

Not existed

BCM

Ground

Voltage (V)

Connector

Terminal

M122

89

Ground

Battery voltage

BCM

Push-button ignition switch

Continuity

Connector

Terminal

Connector

Terminal

M122

89

M50

4

Existed

BCM

Ground

Continuity

Connector

Terminal

M122

89

Ground

Not existed