Infiniti G37 Coupe. Manual - part 1150

B261A PUSH-BUTTON IGNITION SWITCH

SEC-97

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

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B261A PUSH-BUTTON IGNITION SWITCH

Description

INFOID:0000000001700011

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

DTC Logic

INFOID:0000000001700012

DTC DETECTION LOGIC

NOTE:
• If DTC B261A is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

SEC-36, "DTC Logic"

.

• If DTC B261A 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

1.

Press push-button ignition switch for 1 second under the following condition.

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-97, "Diagnosis Procedure"

NO

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE 2

1.

Insert Intelligent Key into the key slot.

2.

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

3.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-97, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001700013

1.

INSPECTION START

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B261A

PUSH-BUTTON 
IGNITION 
SWITCH

BCM detects the mismatch between the following for 
1 second or more
• Power supply position with push-button ignition 

switch

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

• Harness or connectors

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

- Between BCM and push-button igni-

tion switch

- Between IPDM E/R and push-button 

ignition switch

SEC-98

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

B261A PUSH-BUTTON IGNITION SWITCH

Check the case in which DTC is detected.
• Case1: It is detected when push-button ignition switch is pressed for 1 second
• Case2: It is detected after Intelligent Key is inserted into key slot and push-button ignition switch is pressed

In which case is DTC detected?

Case1 >> GO TO 2.
Case2 >> GO TO 4.

2.

CHECK PUSH-BUTTON IGNITION SWITCH OUTPUT SIGNAL 1

1.

Turn ignition switch OFF.

2.

Disconnect push-button ignition switch connector and IPDM E/R connector E5.

3.

Check voltage between push-button ignition switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 3.

3.

CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT

1.

Disconnect BCM connector M122.

2.

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

3.

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

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

4.

CHECK PUSH-BUTTON IGNITION SWITCH OUTPUT SIGNAL 2

1.

Turn ignition switch OFF.

2.

Disconnect push-button ignition switch connector and BCM connector M122.

3.

Check voltage between push-button ignition switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK PUSH-BUTTON IGNITION SWITCH

1.

Disconnect IPDM E/R connector E5.

2.

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

Push-button ignition switch

Ground

Voltage (V)

Connector

Terminal

M50

4

Ground

Battery voltage

Push-button ignition switch

BCM

Continuity

Connector

Terminal

Connector

Terminal

M50

4

M122

89

Existed

Push-button ignition switch

Ground

Continuity

Connector

Terminal

M50

4

Ground

Not existed

Push-button ignition switch

Ground

Voltage (V)

Connector

Terminal

M50

4

Ground

Battery voltage

B261A PUSH-BUTTON IGNITION SWITCH

SEC-99

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

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3.

Check continuity between push-button ignition switch 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

Push-button ignition switch

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

M50

4

E5

28

Existed

Push-button ignition switch

Ground

Continuity

Connector

Terminal

M50

4

Ground

Not existed

SEC-100

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

B261E VEHICLE TYPE

B261E  VEHICLE TYPE

Description

INFOID:0000000001700014

There are two types of vehicle.
• HEV
• Conventional

DTC Logic

INFOID:0000000001700015

DTC DETECTION LOGIC

NOTE:
• If DTC B261E is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

SEC-36, "DTC Logic"

.

• If DTC B261E 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.

2.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-100, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001700016

1.

INSPECTION START

1.

Turn ignition switch ON.

2.

Check “Self diagnostic result” with CONSULT-III.

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

SEC-100, "DTC Logic"

.

Is the 1st trip DTC B261E 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

B261E

VEHICLE TYPE

Difference of BCM configration

• BCM