Infiniti QX56 (Z62). Manual - part 977

PCS-64

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B261A PUSH-BUTTON IGNITION SWITCH

B261A PUSH-BUTTON IGNITION SWITCH

DTC Logic

INFOID:0000000006220214

DTC DETECTION LOGIC

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

BCS-70, "DTC Logic"

.

• If DTC B261A is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to

BCS-71, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

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

-

Selector lever is in the P or N position

-

Do not depress brake pedal

2.

Check “Self-diagnosis result” of BCM with CONSULT-III. 

Is DTC detected?

YES

>> Go to 

PCS-64, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006220215

1.

CHECK IGNITION SWITCH OUTPUT SIGNAL (PUSH-BUTTON IGNITION SWITCH)

1.

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

2.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT (BCM)

1.

Disconnect BCM connector.

2.

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

3.

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

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B261A

PUSH-BTN IGN SW

 BCM detects a difference of signal for 1 second or 
more between the following items. 
• Push-button ignition switch signal
• Push-button ignition switch status signal (CAN)

• Harness or connectors

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

• BCM
• IPDM E/R

(+)

(–)

Voltage (V)

(Approx.)

Push-button ignition switch

Connector

Terminal

M101

4

Ground

12

BCM

Push-button ignition switch

Continuity

Connector

Terminal

Connector

Terminal

M71

100

M101

4

Existed

Push-button ignition switch

Ground

Continuity

Connector

Terminal

M101

4

Not existed

PCS

B261A PUSH-BUTTON IGNITION SWITCH

PCS-65

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

NO

>> Repair or replace harness.

3.

CHECK IGNITION SWITCH OUTPUT SIGNAL (IPDM E/R)

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

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

>> GO TO 4.

4.

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

1.

Disconnect IPDM E/R connector.

2.

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

3.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

(+)

(–)

Voltage (V)

(Approx.)

IPDM E/R

Connector

Terminal

E17

66

Ground

12

IPDM E/R

Push-button ignition switch

Continuity

Connector

Terminal

Connector

Terminal

E17

66

M101

4

Existed

Push-button ignition switch

Ground

Continuity

Connector

Terminal

M101

4

Not existed

PCS-66

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B26F1 IGNITION RELAY

B26F1 IGNITION RELAY

DTC Logic

INFOID:0000000006220216

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON under the following conditions, and wait for 2 seconds or more.

-

Selector lever is in the P or N position

-

Do not depress brake pedal

2.

Check “Self-diagnosis result” of BCM with CONSULT-III. 

Is DTC detected?

YES

>> Go to 

PCS-66, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006220217

1.

CHECK IPDM E/R SELF-DIAGNOSTIC RESULT

1.

Turn ignition switch ON.

2.

Erase the DTC of IPDM E/R.

3.

Turn ignition switch OFF.

4.

Turn ignition switch ON and check the DTC again.

Is DTC detected?

YES

>> Repair or replace the malfunctioning part. Refer to 

PCS-22, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK IGNITION RELAY (IPDM E/R) CONTROL SIGNAL

Check voltage between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

3.

CHECK IGNITION RELAY (IPDM E/R) CONTROL SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect BCM and IPDM connectors.

3.

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

Is the inspection result normal?

YES

>> Replace IPDM E/R.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B26F1

IGN RELAY OFF

BCM transmits the ignition relay control signal 
(ON: 0 V) or ignition switch ON signal (ON) 
(CAN), but does not receives ignition switch 
ON signal (ON) (CAN) from IPDM E/R.

• Harness or connectors

(Ignition relay circuit is open)

• BCM
• IPDM E/R

(+)

(–)

Condition

Voltage (V)

(Approx.)

BCM

Connector

Terminal

M71

98

Ground

Ignition switch

ON

0

BCM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

M71

98

E17

68

Existed

PCS

B26F1 IGNITION RELAY

PCS-67

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

NO

>> Repair or replace harness.