Infiniti QX56 (Z62). Manual - part 978

PCS-68

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B26F2 IGNITION RELAY

B26F2 IGNITION RELAY

DTC Logic

INFOID:0000000006220218

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-68, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006220219

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

1.

Turn ignition switch OFF.

2.

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

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

>> GO TO 3.

3.

CHECK IGNITION RELAY (IPDM E/R) CONTROL SIGNAL CIRCUIT - 1

1.

Disconnect BCM and IPDM E/R connectors.

2.

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

Is the inspection result normal?

YES

>> GO TO 4.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B26F2

IGN RELAY ON

BCM transmits the ignition relay control signal 
(OFF: 12 V) or ignition switch ON signal (OFF) 
(CAN), but does not receives ignition switch 
ON signal (OFF) (CAN) from IPDM E/R.

• Harness or connectors

(Ignition relay circuit is short)

• BCM
• IPDM E/R

(+)

(–)

Condition

Voltage (V)

(Approx.)

IPDM E/R

Connector

Terminal

E17

68

Ground

Ignition switch

OFF or ACC

12

IPDM E/R

Ground

Continuity

Connector

Terminal

E17

68

Not existed

PCS

B26F2 IGNITION RELAY

PCS-69

< 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.

4.

CHECK IGNITION RELAY (IPDM E/R) CONTROL SIGNAL CIRCUIT - 2

1.

Connect IPDM E/R connectors.

2.

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

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

NO

>> Replace IPDM E/R.

(+)

(–)

Condition

Voltage (V)

(Approx.)

IPDM E/R

Connector

Terminal

E17

68

Ground

Ignition switch

OFF or ACC

12

PCS-70

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B26F6 BCM

B26F6 BCM

DTC Logic

INFOID:0000000006220220

DTC DETECTION LOGIC

NOTE:
• If DTC B26F6 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

BCS-70, "DTC Logic"

.

• If DTC B26F6 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.

Turn ignition switch ON 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-70, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006220221

1.

INSPECTION START

1.

Turn ignition switch ON.

2.

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

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

PCS-70, "DTC Logic"

.

Is DTC detected?

YES

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

NO

>> INSPECTION END

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B26F6

BCM

Ignition relay ON signal is not transmitted from IPDM E/
R when BCM turns ignition relay ON.

BCM

PCS

PUSH-BUTTON IGNITION SWITCH

PCS-71

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

PUSH-BUTTON IGNITION SWITCH

Component Function Check

INFOID:0000000006220222

1.

CHECK FUNCTION

1.

Select “PUSH SW” in “Data Monitor” of BCM with CONSULT-III. 

2.

Check the push-button ignition switch signal under the following conditions.

Is the indication normal?

YES

>> INSPECTION END.

NO

>> Go to  

PCS-71, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006220223

1.

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.

3.

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 1

1.

Disconnect BCM 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

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

NO

>> Repair or replace harness.

3.

CHECK PUSH-BUTTON IGNITION SWITCH OUTPUT SIGNAL 2

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

Test item

Condition

Status

PUSH SW

Push-button ignition switch is pressed

ON

Push-button ignition switch is not pressed

OFF

(+)

(–)

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

BCM

Ground

Continuity

Connector

Terminal

M71

100

Not existed