Nissan Murano. Manual - part 1072

PCS-50

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2553 IGNITION RELAY

DTC/CIRCUIT DIAGNOSIS

B2553 IGNITION RELAY

Description

INFOID:0000000009722647

BCM turns ON the following relays to ignition power supply to each ECU when the ignition switch is turned
ON.
• Ignition relay (inside fuse box)
• Ignition relay (inside IPDM E/R)
• Blower relay
BCM checks any ignition relay ON request for consistency with the actual ignition relay operation status.

DTC Logic

INFOID:0000000009722648

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON under the following conditions (start the engine), and wait for at least 2 seconds.

-

Selector lever is in the P or N position.

-

Do not depress brake pedal.

2.

Check “Self diagnostic result” with CONSULT. 

Is DTC detected?

YES

>> Go to 

PCS-50, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009722649

1.

CHECK DTC WITH IPDM E/R

Check “Self diagnostic result” with CONSULT. Refer to 

PCS-34, "DTC Index"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning parts.

2.

CHECK FUSE

Check that the following fuse are not fusing.

Is the fuse fusing?

YES

>> Repair the applicable circuit. And then replace the fuse.

NO

>> GO TO 3.

3.

CHECK IGNITION RELAY FEEDBACK INPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector.

3.

Check voltage between BCM harness connector and ground.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2553

IGNITION RELAY

BCM detects a difference of signal for 2 seconds or 
more between the following information. 
• Ignition relay (fuse block) ON/OFF operation
• Ignition relay (fuse block) feedback.

• Harness or connectors

(ignition relay feedback circuit is 
open or short)

• BCM
• IPDM E/R

Signal name

Connection position

Fuse No.

Capacity

Ignition power supply

FUSE BLOCK (J/B)

3

10A

PCS

B2553 IGNITION RELAY

PCS-51

< 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-98, "Removal and Installation"

.

NO

>> GO TO 4.

4.

CHECK IGNITION RELAY FEEDBACK CIRCUIT

1.

Disconnect fuse block (J/B) connector.

2.

Check continuity between BCM harness connector and fuse block (J/B) harness connector.

3.

Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to

PCS-37, "Removal and Installation"

.

NO

>> Repair or replace harness.

(+)

(–)

Condition

Voltage (V)

(Approx.)

BCM

Connector

Terminal

M123

123

Ground

Ignition switch

OFF

0

ON

Battery voltage

BCM

FUSE BLOCK (J/B)

Continuity

Connector

Terminal

Connector

Terminal

M123

123

M1

2A

Existed

BCM

Ground

Continuity

Connector

Terminal

M123

123

Not existed

PCS-52

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B260A IGNITION RELAY

B260A IGNITION RELAY

Description

INFOID:0000000009722650

BCM turns ON the following relays to ignition power supply to each ECU when the ignition switch is turned
ON.
• Ignition relay (inside fuse block)
• Ignition relay (inside IPDM E/R)
• Blower relay
BCM checks any ignition relay ON request for consistency with the actual ignition relay operation status.

DTC Logic

INFOID:0000000009722651

DTC DETECTION LOGIC

NOTE:
• If DTC B260A is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

BCS-42, "DTC Logic"

.

• If DTC B260A is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to

BCS-43, "DTC Logic"

.

• If DTC B260A is displayed with DTC B261A, first perform the trouble diagnosis for DTC B261A. Refer to

PCS-64, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON under the following conditions, and wait for at least 2 seconds.

-

Selector lever is in the P or N position.

-

Do not depress brake pedal.

2.

Check “Self diagnostic result” with CONSULT. 

Is DTC detected?

YES

>> Go to 

PCS-52, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009722652

1.

CHECK DTC WITH IPDM E/R

Check “Self diagnostic result” with CONSULT. Refer to 

PCS-34, "DTC Index"

.

Is DTC detected?

YES

>> Repair or replace the malfunctioning parts.

NO

>> GO TO 2.

2.

CHECK IGNITION RELAY INPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector.

3.

Check voltage between BCM harness connector and ground.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B260A

IGNITION RELAY

BCM detects a difference of signal for 2 second or 
more between the following information.
• Ignition relay (IPDM E/R) operation request
• Ignition relay feedback from IPDM E/R (CAN).

• Harness or connectors

(Ignition relay operation circuit is 
open or shorted.)

• BCM
• IPDM E/R

(+)

(–)

Voltage (V)

(Approx.)

BCM

Connector

Terminal

M121

47

Ground

Battery voltage

PCS

B260A IGNITION RELAY

PCS-53

< 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-98, "Removal and Installation"

.

NO

>> GO TO 3.

3.

CHECK IGNITION RELAY (IPDM E/R) CIRCUIT

1.

Disconnect IPDM E/R connector.

2.

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

3.

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

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to

PCS-37, "Removal and Installation"

.

NO

>> Repair or replace harness.

IPDM E/R

BCM

Continuity

Connector

Terminal

Connector

Terminal

E10

27

M121

47

Existed

IPDM E/R

Ground

Continuity

Connector

Terminal

E10

27

Not existed