Nissan Maxima. Manual - part 892

PCS-48

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B260A IGNITION RELAY

B260A IGNITION RELAY

Description

INFOID:0000000010049426

BCM turns ON the following relays to ignition power supply to each ECU when the ignition switch is turned

ON.

• Ignition relay-1 (inside IPDM E/R)

• Ignition relay-2 (inside fuse block (J/B))

• Front blower motor relay

BCM checks any ignition relay ON request for consistency with the actual ignition relay operation status.

DTC Logic

INFOID:0000000010049427

DTC DETECTION LOGIC

NOTE:

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

PCS-44, "DTC Logic"

.

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

PCS-45, "DTC Logic"

.

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

PCS-60, "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.

-

CVT selector lever is in the P or N position.

-

Release the brake pedal.

2. Check “Self diagnostic result” with CONSULT. 
Is DTC detected?

YES

>> Go to 

PCS-48, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010049428

Regarding Wiring Diagram information, refer to 

PCS-103, "Wiring Diagram"

.

1.

CHECK DATA MONITOR

1. Turn ignition switch ON.

2. Check IGN RLY1-REQ and IGN RLY status with CONSULT. Refer to 

PCS-13, "CONSULT Function (IPDM

E/R)"

.

Do IGN RLY1-REQ and IGN RLY signals change as expected?

YES

>> Refer to 

GI-41, "Intermittent Incident"

.

NO

>> IGN RLY1-REQ does not change. GO TO 2.

NO

>> IGN RLY does not change. GO TO 3.

2.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to 

LAN-24, "CAN System Specification Chart"

.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-79, "Removal and Installation"

.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B260A

IGNITION RELAY

BCM detects a difference of signal for 2 seconds or 
more between the following information.
• Ignition relay-1 (ON/OFF) operation
• Ignition relay-1 feedback

• Harness or connectors

(Ignition relay-1 operation circuit is 
open or shorted.)

PCS

B260A IGNITION RELAY

PCS-49

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

NO

>> Repair harness of connector.

3.

CHECK IGNITION RELAY-1 SIGNAL

1. Turn ignition switch OFF.

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

ground.

3. Turn ignition switch ON.

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

ground.

Are the inspection results normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-35, "Removal and

Installation"

.

NO

>> Repair harness of connector.

(+)

(–)

Voltage

IPDM E/R

Connector

Terminal

E18

27

Ground

Battery voltage

AWMIA1120ZZ

(+)

(–)

Voltage

IPDM E/R

Connector

Terminal

E18

27

Ground

0 V

AWMIA1121ZZ

PCS-50

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2614 ACC RELAY CIRCUIT

B2614 ACC RELAY CIRCUIT

Description

INFOID:0000000010049429

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:0000000010049430

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

 PERFORM DTC CONFIRMATION PROCEDURE

1. Turn the power supply position to ACC under the following conditions, and wait for at least 1 second.

-

CVT selector lever is in the P or N position.

-

Release the 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:0000000010049431

Regarding Wiring Diagram information, refer to 

PCS-103, "Wiring Diagram"

.

1.

 CHECK ACCESSORY RELAY-1 POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect accessory relay-1.

3. Check voltage between accessory relay-1 harness connector

and ground under the following conditions.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> GO TO 2

2.

 CHECK ACCESSORY RELAY-1 POWER SUPPLY CIRCUIT-1

1. Turn ignition switch OFF.

2. Disconnect BCM harness connector.

3. Check continuity between accessory relay-1 harness connector  and BCM harness connector.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2614

ACC relay circuit

An immediate operation of ACC relay-1 is request-
ed by BCM, but there is no response for more than 
1 second.

• Harness or connectors

(ACC relay-1 circuit is open or 
shorted)

• ACC-1 relay

Accessory relay-

1

Ground

Condition

Voltage (V)

Terminal

2

Ground

Ignition

OFF

0

ACC

Battery voltage

ALMIA0443ZZ

PCS

B2614 ACC RELAY CIRCUIT

PCS-51

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

4. Check continuity between accessory relay-1 harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6

NO

>> Repair or replace harness.

3.

 CHECK ACCESSORY RELAY-1 GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between accessory relay-1 harness connector

and ground.

Is the inspection result normal?

YES

>> GO TO 4

NO

>> Repair or replace harness.

4.

 CHECK ACCESSORY RELAY-1 POWER SUPPLY CIRCUIT-2

Check voltage between accessory relay-1 harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 5

NO

>> Repair or replace harness.

5.

 CHECK ACCESSORY RELAY-1

Refer to 

PCS-51, "Component Inspection (Accessory Relay-1)"

.

YES or NO

YES

>> GO TO 6

NO

>> Replace accessory relay-1.

6.

 CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

>> Inspection End.

Component Inspection (Accessory Relay-1)

INFOID:0000000010049432

1.

 CHECK ACCESSORY RELAY-1

1. Turn ignition switch OFF.

2. Remove accessory relay-1.

Accessory relay-1

BCM

Continuity

Terminal

Connector

Terminal

2

M19

83

Yes

Accessory relay-1

Ground

Continuity

Terminal

2

Ground

No

Accessory relay-1

Ground

Continuity

Terminal

1

Ground

Yes

ALMIA0445ZZ

Accessory relay-1

Ground

Voltage (V)

Terminal

3

Ground

Battery voltage

ALMIA0441ZZ