Infiniti M (2012 year). Manual - part 4

PCS

POWER DISTRIBUTION SYSTEM

PCS-51

< WIRING DIAGRAM >

[POWER DISTRIBUTION SYSTEM]

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JRMWC4741GB

2012 M

PCS-52

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

DIAGNOSIS AND REPAIR WORK FLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORK FLOW

Work Flow

INFOID:0000000007798071

OVERALL SEQUENCE

DETAILED FLOW

JMKIA8652GB

2012 M

PCS

DIAGNOSIS AND REPAIR WORK FLOW

PCS-53

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

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1.

GET INFORMATION FOR SYMPTOM

1.

Get detailed information from the customer about the symptom (the condition and the environment when
the incident/malfunction occurs).

2.

Check operation condition of the function that is malfunctioning.

>> GO TO 2.

2.

CHECK DTC

1.

Check DTC.

2.

Perform the following procedure if DTC is detected.

-

Record DTC and freeze frame data (Print them out using CONSULT.)

-

Erase DTC.

-

Study the relationship between the cause detected by DTC and the symptom described by the customer.

3.

Check related service bulletins for information.

Are any symptoms described and any DTC detected?

Symptom is described, DTC is detected>>GO TO 3.
Symptom is described, DTC is not detected>>GO TO 4.
Symptom is not described, DTC is detected>>GO TO 5.

3.

CONFIRM THE SYMPTOM

Try to confirm the symptom described by the customer.
Also study the normal operation and fail-safe related to the symptom.
Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 5.

4.

CONFIRM THE SYMPTOM

Try to confirm the symptom described by the customer.
Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 6.

5.

PERFORM DTC CONFIRMATION PROCEDURE

Perform DTC CONFIRMATION PROCEDURE for the detected DTC, and then check that DTC is detected
again. At this time, always connect CONSULT to the vehicle, and check self diagnostic results in real time.
If two or more DTCs are detected, refer to 

BCS-56, "DTC Inspection Priority Chart"

, and determine trouble

diagnosis order.
NOTE:
• Freeze frame data is useful if the DTC is not detected.
• Perform Component Function Check if DTC CONFIRMATION PROCEDURE is not included on Service

Manual. This simplified check procedure is an effective alternative though DTC cannot be detected during
this check.
If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC CONFIR-
MATION PROCEDURE.

Is DTC detected?

YES

>> GO TO 7.

NO

>> Check according to 

GI-44, "Intermittent Incident"

.

6.

DETECT MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS

Detect malfunctioning system according to SYMPTOM DIAGNOSIS based on the confirmed symptom in step
4, and determine the trouble diagnosis order based on possible causes and symptom.

Is the symptom described?

YES

>> GO TO 7.

NO

>> Monitor input data from related sensors or check voltage of related module terminals using CON-

SULT.

7.

DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE

2012 M

PCS-54

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

DIAGNOSIS AND REPAIR WORK FLOW

Inspect according to Diagnostic Procedure of the system.

Is malfunctioning part detected?

YES

>> GO TO 8.

NO

>> Check according to 

GI-44, "Intermittent Incident"

.

8.

REPAIR OR REPLACE THE MALFUNCTIONING PART

1.

Repair or replace the malfunctioning part.

2.

Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-
ment.

3.

Check DTC. If DTC is detected, erase it.

>> GO TO 9.

9.

FINAL CHECK

When DTC is detected in step 2, perform DTC CONFIRMATION PROCEDURE again, and then check that the
malfunction is repaired securely.
When symptom is described by the customer, refer to confirmed symptom in step 3 or 4, and check that the
symptom is not detected.

Is DTC detected and does symptom remain?

YES-1 >> DTC is detected: GO TO 7.
YES-2 >> Symptom remains: GO TO 4.
NO

>> Before returning the vehicle to the customer, always erase DTC.

2012 M

PCS

B2614 ACC RELAY CIRCUIT

PCS-55

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

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DTC/CIRCUIT DIAGNOSIS

B2614 ACC RELAY CIRCUIT

DTC Logic

INFOID:0000000006887735

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 2 second or more.

-

Selector lever is in the P position

-

Do not depress brake pedal

2.

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

Is DTC detected?

YES

>> Go to 

PCS-55, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006887736

1.

CHECK ACCESSORY RELAY POWER SUPPLY-1

1.

Turn ignition switch OFF.

2.

Disconnect accessory relay.

3.

Check voltage between accessory relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK ACCESSORY RELAY POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector.

3.

Check continuity between accessory relay harness connector and BCM harness connector.

4.

Check continuity between accessory relay harness connector and ground.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2614

BCM

An immediate operation of accessory relay is re-
quested by BCM, but there is no response for more 
than 2 second.

• Harness or connectors

(Accessory relay circuit is open or 
shorted)

• BCM
• Accessory relay

(+)

(–)

Condition

Voltage (V)

(Approx.)

Accessory relay

Terminal

1

Ground

Ignition switch

OFF

0

ACC or ON

12

Accessory relay

BCM

Continuity

Terminal

Connector

Terminal

1

M123

96

Existed

2012 M

PCS-56

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2614 ACC RELAY CIRCUIT

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-82, "Removal and Installation"

.

NO

>> Repair or replace harness.

3.

CHECK ACCESSORY RELAY GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between accessory relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair accessory relay ground circuit.

4.

CHECK ACCESSORY RELAY POWER SUPPLY CIRCUIT-2

1.

Turn ignition switch ACC.

2.

Check voltage between accessory relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Check continuity open or short between accessory relay and battery.

5.

CHECK ACCESSORY RELAY

Refer to 

PCS-56, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace accessory relay.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-44, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000006887737

1.

CHECK ACCESSORY RELAY

1.

Turn ignition switch OFF.

2.

Remove accessory relay.

Accessory relay

Ground

Continuity

Terminal

1

Not existed

Accessory relay

Ground

Continuity

Terminal

2

Existed

(+)

(–)

Voltage (V)

(Approx.)

Accessory relay

Terminal

5

Ground

Battery voltage

2012 M

PCS

B2614 ACC RELAY CIRCUIT

PCS-57

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

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3.

Check the continuity between accessory relay terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace accessory relay

Terminals

Condition

Continuity

3 and 5

12 V direct current supply between terminals 1 and 2

Existed

No current supply

Not existed

PBIB0098E

2012 M

PCS-58

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2615 BLOWER RELAY CIRCUIT

B2615 BLOWER RELAY CIRCUIT

DTC Logic

INFOID:0000000006887738

DTC DETECTION 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 position

-

Do not depress brake pedal

2.

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

Is DTC detected?

YES

>> Go to 

PCS-58, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006887739

1.

CHECK BLOWER RELAY POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect blower relay.

3.

Check voltage between blower relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK BLOWER RELAY POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector.

3.

Check continuity between blower relay harness connector and BCM harness connector.

4.

Check continuity between blower relay harness connector and ground.

Is the inspection result normal?

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2615

BCM

BCM detects a difference of signal for 1 second or 
more between the following items.
• Blower relay ON/OFF request 
• Blower relay feedback

• Harness or connectors 

(Blower relay circuit is open or 
shorted)

• BCM
• Blower relay

(+)

(–)

Condition

Voltage (V)

(Approx.)

Blower relay

Terminal

1

Ground

Ignition switch

OFF or ACC

0

ON

Battery voltage

Blower relay

BCM

Continuity

Terminal

Connector

Terminal

1

M123

106

Existed

Blower relay

Ground

Continuity

Terminal

1

Not existed

2012 M

PCS

B2615 BLOWER RELAY CIRCUIT

PCS-59

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

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YES

>> GO TO 6.

NO

>> Repair or replace harness.

3.

CHECK BLOWER RELAY GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between blower relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair blower relay ground circuit.

4.

CHECK BLOWER RELAY POWER SUPPLY CIRCUIT-2

1.

Turn ignition switch ON.

2.

Check voltage between blower relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Check continuity open or short between blower relay and battery.

5.

CHECK BLOWER RELAY

Refer to 

PCS-59, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace blower relay.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-44, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000006887740

1.

CHECK BLOWER RELAY

1.

Turn ignition switch OFF.

2.

Remove blower relay.

3.

Check the continuity between blower relay terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace blower relay

Blower relay

Ground

Continuity

Terminal

2

Existed

(+)

(–)

Voltage (V)

(Approx.)

Blower relay

Terminal

5

Ground

Battery voltage

Terminals

Condition

Continuity

3 and 5

12 V direct current supply between terminals 1 and 2

Existed

No current supply

Not existed

PBIB0098E

2012 M

PCS-60

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2616 IGNITION RELAY CIRCUIT

B2616 IGNITION RELAY CIRCUIT

DTC Logic

INFOID:0000000006887741

DTC DETECTION 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 position

-

Do not depress brake pedal

2.

Check “Self-diagnosis result” with CONSULT. 

Is DTC detected?

YES

>> Go to 

PCS-60, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006887742

1.

CHECK IGNITION RELAY POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect ignition relay.

3.

Check voltage between ignition relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK IGNITION RELAY POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector.

3.

Check continuity between ignition relay harness connector and BCM harness connector.

4.

Check continuity between ignition relay harness connector and ground.

Is the inspection result normal?

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2616

BCM

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

• Harness or connectors 

(Ignition relay circuit is open or 
shorted)

• BCM
• Ignition relay

(+)

(–)

Condition

Voltage (V)

(Approx.)

Ignition relay

Terminal

2

Ground

Ignition switch

OFF or ACC

0

ON

Battery voltage

Ignition relay

BCM

Continuity

Terminal

Connector

Terminal

2

M123

99

Existed

Ignition relay

Ground

Continuity

Terminal

2

Not existed

2012 M

PCS

B2616 IGNITION RELAY CIRCUIT

PCS-61

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

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YES

>> Replace BCM. Refer to 

BCS-82, "Removal and Installation"

.

NO

>> Repair or replace harness.

3.

CHECK IGNITION RELAY GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between ignition relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair ignition relay ground circuit.

4.

CHECK IGNITION RELAY POWER SUPPLY CIRCUIT-2

1.

Turn ignition switch ON.

2.

Check voltage between ignition relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Check continuity open or short between ignition relay and battery.

5.

CHECK IGNITION RELAY

Refer to 

PCS-61, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace ignition relay.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-44, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000006887743

1.

CHECK IGNITION RELAY

1.

Turn ignition switch OFF.

2.

Remove ignition relay.

3.

Check the continuity between ignition relay terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace Ignition relay

Ignition relay

Ground

Continuity

Terminal

1

Existed

(+)

(–)

Voltage (V)

(Approx.)

Ignition relay

Terminal

5

Ground

Battery voltage

Terminals

Condition

Continuity

3 and 5

12 V direct current supply between terminals 1 and 2

Existed

No current supply

Not existed

PBIB0098E

2012 M

PCS-62

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2618 BCM

B2618 BCM

DTC Logic

INFOID:0000000006887744

DTC DETECTION LOGIC

NOTE:
• If DTC B2618 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

BCS-70, "DTC Logic"

.

• If DTC B2618 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. 

Is DTC detected?

YES

>> Go to 

PCS-62, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006887745

1.

INSPECTION START

1.

Turn ignition switch ON.

2.

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

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

PCS-62, "DTC Logic"

.

Is the 1st trip DTC B2618 displayed again?

YES

>> Replace BCM. Refer to 

BCS-82, "Removal and Installation"

NO

>> INSPECTION END

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2618

BCM

An immediate operation of ignition relay (IPDM E/R) is re-
quested by BCM, but there is no response for more than 
1 second

BCM

2012 M

PCS

B261A PUSH-BUTTON IGNITION SWITCH

PCS-63

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

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B261A PUSH-BUTTON IGNITION SWITCH

DTC Logic

INFOID:0000000006887746

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. 

Is DTC detected?

YES

>> Go to 

PCS-63, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006887747

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

M50

4

Ground

12

BCM

Push-button ignition switch

Continuity

Connector

Terminal

Connector

Terminal

M123

100

M50

4

Existed

Push-button ignition switch

Ground

Continuity

Connector

Terminal

M50

4

Not existed

2012 M

PCS-64

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B261A PUSH-BUTTON IGNITION SWITCH

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-82, "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-44, "Intermittent Incident"

.

>> INSPECTION END

(+)

(–)

Voltage (V)

(Approx.)

IPDM E/R

Connector

Terminal

E5

30

Ground

12

IPDM E/R

Push-button ignition switch

Continuity

Connector

Terminal

Connector

Terminal

E5

30

M50

4

Existed

Push-button ignition switch

Ground

Continuity

Connector

Terminal

M50

4

Not existed

2012 M

PCS

B26F1 IGNITION RELAY

PCS-65

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

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B26F1 IGNITION RELAY

DTC Logic

INFOID:0000000006887748

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” with CONSULT. 

Is DTC detected?

YES

>> Go to 

PCS-65, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006887749

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-25, "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-82, "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

M123

98

Ground

Ignition switch

ON

0

BCM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

M123

98

E5

18

Existed

2012 M

PCS-66

< DTC/CIRCUIT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B26F1 IGNITION RELAY

NO

>> Repair or replace harness.

2012 M