Infiniti G37 Coupe. Manual - part 967

PCS

DIAGNOSIS AND REPAIR WORKFLOW

PCS-37

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

GET INFORMATION FOR SYMPTOM

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

>> GO TO 2.

CHECK DTC

Check DTC for BCM and IPDM E/R.

Perform the following procedure if DTC is displayed.

Record DTC and freeze frame data (Print them out with CONSULT-III.)

Erase DTC.

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

Check related service bulletins for information.

Is any symptom described and any DTC detected?

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

CONFIRM THE SYMPTOM

Confirm the symptom described by the customer.
Connect CONSULT-III to the vehicle in “DATA MONITOR” mode and check real time diagnosis results.
Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 5.

CONFIRM THE SYMPTOM

Confirm the symptom described by the customer.
Connect CONSULT-III to the vehicle in “DATA MONITOR ” mode and check real time diagnosis results.
Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 6.

PERFORM DTC CONFIRMATION PROCEDURE

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

SEC-181, "DTC Inspection Priority Chart"

, and determine trouble

diagnosis order.
NOTE:
Perform Component Function Check if DTC Confirmation Procedure is not included in 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 Confirmation
Procedure.
Is DTC detected?

YES

>> GO TO 7.

>> Refer to

GI-38, "Intermittent Incident"

DETECT MALFUNCTIONING SYSTEM BY SYMPTOM TABLE

Detect malfunctioning system according to

PCS-125, "Symptom Table"

based on the confirmed symptom in

step 4, and determine the trouble diagnosis order based on possible causes and symptom.

>> GO TO 7.

DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE

Inspect according to Diagnostic Procedure of the system.
NOTE:
The Diagnostic Procedure described based on open circuit inspection. A short circuit inspection is also
required for the circuit check in the Diagnostic Procedure.

PCS-38

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

DIAGNOSIS AND REPAIR WORKFLOW

Is malfunctioning part detected?

YES

>> GO TO 8.

>> Check voltage of related BCM terminals using CONSULT-III.

REPAIR OR REPLACE THE MALFUNCTIONING PART

Repair or replace the malfunctioning part.

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

Check DTC. If DTC is displayed, erase it.

>> GO TO 9.

FINAL CHECK

When DTC was detected in step 2, perform DTC Confirmation Procedure or Component Function Check
again, and then check that the malfunction has been repaired securely.
When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and check that
the symptom is not detected.

Does the symptom reappear?

YES (DTC is detected)>>GO TO 7.
YES (Symptom remains)>>GO TO 6.
NO

>> INSPECTION END

PCS

POWER DISTRIBUTION SYSTEM

PCS-39

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

FUNCTION DIAGNOSIS

POWER DISTRIBUTION SYSTEM

System Description

INFOID:0000000001675256

INPUT/OUTPUT SIGNAL CHART

SYSTEM DESCRIPTION

• PDS (POWER DISTRIBUTION SYSTEM) is the system that BCM controls with the operation of the push-

button ignition switch and performs the power distribution to each power circuit. This system is used instead
of the mechanical power supply changing mechanism with the operation of the conventional key cylinder.

• The push-button ignition switch can be operated when Intelligent Key is in the following condition. Refer to

Engine Start Function for details.

- Intelligent Key is in the detection area of the interior antenna
- Insert Intelligent Key in to the key slot
• The push-button ignition switch operation is input to BCM as a signal. BCM changes the power supply posi-

tion according to the status and operates the following relays to supply power to each power circuit.

- Ignition relay (inside IPDM E/R)
- Ignition relay (inside fuse block)
- ACC relay
- Blower fan relay

NOTE:
The engine switch operation changes due to the conditions of brake pedal, A/T selector lever and vehicle
speed.

• The power supply position can be confirmed with the lighting of the indicators near the push-button ignition

switch.

BATTERY SAVER SYSTEM

When all the following conditions are met for 60 minutes, the battery saver system will cut off the power supply
to prevent battery discharge.
• The ignition switch is in the ACC position
• All doors are closed
• A/T selector lever is in the P position

Reset Condition of Battery Saver System

A/T models
In order to prevent the battery from discharging, the battery saver system will cut off the power supply when all
doors are closed, the selector lever is on P position and the ignition switch is left on ACC position for 1 hour. If
any of the following conditions are met the battery saver system is released and the steering will change auto-
matically to lock position from OFF position.
• Opening any door
• Operating with request switch on door lock
• Operating with Intelligent Key on door lock
Press push-button ignition switch and ignition switch will change to ACC position from OFF position.
M/T models
If any of the conditions above is met the battery saver system is released but the steering will not lock.
In this case, the steering operation OFF to LOCK is prohibited.

STEERING LOCK OPERATION

Steering is locked by steering lock unit when ignition switch is in the OFF position, A/T selector lever is in the
P position and any of the following conditions are met.
• Opening door

Switch

Input Signal to BCM

BCM system

Actuator

Push-button ignition switch

Push switch

Power destribution system

• Ignition relay (IPDM E/R)
• Ignition relay (fuse block)
• ACC relay
• Blower relay

AT device (A/T models)

P range

PNP switch (A/T models)

N, P range

Stop lamp switch (A/T models)

Brake ON/OFF

Clutch interlock switch (M/T models)

Clutch ON/OFF

PCS-40

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

POWER DISTRIBUTION SYSTEM

• Closing door
• Door is locked with request switch
• Door is locked with Intelligent Key

PUSH-BUTTON IGNITION SWITCH OPERATION PROCEDURE

The power supply position changing operation can be performed with the following operations.
NOTE:
• When an Intelligent Key is within the detection area of inside key antenna and when it is inserted to the key

slot, it is equivalent to the operations below.

• When starting the engine, the BCM monitors under the engine start conditions,

A/T models

- Brake pedal operating condition
- A/T selector lever position
- Vehicle speed

M/T models

- Clutch pedal operating condition
- Vehicle speed
• Unless each start condition is fulfilled, the engine will not respond regardless of how many times the engine

switch is pressed. At that time, illumination repeats the position in the order of LOCK

→

ACC

→

OFF.

*1: When the A/T selector lever position is N position, the engine start condition is different according to the vehicle speed.

• At vehicle speed of less than 4 km/h (2.5MPH), the engine can start only when the brake pedal is depressed.

• At vehicle speed of 4 km/h (2.5MPH) or more, the engine can start even if the brake pedal is not depressed. (It is the same as “Engine

stall return operation while driving”.)

*2: When the A/T selector lever position is in any position other than P position and when the vehicle speed is 5 km/h (3.1MPH) or more,
the engine stop condition is different.

• Press and hold the push-button ignition switch for 2 seconds or more. (When the push-button ignition switch is pressed for too short a

time, the operation may be invalid, so properly press and hold to prevent an incorrect operation.)

• Press the push-button ignition switch 3 times or more within 1.5 seconds. (Emergency stop operation)

Power supply position

Engine start/stop condition

Push-button ignition switch op-

eration frequency

•Brake pedal (A/T models)

•Clutch pedal (M/T models)

A/T selector lever position (A/T

models)

LOCK

→

ACC

Not depressed

Any position

LOCK

→

ACC

→

Not depressed

Any position

LOCK

→

ACC

→

OFF

Not depressed

Any position

LOCK

→

START

ACC

→

START

→

START

(Engine start)

Depressed

P or N position (*1)

[If the switch is pressed once,

the engine starts from any pow-
er supply position (LOCK, ACC,

and ON)]

Engine is running

→

OFF
(Engine stop)

—

Any position

Engine is running

→

ACC
(Engine stop)

—

Any position other than P (*2)

Engine stall return oper-
ation while driving

—

N position

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