Infiniti M35/M45 Y50. Manual - part 973

PDU (POWER DISTRIBUTION UNIT)

PG-37

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Terminals and Reference Value for PDU

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Work Flow

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1.

Check the symptom and customer's requests.

2.

Understand outline of system. Refer to 

PG-32, "System Description"

 .

3.

Confirm that Intelligent Key system operates normally.
Refer to 

BL-24, "POWER DOOR LOCK SYSTEM"

 .

4.

Repair or replace any malfunctioning parts.
Refer to 

PG-38, "Trouble Diagnosis Symptom Chart"

 .

5.

INSPECTION END

57

L

Power source (Fuse)

Input

LOCK

—

Battery voltage

72

B

Ground

—

—

—

0

Termi-

nal

Wire 

Color

Item

Signal 

Input/

Output

Condition

Voltage (V)

Approx.

Ignition 

Switch 

Position

Operation or Conditions

Termi-

nal

Wire 

Color

Item

Signal 

Input/

Output

Condition

Voltage (V)

Approx.

Ignition 

Switch 

Position

Operation or Conditions

1

P

PDU wake up signal

Output

LOCK

Push-button ignition switch is in LOCK 
state, 30 seconds after all doors close

Battery voltage

Other than above

0

4

BR

Ignition signal 1

Output

LOCK

—

Battery voltage

ACC

—

Battery voltage

ON

—

0

5

W

Ignition signal 2

Output

LOCK

—

Battery voltage

ACC

—

Battery voltage

ON

—

0

8

SB

ACC signal

Output

LOCK

—

Battery voltage

ACC

—

0

ON

—

0

10

B

Ground

—

—

—

0

11

Y

IPDM E/R status signal

Input

—

Engine starting (During Cranking)

5

Other than above

2

12

R

PDU feedback signal

Input

LOCK

Push-button ignition switch is in LOCK 
state, 30 seconds after all doors close

1

Other than above

0

14

SB

Power source (Fuse)

Input

LOCK

—

Battery voltage

15

L

Power source (F/L)

Input

LOCK

—

Battery voltage

16

W

ACC power output

Output

LOCK

—

0

ACC

—

Battery voltage

ON

—

Battery voltage

17

G

Power source (Fuse)

Input

LOCK

—

Battery voltage

18

BR

ON power output

Output

LOCK

—

0

ACC

—

0

ON

—

Battery voltage

PG-38

PDU (POWER DISTRIBUTION UNIT)

Trouble Diagnosis Symptom Chart

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Before performing the diagnosis in the following table, check the contents of 

PG-37, "Work Flow"

 .

Check CAN Communication System

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1. 

CHECK SELF-DIAGNOSTIC RESULTS

CAUTION:

If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which performs CAN communication.

 With CONSULT-II

●

Connect CONSULT-II, and turn ignition switch ON.

●

Touch “INTELLIGENT KEY” on “SELECT SYSTEM” screen.

●

Touch “SELF-DIAG RESULTS” on “SELECT DIAG MODE” screen.

●

Check display content in self-diagnostic results.

OK or NG

NO DTC IS DETECTED>> INSPECTION END
CAN COMM CIRCUIT [U1000]>> After printing “SELF-DIAGNOSIS RESULTS”, go to “CAN SYSTEM”,

Refer to 

LAN-42, "Precautions When Using CONSULT-II"

 .

CONTROL UNIT (CAN) [U1010]>> Replace Intelligent Key unit.

Symptom

Suspect Systems

Refer to

Even if the push-button ignition switch is pressed, the 
power supply position and the push-button ignition switch 
position indicator does not response.

1. Check push-button ignition switch (ignition switch) 
system

PG-39

2. Replace Intelligent Key unit

BL-123

The push-button ignition switch position indicator turns 
on synchronizing with the push-button ignition switch 
operation. But the actual power supply is not input.

1. Check PDU power supply and ground circuit system

PG-39

2. Check PDU communication circuit system 1

PG-42

3. Replace PDU

PG-44

The push-button ignition switch position indicator turns 
on synchronizing with the push-button ignition switch 
operation. But the actual ON power supply is not input. 
(ACC power supply input is normal.)

1. Check PDU communication circuit system 2

PG-43

2. Replace PDU

PG-44

The power supply changing operation is normal. But the 
push-button ignition switch position indicator does not 
turn on.

1. Check push-button ignition switch (indicator circuit) 
system

PG-41

2. Replace Intelligent Key unit

BL-123

CONSULT-II display item

DTC code

NO DTC IS DETECTED

—

CAN COMM CIRCUIT

U1000

CONTROL UNIT (CAN)

U1010

PDU (POWER DISTRIBUTION UNIT)

PG-39

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Check PDU Power Supply and Ground Circuit

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1. 

CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect PDU connector.

3.

Check voltage between PDU harness connector and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace PDU power supply circuit.

2. 

CHECK GROUND CIRCUIT

Check continuity between PDU harness connector and ground.

OK or NG

OK

>> Power supply and ground circuits are OK.

NG

>> Repair or replace the PDU ground circuit.

Check Push-Button Ignition Switch (Ignition Switch) System

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1. 

CHECK PUSH-BUTTON IGNITION SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect Intelligent Key unit connector.

3.

Check continuity between Intelligent Key unit harness connector
and ground.

OK or NG

OK

>> Push-button ignition switch system is OK.

NG

>> GO TO 2.

PDU connector

Terminal

Voltage (V)

(Approx.)

(+)

(-)

M31

14

Ground

Battery voltage

15

17

PIIB6115E

PDU connector

Terminal

Continuity

M30

10

Ground

Yes

PIIB6116E

Intelligent 

Key unit 

connector

Terminal

Condition

Continuity

M32

39

Ground

Push-button ignition 

switch is pressed

Yes

Push-button ignition 

switch is released

No

PIIB6117E

PG-40

PDU (POWER DISTRIBUTION UNIT)

2. 

CHECK PUSH-BUTTON IGNITION SWITCH OPERATION

1.

Turn ignition switch OFF.

2.

Check continuity push-button ignition switch connector.

OK or NG

OK

>> GO TO 3.

NG

>> Replace push-button ignition switch.

3. 

CHECK PUSH-BUTTON IGNITION SWITCH GROUND CIRCUIT SYSTEM

Check continuity between push-button ignition switch harness con-
nector and ground.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace push-button ignition switch ground cir-

cuit.

4. 

CHECK PUSH-BUTTON IGNITION SWITCH CIRCUIT

1.

Disconnect Intelligent Key unit connector.

2.

Check continuity between Intelligent Key unit harness connector and push-button switch harness connec-
tor.

3.

Check continuity between push-button ignition switch harness
connector and ground.

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace harness between Intelligent Key unit and ignition switch.

Push-button 

ignition 

switch con-

nector

Terminal

Condition

Continuity

M27

1

4

Push-button ignition 

switch is pressed

Yes

Push-button ignition 

switch is released

No

PIIB6118E

Push-button ignition 

switch connector

Terminal

Continuity

M27

1

Ground part of 

push-button 

ignition switch

Yes

PIIB6120E

A

B

Continuity 

Push-button 

ignition switch 

connector

Terminal

Intelligent Key 
unit connector

Terminal

M27

4

M32

39

Yes

Push-button ignition 

switch connector

Terminal

Continuity

M27

4

Ground

No

PIIB6119E