Infiniti G37 Coupe. Manual - part 1173

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

SEC-189

< ECU DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

45

(G)

Ground

Anti theft horn relay control

Input

The horn is deactivated

Battery voltage

The horn is activated

0 V

46

(P)

Ground

Starter relay control 

Input

A/T mod-
els

A/T selector lever in any 
position other than P or N 
(Ignition switch ON)

0 V

A/T selector lever P or N 
(Ignition switch ON)

Battery voltage

M/T mod-
els

Release the clutch pedal

0 V

Depress the clutch pedal

Battery voltage

48

(BR)

Ground

A/C relay power supply

Output

Engine 
running

A/C switch OFF

0 V

A/C switch ON
(A/C compressor is oper-
ating)

Battery voltage

49

(O)

Ground

ECM relay power supply

Output

Ignition switch OFF
(More than a few seconds after turning 
ignition switch OFF)

0 V

• Ignition switch ON
• Ignition switch OFF

(For a few seconds after turning igni-
tion switch OFF)

Battery voltage

51

(Y)

Ground

Ignition relay power supply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

53

(W)

Ground

ECM relay power supply

Output

Ignition switch OFF
(More than a few seconds after turning 
ignition switch OFF)

0 V

• Ignition switch ON
• Ignition switch OFF

(For a few seconds after turning igni-
tion switch OFF)

Battery voltage

54

(P)

Ground

Throttle control motor re-
lay power supply

Output

Ignition switch OFF
(More than a few seconds after turning 
ignition switch OFF)

0 V

• Ignition switch ON
• Ignition switch OFF

(For a few seconds after turning igni-
tion switch OFF)

Battery voltage

55

(SB)

Ground

ECM power supply

Output

Ignition switch OFF

Battery voltage

56

(LG)

Ground

Ignition relay power supply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

57

(G)

Ground

Ignition relay power supply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

58*

2

(L)

Ground

Ignition relay power supply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

69

(BR)

Ground

ECM relay control

Output

Ignition switch OFF
(More than a few seconds after turning 
ignition switch OFF)

Battery voltage

• Ignition switch ON
• Ignition switch OFF

(For a few seconds after turning igni-
tion switch OFF)

0 - 1.5 V

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

Signal name

Input/ 

Output

+

−

SEC-190

< ECU DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

70

(O)

Ground

Throttle control motor re-
lay control

Output

Ignition switch ON 

→

 OFF

0 -1.0 V 

↓

Battery voltage

↓

0 V

Ignition switch ON

0 - 1.0 V

73*

3

(P)

Ground

Ignition relay power supply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

74

(G)

Ground

Ignition relay power supply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

75

(SB)

Ground

Oil pressure switch

Input

Ignition 
switch ON

Engine stopped

0 V

Engine running

Battery voltage

76

(Y)

Ground

Power generation com-
mand signal

Output

Ignition switch ON

6.3 V

40% is set on “ACTIVE TEST”, “AL-
TERNATOR DUTY” of “ENGINE”

3.8 V

80% is set on “ACTIVE TEST”, “AL-
TERNATOR DUTY” of “ENGINE”

1.4 V

77

(R)

Ground

Fuel pump relay control

Output

• Approximately 1 second after turning 

the ignition switch ON

• Engine running

0 - 1.0 V

Approximately 1 second or more after 
turning the ignition switch ON

Battery voltage

80

(W)

Ground

Starter motor 

Output

At engine cranking

Battery voltage

83

(R)

Ground

Headlamp LO (RH)

Output

Ignition 
switch ON

Lighting switch OFF

0 V

Lighting switch 2ND

Battery voltage

84

(P)

Ground

Headlamp LO (LH)

Output

Ignition 
switch ON

Lighting switch OFF

0 V

Lighting switch 2ND

Battery voltage

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

Signal name

Input/ 

Output

+

−

JPMIA0001GB

JPMIA0002GB

JPMIA0003GB

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

SEC-191

< ECU DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

*

1

: Only for the models with ICC system

*

2

: A/T models only

*

3

: M/T models only

86

(W)

Ground

Front fog lamp (RH)

Output

Lighting 
switch 
2ND

• Front fog lamp switch 

ON

• Daytime running light 

activated (Only for Can-
ada)

Battery voltage

Front fog lamp switch OFF

0 V

87

(L)

Ground

Front fog lamp (LH)

Output

Lighting 
switch 
2ND

• Front fog lamp switch 

ON

• Daytime running light 

activated (Only for Can-
ada)

Battery voltage

Front fog lamp switch OFF

0 V

88

(G)

Ground

Washer pump power sup-
ply

Output

Ignition switch ON

Battery voltage

89

(BR)

Ground

Headlamp HI (RH)

Output

Ignition 
switch ON

• Lighting switch HI
• Lighting switch PASS

Battery voltage

Lighting switch OFF

0 V

90

(LG)

Ground

Headlamp HI (LH)

Output

Ignition 
switch ON

• Lighting switch HI
• Lighting switch PASS

Battery voltage

Lighting switch OFF

0 V

91

(P)

Ground

Parking lamp (RH)

Output

Ignition 
switch ON

Lighting switch 1ST

Battery voltage

Lighting switch OFF

0 V

92

(O)

Ground

Parking lamp (LH)

Output

Ignition 
switch ON

Lighting switch 1ST

Battery voltage

Lighting switch OFF

0 V

97

(V)

Ground

Cooling fan control

Output

Engine idling

0 - 5 V

104

(LG)

Ground

Hood switch 

Input

Close the hood

Battery voltage

Open the hood

0 V

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

Signal name

Input/ 

Output

+

−

SEC-192

< ECU DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

Wiring Diagram - INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION -

INFOID:0000000001837870

JCKWA0632GB