Nissan Maxima. Manual - part 866

MWI

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

MWI-79

< ECU DIAGNOSIS INFORMATION >

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

TERMINAL LAYOUT

PHYSICAL VALUES

ST/INHI RLY

Ignition switch ON

Off

At engine cranking

ST 

→INHI 

The status of starter relay or starter control relay cannot be recognized by 
the battery voltage malfunction, etc. when the starter relay is ON and the 
starter control relay is OFF

UNKWN

DETENT SW

Ignition switch ON

• Press the selector button with 

CVT selector lever in P position

• CVT selector lever in any posi-

tion other than P

Off

Release the CVT selector button with CVT selector lever in P position

On

DTRL -REQ

DTRL ON

On

DTRL OFF

Off

OIL P SW

Ignition switch OFF, ACC or engine running

Open

Ignition switch ON

Close

THFT HRN REQ

Not operated

Off

• Panic alarm is activated
• Horn is activated with VEHICLE SECURITY (THEFT WARNING) SYS-

TEM

On

HORN CHIRP

Not operated

Off

Door locking with Intelligent Key (horn chirp mode)

On

Monitor Item

Condition

Value/Status

ALMIA0128ZZ

MWI-80

< ECU DIAGNOSIS INFORMATION >

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

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

Signal name

Input/ 

Output

+

−

1

(R)

Ground Battery power supply

Input

Ignition switch OFF

Battery voltage

2

(L)

Ground Battery power supply

Input

Ignition switch OFF

Battery voltage

4

(LG)

Ground Front wiper LO

Output

Ignition 
switch ON

Front wiper switch OFF

0 V

Front wiper switch LO

Battery voltage

5

(Y)

Ground Front wiper HI

Output

Ignition 
switch ON

Front wiper switch OFF

0 V

Front wiper switch HI

Battery voltage

6

(L)

Ground

Daytime light relay power 
supply (Canada models 
only)

Output

Ignition switch OFF

Battery voltage

7

(GR)

Ground

Tail, license plate lamps & 
interior lamps

Output

Ignition 
switch ON

Lighting switch OFF

0 V

Lighting switch 1ST

Battery voltage

10

(BR)

Ground ECM relay power supply

Output

Ignition switch OFF
(For a few seconds after turning ignition 
switch OFF)

0 V

• Ignition switch ON
• Ignition switch OFF

(More than a few seconds after turn-
ing ignition switch OFF)

Battery voltage

12

(B)

Ground Ground

—

Ignition switch ON

0 V

13

(SB)

Ground Fuel pump power supply 

Output

Approximately 1 second or more after 
turning the ignition switch ON

0 V

• Approximately 1 second after turning 

the ignition switch ON

• Engine running

Battery voltage

15

(W)

Ground

Ignition relay-1 power sup-
ply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

16

(R)

Ground Front wiper auto stop

Input

Ignition 
switch ON

Front wiper stop position

0 V

Any position other than 
front wiper stop position

Battery voltage

19

(Y)

Ground

Ignition relay-1 power sup-
ply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

20

(L)

Ground Ambient sensor ground

—

Ignition switch ON

0V

21

(LG)

Ground Ambient sensor

—

Ignition switch ON

5V

22

(SB)

Ground

Refrigerant pressure sen-
sor ground

—

Ignition switch ON

0V

23

(GR)

Ground

Refrigerant pressure sen-
sor

—

• Ignition switch ON (READY)
• Both A/C switch and blower motor 

switch ON (electric compressor oper-
ates)

1.0 - 4.0V

24

(G)

Ground

Refrigerant pressure sen-
sor power supply

—

Ignition switch ON

5V

25

(GR)

Ground

Ignition relay-1 power sup-
ply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

MWI

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

MWI-81

< ECU DIAGNOSIS INFORMATION >

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

27

(W)

Ground Ignition relay monitor

Input

Ignition switch OFF or ACC

Battery voltage

Ignition switch ON

0 V

28

(SB)

Ground

Push-button ignition 
switch

Input

Press the push-button ignition switch

0 V

Release the push-button ignition switch Battery voltage

30

(BR)

Ground Starter relay control 

Input

CVT selector lever in any position other 
than P or N (ignition switch ON)

0 V

CVT selector lever P or N (ignition 
switch ON)

Battery voltage

34

(O)

Ground Cooling fan relay-3 control

Input

Ignition switch OFF or ACC

0 V

Ignition switch ON

0.7 V

35

(P)

Ground Cooling fan motor control

Output

Ignition switch OFF or ACC

0 V

Ignition switch ON

0.7 V

36

(G)

Ground Battery power supply

Input

Ignition switch OFF

Battery voltage

38

(GR)

Ground Cooling fan motor control

Output

Ignition switch OFF or ACC

0 V

Ignition switch ON

0.7 V

39

(P)

—

CAN  -  L

Input/ 

Output

—

—

40

(L)

—

CAN  -  H

Input/ 

Output

—

—

41

(B)

Ground Ground

—

Ignition switch ON

0 V

42

(SB)

Ground Cooling fan relay-2 control

Input

Ignition switch OFF or ACC

0 V

Ignition switch ON

0.7 V

43

(Y)

Ground

CVT shift selector
(Detention switch)

Input

Ignition 
switch ON

Press the CVT selector 
button (CVT selector lever 
P)

Battery voltage

• CVT selector lever in 

any position other than 
P

• Release the CVT selec-

tor button (CVT selector 
lever P)

0 V

44

(W)

Ground Horn relay control

Input

The horn is deactivated

Battery voltage

The horn is activated

0 V

45

(GR)

Ground Anti theft horn relay control

Input

The horn is deactivated

Battery voltage

The horn is activated

0 V

46

(BR)

Ground Starter relay control 

Input

CVT selector lever in any position other 
than P or N (ignition switch ON)

0 V

CVT selector lever P or N (ignition 
switch ON)

Battery voltage

48

(W)

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

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

Signal name

Input/ 

Output

+

−

MWI-82

< ECU DIAGNOSIS INFORMATION >

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

49

(R/B)

Ground ECM relay power supply

Output

Ignition switch OFF
(For a few seconds after turning ignition 
switch OFF)

0 V

• Ignition switch ON
• Ignition switch OFF

(More than a few seconds after turn-
ing ignition switch OFF)

Battery voltage

51

(LG)

Ground Ignition relay power supply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

52

(Y/G)

Ground Ignition relay power supply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

53

(R/W)

Ground ECM relay power supply

Output

Ignition switch OFF
(For a few seconds after turning ignition 
switch OFF)

0 V

• Ignition switch ON
• Ignition switch OFF

(More than a few seconds after turn-
ing ignition switch OFF)

Battery voltage

54

(G/W)

Ground

Throttle control motor re-
lay power supply

Output

Ignition switch OFF
(For a few seconds after turning ignition 
switch OFF)

0 V

• Ignition switch ON
• Ignition switch OFF

(More than a few seconds after turn-
ing ignition switch OFF)

Battery voltage

55

(W/L)

Ground ECM power supply

Output

Ignition switch OFF

Battery voltage

56

(R/Y)

Ground Ignition relay power supply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

57

(O)

Ground Ignition relay power supply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

58

(Y)

Ground Ignition relay power supply

Output

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

69

(W/B)

Ground ECM relay control

Output

Ignition switch OFF
(For a few seconds after turning ignition 
switch OFF)

Battery voltage

• Ignition switch ON
• Ignition switch OFF

(More than a few seconds after turn-
ing ignition switch OFF)

0 - 1.5 V

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

72

(R/B)

Ground

Transmission range switch 
signal

Input

Ignition 
switch ON

CVT selector lever in P or 
N position

Battery voltage

CVT selector lever in any 
position other than P or N 
position

0 V

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

Signal name

Input/ 

Output

+

−