Nissan Maxima. Manual - part 1075

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

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< ECU DIAGNOSIS INFORMATION >

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Fail Safe

INFOID:0000000010068753

CAN COMMUNICATION CONTROL

When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN

communication recovers normally, it also returns to normal control.

If No CAN Communication Is Available With ECM

If No CAN Communication Is Available With BCM

88

(R/W)

Ground

Washer pump power sup-
ply

Output

Ignition switch ON

Battery voltage

89

(L/W)

Ground Headlamp HI (RH)

Output

Ignition 
switch ON

• Lighting switch HI
• Lighting switch PASS

Battery voltage

Lighting switch OFF

0 V

90

(G)

Ground Headlamp HI (LH)

Output

Ignition 
switch ON

• Lighting switch HI
• Lighting switch PASS

Battery voltage

Lighting switch OFF

0 V

91

(LG/

R)

Ground

Parking lamp (RH)

Output

Ignition 
switch ON

Lighting switch 1ST

Battery voltage

Side marker lamp (RH)

Lighting switch OFF

0 V

92

(LG/

B)

Ground

Parking lamp (LH)

Output

Ignition 
switch ON

Lighting switch 1ST

Battery voltage

Side marker lamp (LH)

Lighting switch OFF

0 V

99

(BR/

W)

Ground Ambient sensor ground

—

Ignition switch ON

0V

100

(SB)

Ground Ambient sensor

—

Ignition switch ON

5V

101

(W)

Ground

Refrigerant pressure sen-
sor ground

—

Ignition switch ON

0V

102

(R)

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

103

(P)

Ground

Refrigerant pressure sen-
sor power supply

—

Ignition switch ON

5V

105

(V)

Ground

Daytime light relay control 
(Only for Canada models)

Output

Ignition 
switch ON

Daytime light system ac-
tive

Battery voltage

Ignition 
switch ON

Daytime light system inac-
tive

0 V

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

Signal name

Input/ 

Output

+

−

Control part

Fail-safe in operation

Cooling fan

• Signals cooling fans ON when the ignition switch is turned ON
• Signals cooling fans OFF when the ignition switch is turned OFF

A/C compressor

A/C relay OFF

Generator

Outputs the power generation command signal (PWM signal) 0%

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< ECU DIAGNOSIS INFORMATION >

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

IGNITION RELAY MALFUNCTION DETECTION FUNCTION

• IPDM E/R monitors the voltage at the contact circuit and excitation coil circuit of the ignition relay-1 inside it. 

• IPDM E/R judges the ignition relay-1 error if the voltage differs between the contact circuit and the excitation

coil circuit.

• If the ignition relay-1 cannot turn OFF due to contact seizure, it activates the tail lamp relay for 10 minutes to

alert the user to the ignition relay-1 malfunction when the ignition switch is turned OFF.

NOTE:
The tail lamp turns OFF when the ignition switch is turned ON.

FRONT WIPER CONTROL

IPDM E/R detects front wiper stop position by a front wiper auto stop signal.

When a front wiper auto stop signal is in the conditions listed below, IPDM E/R stops power supply to wiper

after repeating a front wiper 10 seconds activation and 20 seconds stop five times.

NOTE:

This operation status can be confirmed on the IPDM E/R “Data Monitor” that displays “BLOCK” for the item

“WIP PROT” while the wiper is stopped.

STARTER MOTOR PROTECTION FUNCTION

IPDM E/R turns OFF the starter control relay to protect the starter motor when the starter control relay remains

active for 90 seconds.

Control part

Fail-safe in operation

Headlamp

• Turns ON the headlamp low relay when the ignition switch is turned ON
• Turns OFF the headlamp low relay when the ignition switch is turned OFF
• Headlamp high relay OFF

• Parking  lamps
• Side marker lamps
• License plate lamps
• Illumination
• Tail lamps

• Turns ON the tail lamp relay when the ignition switch is turned ON
• Turns OFF the tail lamp relay when the ignition switch is turned OFF

Front wiper

• The status just before activation of fail-safe control is maintained until the ignition 

switch is turned OFF while the front wiper is operating at LO or HI speed.

• The wiper is operated at LO speed until the ignition switch is turned OFF if the fail-

safe control is activated while the front wiper is set in the INT mode and the front wiper 
motor is operating.

Front fog lamps (if equipped)

Front fog lamp relay OFF

Horn

Horn OFF

Ignition relay

The status just before activation of fail-safe is maintained.

Starter motor

Starter control relay OFF

DTC

Ignition switch

Ignition relay-1

Tail lamp relay

—

ON

ON

—

—

OFF

OFF

—

B2098: IGN RELAY ON

OFF

ON

ON (10 minutes)

B2099: IGN RELAY OFF

ON

OFF

—

Ignition switch

Front wiper switch

Auto stop signal

ON

OFF

Front wiper stop position signal cannot be 
input 10 seconds.

ON

The signal does not change for 10 seconds.

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

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DTC Index

INFOID:0000000010068754

NOTE:

The details of TIME display are as follows.

• CRNT: The malfunctions that are detected now

• 1 - 39: The number is indicated when it is normal at present and a malfunction was detected in the past. It

increases like 0 

→ 1 → 2 ··· 38 → 39 after returning to the normal condition whenever IGN OFF → ON. It is

fixed to 39 until the self-diagnosis results are erased if it is over 39. It returns to 0 when a malfunction is

detected again in the process.

CONSULT display

Fail-safe

TIME

NOTE

Refer to

No DTC is detected.
further testing
may be required.

—

—

—

—

U1000: CAN COMM CIRCUIT

×

CRNT

1 – 39

PCS-15

B2098: IGN RELAY ON

×

CRNT

1 – 39

PCS-16

B2099: IGN RELAY OFF

—

CRNT

1 – 39

PCS-17

B210B: START CONT RLY ON

—

CRNT

1 – 39

SEC-69

B210C: START CONT RLY OFF

—

CRNT

1 – 39

SEC-72

B210D: STARTER RELAY ON

—

CRNT

1 – 39

SEC-72

B210E: STARTER RELAY OFF

—

CRNT

1 – 39

SEC-74

B210F: INTRLCK/PNP SW ON

—

CRNT

1 – 39

SEC-76

B2110: INTRLCK/PNP SW OFF

—

CRNT

1 – 39

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< WIRING DIAGRAM >

NVIS

WIRING DIAGRAM

NVIS

Wiring Diagram

INFOID:0000000010052038

ABKWA1179GB