Infiniti QX56 (JA60). Manual - part 1048

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< ECU DIAGNOSIS >

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

Fail Safe

INFOID:0000000005369227

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

ABMIA1043GB

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

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If No CAN Communication Is Available With BCM

IGNITION RELAY MALFUNCTION DETECTION FUNCTION

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

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

coil circuit.

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

alert the user to the ignition relay 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 second activation and 20 second 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

Cooling fan

• Turns ON the cooling fan relay when the ignition switch is turned ON
• Turns OFF the cooling fan relay when the ignition switch is turned OFF

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 LH/RH relays OFF

• Parking  lamps
• License plate lamps
• 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.

Rear window defogger

Rear window defogger relay OFF

A/C compressor

A/C relay OFF

Front fog lamps

Front fog lamp relay OFF

Ignition switch

Ignition relay

Tail lamp relay

ON

ON

—

OFF

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.

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

DTC Index

INFOID:0000000005369228

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-III display

Fail-safe

TIME

NOTE

Refer to

No DTC is detected.
further testing
may be required.

—

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U1000: CAN COMM CIRCUIT

×

CRNT

1 – 39

PCS-17

WIPER AND WASHER SYSTEM SYMPTOMS

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SYMPTOM DIAGNOSIS

WIPER AND WASHER SYSTEM SYMPTOMS

Symptom Table

INFOID:0000000005146796

CAUTION:

Perform the self-diagnosis with CONSULT-III before performing the diagnosis by symptom. Perform

the diagnosis by DTC if DTC is detected.

Symptom

Probable malfunction location

Inspection item

Front wiper does not 
operate.

HI only

• Combination switch
• Harness between combination switch and BCM
• BCM

Combination switch 
Refer to 

BCS-56, "Symptom 

Table"

.

• IPDM E/R
• Harness between IPDM E/R and front wiper 

motor

• Front wiper motor

Front wiper motor (HI) circuit
Refer to 

WW-21, "Compo-

nent Function Check"

.

Front wiper request signal
• BCM
• IPDM E/R

IPDM E/R DATA MONITOR
"FR WIP REQ"

LO and INT

• Combination switch
• Harness between combination switch and BCM
• BCM

Combination switch
Refer to 

BCS-56, "Symptom 

Table"

.

• IPDM E/R
• Harness between IPDM E/R and front wiper 

motor

• Front wiper motor

Front wiper motor (LO) circuit
Refer to 

WW-19, "Compo-

nent Function Check"

.

Front wiper request signal
• BCM
• IPDM E/R

IPDM E/R DATA MONITOR
"FR WIP REQ"

INT only

• Combination switch
• Harness between combination switch and BCM
• BCM

Combination switch
Refer to 

BCS-56, "Symptom 

Table"

.

Front wiper request signal
• BCM
• IPDM E/R

IPDM E/R DATA MONITOR
"FR WIP REQ"

HI, LO, and INT

SYMPTOM DIAGNOSIS
“FRONT WIPER DOES NOT OPERATE”
Refer to 

WW-75, "Diagnosis Procedure"

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