Infiniti QX56 (JA60). Manual - part 435

EC-392

< COMPONENT DIAGNOSIS >

[VK56DE]

COOLING FAN

COOLING FAN

Diagnosis Procedure

INFOID:0000000005149469

1.

CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector E120.

3. Check voltage between IPDM E/R terminal 22 and ground with

CONSULT-III or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.

• 40 A fusible link (letter L)

• 25 A fusible link (letter N)

• Harness for open or short between IPDM E/R and battery

>> Repair open circuit or short to ground or short to power in harness or connectors.

3.

CHECK COOLING FAN MOTOR CIRCUIT FOR OPEN OR SHORT

1. Disconnect cooling fan motor harness connector (1).

2. Check harness continuity between cooling fan motor terminal 2

and IPDM E/R terminal 24, cooling fan motor terminal 1 and

ground.

Refer to wiring diagram.

3. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 4.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

4.

CHECK COOLING FAN MOTOR

Refer to 

EC-392, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace cooling fan motor.

5.

CHECK INTERMITTENT INCIDENT

Perform 

GI-35, "How to Check Terminal"

 and 

GI-38, "Intermittent Incident"

.

OK or NG

OK

>> Replace IPDM E/R. Refer to 

PCS-35, "Removal and Installation of IPDM E/R"

.

NG

>> Repair or replace harness connectors.

Component Inspection

INFOID:0000000005149470

COOLING FAN MOTOR

1. Disconnect cooling fan motor harness connector.

Voltage: Battery voltage

PBIB2067E

Continuity should exist.

BBIA0742E

COOLING FAN

EC-393

< COMPONENT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2. Supply cooling fan motor terminals with battery voltage and

check operation.

Cooling fan motor should operate.

If NG, replace cooling fan motor.

SEF888V

EC-394

< COMPONENT DIAGNOSIS >

[VK56DE]

ELECTRICAL LOAD SIGNAL

ELECTRICAL LOAD SIGNAL

Description

INFOID:0000000005149471

The electrical load signal (Headlamp switch signal, rear window defogger switch signal, etc.) is transferred

through the CAN communication line from BCM to ECM via IPDM E/R.

Diagnosis Procedure

INFOID:0000000005149472

1.

CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I

1. Turn ignition switch ON.

2. Connect CONSULT-III and select “DATA MONITOR” mode.

3. Select “LOAD SIGNAL” and check indication under the following conditions.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 4.

2.

CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II

Check “LOAD SIGNAL” indication under the following conditions.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 5.

3.

CHECK HEATER FAN SIGNAL CIRCUIT OVERALL FUNCTION

Select “HEATER FAN SW” and check indication under the following conditions.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

4.

CHECK REAR WINDOW DEFOGGER SYSTEM

Refer to 

DEF-4

.

>> INSPECTION END

5.

CHECK HEADLAMP SYSTEM

Refer to 

EXL-7

, or 

EXL-9

.

>> INSPECTION END

6.

CHECK HEATER FAN CONTROL SYSTEM

Refer to 

HAC-47

.

Condition

Indication

Rear window defogger switch: ON

ON

Rear window defogger switch: OFF

OFF

Condition

Indication

Lighting switch: ON at 2nd position

ON

Lighting switch: OFF

OFF

Condition

Indication

Heater fan control switch: ON

ON

Heater fan control switch: OFF

OFF

ELECTRICAL LOAD SIGNAL

EC-395

< COMPONENT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

>> INSPECTION END