Infiniti QX56 (Z62). Manual - part 1253

ST-22

< DTC/CIRCUIT DIAGNOSIS >

HEATED STEERING WHEEL SWITCH INDICATOR LAMP

7.

DETECT MALFUNCTIONING ITEM

Check the following.
• Ignition switch
• Harness for short or open between ignition switch and fuse block (J/B). Refer to 

PG-11, "Wiring Diagram -

BATTERY POWER SUPPLY -"

.

• 10A fuse [No.3, located in the fuse block (J/B)]. Refer to 

PG-143, "Fuse, Connector and Terminal Arrange-

ment"

.

• Fuse block (J/B)
Is the inspection result normal?

YES

>> Replace heated steering wheel switch. Refer to 

ST-56, "Removal and Installation"

.

NO

>> Repair or replace damaged parts.

Component Inspection (Heated Steering Wheel Relay)

INFOID:0000000006225591

1.

CHECK HEATED STEERING WHEEL RELAY CONTINUITY

Check continuity between heated steering wheel relay terminals.

CAUTION:

Connect the fuse between the terminals when applying the voltage.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace heated steering wheel relay. Refer to 

ST-7, "Component Parts Location (Heated Steering

Wheel)"

.

Heated steering wheel relay

Condition

Continuity

Terminal

3 

−

 5

Apply 12 V direct current be-
tween terminals 1 and 2. 

Existed

Other conditions.

Not existed

HEATED STEERING WHEEL SYSTEM DOES NOT ACTIVATE

ST-23

< SYMPTOM DIAGNOSIS >

C

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SYMPTOM DIAGNOSIS

HEATED STEERING WHEEL SYSTEM DOES NOT ACTIVATE

Description 

INFOID:0000000006225592

• The heated steering wheel does not warm up.
• The heated steering wheel system cannot be turned OFF.

Diagnosis Procedure

INFOID:0000000006225593

1.

CHECK POWER SOURCE AND GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Remove the heated steering wheel. Refer to 

ST-33, "Removal and Installation"

.

3.

Turn ignition switch ON.

CAUTION:

Never start the engine.

4.

Turn heated steering wheel switch ON.

5.

Check voltage between heated steering wheel harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK HEATED STEERING WHEEL

Check heated steering wheel. Refer to 

ST-18, "Component Inspection (Heated Steering Wheel)"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace heated steering wheel. Refer to 

ST-33, "Removal and Installation"

.

3.

CHECK GROUND CIRCUIT

Check continuity between heated steering wheel harness connector terminal and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK HARNESS BETWEEN HEATED STEERING WHEEL RELAY AND HEATED STEERING WHEEL

1.

Turn ignition switch OFF.

2.

Disconnect heated steering wheel relay connector. Refer to 

ST-7, "Component Parts Location (Heated

Steering Wheel)"

.

3.

Disconnect heated steering wheel switch connector. Refer to 

ST-56, "Removal and Installation"

4.

Check continuity between heated steering wheel relay harness connector terminal and heated steering
wheel harness connector terminal.

Heated steering wheel

Condition

Voltage (Approx.)

Connector

Terminal

M303

1 

−

 2

Within 30 minutes after 
turning ON the heated 
steering switch.

Battery voltage

Other conditions.

0 V

Heated steering wheel

Ground

Continuity

Connector

Terminal

M303

2

Existed

ST-24

< SYMPTOM DIAGNOSIS >

HEATED STEERING WHEEL SYSTEM DOES NOT ACTIVATE

5.

Check continuity between heated steering wheel relay harness connector terminal and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts.

5.

CHECK HEATED STEERING WHEEL RELAY

Check heated steering wheel relay. Refer to 

ST-19, "Component Inspection (Heated Steering Wheel Relay)"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace heated steering wheel relay. Refer to 

ST-7, "Component Parts Location (Heated Steering

Wheel)"

.

6.

DETECT MALFUNCTIONING ITEM

Check the following.
• Battery
• Harness for short or open between battery and IPDM E/R. Refer to 

PG-11, "Wiring Diagram - BATTERY

POWER SUPPLY -"

.

• 10A fuse (No.76, located in the IPDM E/R). Refer to 

PG-143, "Fuse, Connector and Terminal Arrangement"

.

• IPDM E/R

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace damaged parts.

7.

CHECK GROUND CIRCUIT

Check continuity between heated steering wheel switch harness connector terminal and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace damaged parts.

8.

CHECK HARNESS BETWEEN HEATED STEERING WHEEL RELAY AND HEATED STEERING WHEEL

SWITCH

1.

Check continuity between heated steering wheel relay harness connector terminal and heated steering
wheel switch harness connector terminal.

2.

Check continuity between heated steering wheel relay harness connector terminal and ground.

Heated steering wheel relay

Heated steering wheel

Continuity

Connector

Terminal

Connector

Terminal

E90

5

M303

1

Existed

Heated steering wheel relay

Ground

Continuity

Connector

Terminal

E90

5

Not existed

Heated steering wheel switch

Ground

Continuity

Connector

Terminal

M52

6

Existed

Heated steering wheel relay

Heated steering wheel switch

Continuity

Connector

Terminal

Connector

Terminal

E90

2

M52

2

Existed

Heated steering wheel relay

Ground

Continuity

Connector

Terminal

E90

2

Not existed

HEATED STEERING WHEEL SYSTEM DOES NOT ACTIVATE

ST-25

< SYMPTOM DIAGNOSIS >

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Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair or replace damaged parts.

9.

CHECK HARNESS BETWEEN FUSE BLOCK (J/B) AND HEATED STEERING WHEEL SWITCH

1.

Check continuity between fuse block (J/B) connector terminal and heated steering wheel switch harness
connector terminal.

2.

Check continuity between fuse block (J/B) harness connector terminal and ground.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Repair or replace damaged parts.

10.

DETECT MALFUNCTIONING ITEM

Check the following.
• Ignition switch
• Harness for short or open between ignition switch and fuse block (J/B). Refer to 

PG-11, "Wiring Diagram -

BATTERY POWER SUPPLY -"

.

• 10A fuse [No.3, located in the fuse block (J/B)]. Refer to 

PG-143, "Fuse, Connector and Terminal Arrange-

ment"

.

• Fuse block (J/B)

Is the inspection result normal?

YES

>> Replace heated steering wheel switch. Refer to 

ST-56, "Removal and Installation"

.

NO

>> Repair or replace damaged parts.

 Fuse block (J/B)

Heated steering wheel switch

Continuity

Connector

Terminal

Connector

Terminal

M1

2A

M52

1

Existed

 Fuse block (J/B)

Ground

Continuity

Connector

Terminal

M1

2A

Not existed