Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK POWER SOURCE AND GROUND CIRCUIT

Turn ignition switch OFF.
Remove the heated steering wheel. Refer to "REMOVAL AND INSTALLATION ".
Turn ignition switch ON.
CAUTION: Never start the engine.
Turn heated steering wheel switch ON.

Check voltage between heated steering wheel harness connector terminals.

VOLTAGE SPECIFICATION

Heated steering wheel		Condition	Voltage (Approx.)
Connector	Terminal	Condition	Voltage (Approx.)
M303	1 - 2	Within 30 minutes after turning ON the heated steering switch.	Battery voltage
M303	1 - 2	Other conditions.	0 V

Is the inspection result normal?

YES: GO TO 2.

NO: GO TO 3.

CHECK HEATED STEERING WHEEL
Check heated steering wheel. Refer to "COMPONENT INSPECTION (HEATED STEERING WHEEL) ".

Is the inspection result normal?

YES: INSPECTION END

NO: Replace heated steering wheel. Refer to "REMOVAL AND INSTALLATION ".

CHECK GROUND CIRCUIT

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

CONTINUITY SPECIFICATION

Heated steering wheel		Ground	Continuity
Connector	Terminal
M303	2		Existed

Is the inspection result normal?

YES: GO TO 4.

NO: Repair or replace damaged parts.

CHECK HARNESS BETWEEN HEATED STEERING WHEEL RELAY AND HEATED STEERING WHEEL

Turn ignition switch OFF.
Disconnect heated steering wheel relay connector. Refer to "COMPONENT PARTS LOCATION (HEATED STEERING WHEEL) ".
Disconnect heated steering wheel switch connector. Refer to "REMOVAL AND INSTALLATION ".

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

CONTINUITY SPECIFICATION

Heated steering wheel relay		Heated steering wheel		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E90	5	M303	1	Existed

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

CONTINUITY SPECIFICATION

Heated steering wheel relay		Ground	Continuity
Connector	Terminal
E90	5		Not existed

Is the inspection result normal?

YES: GO TO 5.

NO: Repair or replace damaged parts.

CHECK HEATED STEERING WHEEL RELAY
Check heated steering wheel relay. Refer to "COMPONENT INSPECTION (HEATED STEERING WHEEL RELAY) ".

Is the inspection result normal?

YES: GO TO 6.

NO: Replace heated steering wheel relay. Refer to "COMPONENT PARTS LOCATION (HEATED STEERING WHEEL) ".
DETECT MALFUNCTIONING ITEM
Check the following.
- Battery
- Harness for short or open between battery and IPDM E/R. Refer to "WIRING DIAGRAM - BATTERY POWER SUPPLY - ".
- 10A fuse (No. 76, located in the IPDM E/R). Refer to "FUSE, CONNECTOR AND TERMINAL ARRANGEMENT ".
- IPDM E/R
  Is the inspection result normal?
  
  YES: GO TO 7.
  
  NO: Repair or replace damaged parts.

CHECK GROUND CIRCUIT

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

CONTINUITY SPECIFICATION

Heated steering wheel switch		Ground	Continuity
Connector	Terminal
M52	6		Existed

Is the inspection result normal?

YES: GO TO 8.

NO: Repair or replace damaged parts.

CHECK HARNESS BETWEEN HEATED STEERING WHEEL RELAY AND HEATED STEERING WHEEL SWITCH

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

CONTINUITY SPECIFICATION

Heated steering wheel relay		Heated steering wheel switch		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E90	2	M52	2	Existed

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

CONTINUITY SPECIFICATION

Heated steering wheel relay		Ground	Continuity
Connector	Terminal
E90	2		Not existed

Is the inspection result normal?

YES: GO TO 9.

NO: Repair or replace damaged parts.

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

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

CONTINUITY SPECIFICATION

Fuse block (J/B)		Heated steering wheel switch		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M1	2A	M52	1	Existed

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

CONTINUITY SPECIFICATION

Fuse block (J/B)		Ground	Continuity
Connector	Terminal
M1	2A		Not existed

Is the inspection result normal?

YES: GO TO 10.

NO: Repair or replace damaged parts.

DETECT MALFUNCTIONING ITEM
Check the following.
- Ignition switch
- Harness for short or open between ignition switch and fuse block (J/B). Refer to "WIRING DIAGRAM - BATTERY POWER SUPPLY - ".
- 10A fuse [No. 3, located in the fuse block (J/B)]. Refer to "FUSE, CONNECTOR AND TERMINAL ARRANGEMENT ".
- Fuse block (J/B)
  Is the inspection result normal?
  
  YES: Replace heated steering wheel switch. Refer to "REMOVAL AND INSTALLATION ".
  
  NO: Repair or replace damaged parts.