Steering System (Circuit Diagnosis)

1. Turn ignition switch OFF.
2. Remove the steering wheel. Refer to Removal and Installation .
3. Turn ignition switch ON.
4. Turn heated steering wheel switch ON.
5. Check voltage between heated steering wheel harness connector terminals.

   Connector	Terminal		Voltage (Approx.)
   	+	-
   M114	1	2	Battery voltage

Is the inspection result normal?

YES

GO TO 2.

NO

GO TO 3.

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 continuity between heated steering wheel harness connector terminal and ground.

Is the inspection result normal?

YES

GO TO 4.

NO

Repair or replace harness or connector.

1. Turn ignition switch OFF.
2. Disconnect heated steering wheel relay connector.
3. Check continuity between heated steering wheel relay harness connector terminal and steering wheel harness connector terminal.

   Heated steering wheel relay		Heated steering wheel		Continuity
   Connector	Terminal	Connector	Terminal
   M90	5	M114	1	Yes

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

   Heated steering wheel relay		Ground	Continuity
   Connector	Terminal
   M90	5		No

Is the inspection result normal?

YES

GO TO 5.

NO

Repair or replace harness or connector.

Check heated steering relay. Refer to Component Inspection (Heated Steering Relay) .

Is the inspection result normal?

YES

GO TO 6.

NO

Replace heated steering relay.

Check the following:

• Battery
• Harness for open or short between battery and 10 A fuse (No. 74)
• 10 A fuse (No. 74)
• Harness for open or short between 10 A fuse (No. 74) and heated steering relay

Is the inspection result normal?

YES

GO TO 7.

NO

Repair or replace damaged parts.

1. Disconnect heated steering wheel switch.
2. 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 harness or connector.

1. Disconnect A/C auto amp.
2. Check continuity between heated steering wheel relay harness connector terminal and A/C auto amp. harness connector terminal.

   Heated steering relay		A/C Auto amp.		Continuity
   Connector	Terminal	Connector	Terminal
   M90	2	M50	20	Yes

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

   Heated steering relay		Ground	Continuity
   Connector	Terminal
   M90	2		No

Is the inspection result normal?

YES

GO TO 9.

NO

Repair or replace harness or connector.

1. Check continuity between A/C auto amp. harness connector terminal and heated steering wheel switch harness connector terminal.

   A/C Auto amp.		Heated steering wheel switch		Continuity
   Connector	Terminal	Connector	Terminal
   M50	8	M48	1	Yes

2. Check continuity between A/C auto amp. harness connector terminal and ground.

   A/C Auto amp.		Ground	Continuity
   Connector	Terminal
   M50	8		No

Is the inspection result normal?

YES

GO TO 10.

NO

Repair or replace harness or connector.

Check heated steering wheel switch. Refer to Component Inspection (Heated Steering Wheel Switch) .

Is the inspection result normal?

YES

Replace A/C Auto amp. Refer to Removal and Installation .

NO

Replace heated steering wheel switch. Refer to Removal and Installation .