Diagnosis Procedure

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

   Connector	Terminals		Voltage (Approx.)
   	+	-
   Refer to appropriate wiring diagram.	5	6	Battery voltage

Is the inspection result normal?

YES

GO TO 2 .

NO

GO TO 3 .

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

Is the inspection result normal?

YES

GO TO 3 .

NO

Repair harness or connector.

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

   Heated steering relay		Heated steering wheel switch		Continuity
   Connector	Terminal	Connector	Terminal
   Refer to appropriate wiring diagram.	5	M145	5	Yes

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

   Connector	Terminal	Ground	Continuity
   Refer to appropriate wiring diagram.	5		No

Is the inspection result normal?

YES

GO TO 4 .

NO

Repair harness or connector.

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

Is the inspection result normal?

YES

GO TO 5 .

NO

Replace heated steering relay.

Check the following:

• Battery
• Harness for open or short between battery and 10A fuse (No. 63)
• 10A fuse (No. 63)
• Harness for open or short between 10A fuse (No. 63) and heated steering relay

Is the inspection result normal?

YES

GO TO 6 .

NO

Repair 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
   Refer to appropriate wiring diagram.	8	M145	1	Yes

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

   A/C auto amp.		Ground	Continuity
   Connector	Terminal
   Refer to appropriate wiring diagram.	8		No

Is the inspection result normal?

YES

GO TO 7 .

NO

Repair 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

Removal and Installation