Diagnosis Procedure

Regarding Wiring Diagram information, refer to the appropriate Wiring Diagram .

1. CHECK STEERING WHEEL AUDIO CONTROL SWITCH RESISTANCE 
   1. Turn ignition switch OFF.
   2. Disconnect combination switch connector M199.
   3. Check resistance between combination switch connector terminals.

   Combination switch connector M199		Condition	Resistance ? (Approx.)
   Terminal	Terminal
   16	19	Depress SOURCE switch.	1
   		Depress switch.	121
   		Depress switch.	321
   		Depress switch.	723
   		Depress ENTER switch.	2023
   17		Depress switch.	1
   		Depress switch.	121
   		Depress switch.	321
   		Depress menu right switch.	723
   		Depress menu left switch.	2023

   Is the inspection result normal?

   YES

   GO TO 2 .

   NO

   Replace steering switches. Refer to Removal and Installation .

2. CHECK HARNESS BETWEEN COMBINATION SWITCH AND COMBINATION METER 
   1. Disconnect combination meter connector M24 and combination switch connector M30.
   2. Check continuity between combination meter connector M24 and combination switch connector M30.

      Combination meter		Combination switch		Continuity
      Connector	Terminal	Connector	Terminal
      M24	1	M30	12	Yes
      	22		10
      	23		14

   3. Check continuity between combination meter connector M24 and ground.

      Combination meter		Ground	Continuity
      Connector	Terminal
      M24	1	-	No
      	22
      	23

   Is the inspection result normal?

   YES

   GO TO 3 .

   NO

   Repair or replace harness or connectors.

3. CHECK COMBINATION SWITCH 

   Check continuity between combination switch connectors M30 and M199.

   Combination switch				Continuity
   Connector	Terminal	Connector	Terminal
   M30	10	M199	16	Yes
   	12		19
   	14		17

   Is the inspection result normal?

   YES

   GO TO 4 .

   NO

   Replace spiral cable. Refer to Removal and Installation .

4. CHECK HARNESS BETWEEN COMBINATION METER AND AV CONTROL UNIT 
   1. Disconnect AV control unit connector M98.
   2. Check continuity between combination meter connector M25 and AV control unit connector M98.

      Combination meter		AV control unit		Continuity
      Connector	Terminal	Connector	Terminal
      M25	51	M98	21	Yes
      	52		22

   3. Check continuity between combination meter connector M25 and ground.

      Combination meter		Ground	Continuity
      Connector	Terminal
      M25	51	-	No
      	52

   Is the inspection result normal?

   YES

   Replace AV control unit. Refer to Removal and Installation .

   NO

   Repair or replace harness or connectors.