Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK STEERING WHEEL AUDIO CONTROL SWITCH RESISTANCE 
   1. Turn ignition switch OFF.
   2. Disconnect combination switch connector M149.
   3. Check resistance between combination switch connector terminals.

      Combination switch connector M149		Condition	Resistance Ω (Approx.)
      Terminal	Terminal
      14	17	Depress SOURCE switch.	1
      		Depress Triangle switch.	121
      		Depress DOWN TRIANGLE switch.	321
      		Depress switch.	723
      		Depress ENTER switch.	2023
      15		Depress switch.	1
      		Depress switch.	121
      		Depress switch.	321
      		Depress switch.	723
      		Depress DISP switch.	2023

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Replace steering wheel audio control switch. 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	3	M30	24	Yes
      	24		33
      	4		31

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

      Combination meter		Ground	Continuity
      Connector	Terminal
      M24	3	-	No
      	24
      	4

      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 M149.

   Combination switch				Continuity
   Connector	Terminal	Connector	Terminal
   M30	24	M149	14	Yes
   	31		15
   	33		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 M122.
   2. Check continuity between combination meter connector M24 and AV control unit connector M161.

      Combination meter		AV control unit		Continuity
      Connector	Terminal	Connector	Terminal
      M24	14	M161	6	Yes
      	15		16
      	16		15

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

      Combination meter		Ground	Continuity
      Connector	Terminal
      M24	14	-	No
      	15
      	16

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair or replace harness or connectors.

5. CHECK AV CONTROL UNIT VOLTAGE 
   1. Connect combination meter connector M24 and AV control unit connector M161.
   2. Turn ignition switch ON.
   3. Check voltage between terminals of AV control unit connector M122.

      AV control unit M161		Voltage (Approx.)
      (+)	(-)
      Terminal	Terminal
      6	15	5.0 V
      16

      Is the inspection result normal? 

      YES: Replace combination meter. Refer to "REMOVAL AND INSTALLATION ".

      NO: Replace AV control unit. Refer to "REMOVAL AND INSTALLATION - AV CONTROL UNIT ".