Diagnosis Procedure

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

1. CHECK WARNING SYSTEMS SWITCH SIGNAL INPUT 
   1. Turn the ignition switch ON.
   2. Check voltage between ITS control unit harness connector and ground.

      Terminals			Condition	Voltage (Approx.)
      (+)		(-)
      ITS control unit		Ground	Warning systems switch
      Connector	Terminal
      M58	32		Pressed	0 V
      			Released	12 V

      Is the inspection result normal? 

      YES: Replace the ITS control unit. Refer to "REMOVAL AND INSTALLATION ".

      NO: GO TO 2.

2. CHECK WARNING SYSTEMS SWITCH 
   1. Turn ignition switch OFF.
   2. Remove warning systems switch.
   3. Check warning systems switch. Refer to "COMPONENT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Replace the warning systems switch. Refer to "REMOVAL AND INSTALLATION ".

3. CHECK WARNING SYSTEMS SWITCH GROUND CIRCUIT 

   Check continuity between warning system switch harness connector terminal and ground.

   Warning system switch		Ground	Continuity
   Connector	Terminal
   M62	8		Yes

   Is the inspection result normal? 

   YES: GO TO 4.

   NO: Repair harness or connector.

4. CHECK WARNING SYSTEMS SWITCH SIGNAL INPUT CIRCUIT FOR OPEN 
   1. Disconnect the ITS control unit connector.
   2. Check continuity between the ITS control unit harness connector and warning system switch harness connector.

      ITS control unit		Warning system switch		Continuity
      Connector	Terminal	Connector	Terminal
      M58	32	M62	6	Yes

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair the harnesses or connectors.

5. CHECK WARNING SYSTEMS SWITCH SIGNAL INPUT CIRCUIT FOR SHORT 

   Check continuity between the ITS control unit harness connector and ground.

   ITS control unit		Ground	Continuity
   Connector	Terminal
   M58	32		No

   Is the inspection result normal? 

   YES: Replace the ITS control unit. Refer to "REMOVAL AND INSTALLATION ".

   NO: Repair the harnesses or connectors.