Inspection Procedure

1. Remove the light control rheostat.
2. Measure the resistance of the rheostat.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   5 (T) - 8 (TC)	Not in tail cancel position	Below 1 Ω
   	Tail cancel position (rheostat knob is fully turned up)	10 kΩ or higher

   Fig 1: Identifying Light Control Rheostat Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE LIGHT CONTROL RHEOSTAT 

OK: GO TO NEXT STEP 

1. Disconnect the R7 rheostat connector.
2. Disconnect the C10 meter connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   R7-8 (TC) - C10-28	Below 1 Ω
   R7-3 (E) - Body ground

4. Measure the voltage of the wire harness side connectors.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Switch Condition	Specified Condition
   R7-5 (T) - Body ground	Light control switch is TAIL	10 to 14 V

   Fig 2: Identifying R7 Rheostat And C10 Meter Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE COMBINATION METER