Inspection Procedure

1. Turn the light control switch to the TAIL or HEAD position.

   Check if other displays or indicators such as the A/C switch indicator come on.

   OK: 

   Other displays or indicators come on. 

NG: GO TO  LIGHTING SYSTEM 

OK: GO TO NEXT STEP 

1. Disconnect the radio receiver R16 connector.
2. Measure the voltage according to the values in RH R/B - RADIO RECEIVER  .

   Standard voltage 

   RH R/B - RADIO RECEIVER
   
   

   Tester connection	Condition	Specified condition
   ILL+ (R16-2) - Body ground (1)	Light control switch TAIL	10 to 14 V
   ILL+ (R16-10) - Body ground (2)	Light control switch TAIL	10 to 14 V
   (1) Separate Type Amplifier (2) Built-in Type Amplifier

   Fig 1: Checking Harness And Connector (RH R/B - Radio Receiver)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO NEXT STEP 

1. Disconnect the radio receiver R16 or R17 connector and light control rheostat R8 connector.
2. Measure the resistance according to the values in RADIO RECEIVER - LIGHT CONTROL RHEOSTAT  . Standard:

   Standard resistance 

   RADIO RECEIVER - LIGHT CONTROL RHEOSTAT
   
   

   Tester connection	Specified condition
   ILL- (R16-12) - ILL+ (R8-2) (1)	Below 1 Ω
   ILL- (R16-12) - Body ground (1)	10 kΩ or higher
   ILL- (R17-5) - ILL+ (R8-2) (2)	Below 1 Ω
   ILL- (R17-5) - Body ground (2)	10 kΩ or higher
   (1) Separate Type Amplifier (2) Built-in Type Amplifier

   Fig 2: Checking Harness And Connector (Radio Receiver - Light Control Rheostat)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE