Illumination Circuit [08/2019 - ]: Procedure

1. Check if the rheostat function operates normally.

   OK

   The rheostat function operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - ] 

Result: 

OK 

See step  2

1. Check if the instrument panel illumination comes on normally.

   OK

   The instrument panel illumination comes on normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO LIGHTING SYSTEM (INT). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - ] 

Result: 

OK 

See step  3

1. Disconnect the television display assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Television Display Assembly)

2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   U13-15 (ILL+) - Body ground	Engine switch on (IG), light control switch TAIL	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the U13 television display assembly connector.
2. Disconnect the H139 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   U13-16 (ILL-) - H139-22 (ILL-)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2019 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR