Illumination Circuit [12/2019 - 10/2022]: 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 [12/2019 - ] 

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 [12/2019 - 11/2023] 

Result: 

OK 

See step  3

1. Disconnect the R16 television display assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   R16-15 (ILL+) - Body ground	Ignition switch off Light control switch in tail or head position	11 to 14 V

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R16-16 (ILL-) - Body ground	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 [12/2019 - 10/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR