Illumination Circuit [09/2016 - 09/2017]: 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 [10/2014 - ] 

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. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - ] 

Result: 

OK 

See step  3

1. Check if the illumination for the steering pad switch assembly or radio receiver assembly comes on when the light control switch is turned to the head or tail position.

   Result

   Result	Proceed to
   Illumination for steering pad switch assembly does not come on.	A
   Illumination for radio receiver assembly does not come on.	B

Result: 

B 

See step  7

Result: 

A 

See step  4

1. Disconnect the spiral cable sub-assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Spiral Cable Sub-assembly)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   I4-13 (IL+2) - Body ground	Light control switch in tail or head position	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Remove the steering pad switch assembly.

   Refer to REMOVAL [10/2014 - 09/2017]

2. Inspect the steering pad switch assembly.

   Refer to INSPECTION [09/2016 - 09/2017]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

OK 

See step  6

1. Remove the spiral cable sub-assembly.

   Refer to REMOVAL [10/2014 - 09/2017]

2. Inspect the spiral cable sub-assembly.

   Refer to INSPECTION [10/2014 - 09/2017]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

1. Disconnect the radio receiver assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Radio Receiver Assembly)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   I38-14 (ILL+) - Body ground	Light control switch in tail or head position	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

1. Disconnect the I38 radio receiver assembly connector.
2. Disconnect the I10 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I38-13 (ILL-) - I10-39 (ILL-)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR