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

1. Check if the illumination for the radio receiver assembly, steering pad switch assembly, heater control switch or other components (hazard switch, transmission control switch, etc.) comes on when the light control switch is turned to the head or tail position.

   Result

   Result	Proceed to
   Illumination comes on for all components except steering pad switch assembly.	A
   Illumination comes on for all components except multi-display assembly.	B
   Illumination comes on for all components except radio receiver assembly.	C
   Illumination comes on for all components except remote operation controller assembly.	D
   No illumination comes on (radio receiver assembly, steering pad switch, remote touch, hazard switch, heater control switch, etc.).	E

Result: 

B 

See step  6

Result: 

C 

See step  7

Result: 

D 

See step  9

Result: 

E 

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

Result: 

A 

See step  2

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	Power switch off, 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  3

1. Remove the steering pad switch assembly.

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

2. Inspect the steering pad switch assembly.

   Refer to INSPECTION [10/2014 - 09/2016]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  4

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: 

NG 

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

Result: 

OK 

See step  5

1. Disconnect the I38 radio receiver assembly connector.
2. Disconnect the I4 spiral cable sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I38-32 (SWG) - I4-3 (EAU)	Always	Below 1 Ω
   I38-32 (SWG) or I4-3 (EAU) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2014 - 09/2016] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the multi-display assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Multi-display Assembly)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I42-13 (GND1) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   I42-2 (ILL) - Body ground	Power switch off, light control switch in tail or head position	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MULTI-DISPLAY ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

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	Power switch off, 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
   I38-13 (ILL-) or I10-39 (ILL-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2014 - 09/2016] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the remote operation controller assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Remote Operation Controller Assembly)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   I71-2 (ILL+) - Body ground	Power switch off, 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  10

1. Disconnect the I71 remote operation controller 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
   I71-5 (ILL-) - I10-39 (ILL-)	Always	Below 1 Ω
   I71-5 (ILL-) or I10-39 (ILL-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE REMOTE OPERATION CONTROLLER ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR