Turn Signal Switch Circuit [09/2014 - 03/2019]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Combination Meter / Data List.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Combination Meter > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Turn Signal Switch (Right)	Turn signal switch (right) signal	ON or OFF	ON: Turn signal switch (right) on OFF: Turn signal switch (right) off	-
   Turn Signal Switch (Left)	Turn signal switch (left) signal	ON or OFF	ON: Turn signal switch (left) on OFF: Turn signal switch (left) off	-

   Body Electrical > Combination Meter > Data List 

   Tester Display
   Turn Signal Switch (Right)
   Turn Signal Switch (Left)

   OK

   Normal conditions listed above are displayed.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2014 - 03/2019] 

Result: 

NG 

See step  2

1. Remove the headlight dimmer switch assembly.

   Refer to REMOVAL [09/2014 - 03/2019]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Headlight Dimmer Switch Assembly)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   15 (TR) - 16 (E)	Turn signal switch in neutral position	10 kΩ or higher
   14 (TL) - 16 (E)	Turn signal switch in neutral position	10 kΩ or higher
   17 (CR) - 16 (E)	Turn signal switch in neutral position	10 kΩ or higher
   15 (TR) - 16 (E)	Turn signal switch in right turn position	Below 1 Ω
   17 (CR) - 16 (E)	Turn signal switch in full right turn position	Below 1 Ω
   14 (TL) - 16 (E)	Turn signal switch in left turn position	Below 1 Ω
   17 (CR) - 16 (E)	Turn signal switch in full left turn position	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY. Refer to  REMOVAL [09/2014 - 03/2019] 

Result: 

OK 

See step  3

1. Disconnect the O23 windshield wiper switch assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O22-16 (E) - O23-6 (GND1)	Always	Below 1 Ω
   O22-14 (TL) - O23-13 (TL1)	Always	Below 1 Ω
   O22-15 (TR) - O23-14 (TR1)	Always	Below 1 Ω
   O22-17 (CR) - O23-12 (CR1)	Always	Below 1 Ω
   O22-16 (E) - Body ground	Always	10 kΩ or higher
   O22-14 (TL) - Body ground	Always	10 kΩ or higher
   O22-15 (TR) - Body ground	Always	10 kΩ or higher
   O22-17 (CR) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the O4 combination meter assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O23-16 (TR2) - O4-4 (ER)	Always	Below 1 Ω
   O23-17 (TL2) - O4-5 (EL)	Always	Below 1 Ω
   O23-16 (TR2) - Body ground	Always	10 kΩ or higher
   O23-17 (TL2) - 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 [09/2014 - 03/2019] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR