Turn Signal Switch Circuit: 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 display on the Techstream.
   COMBINATION METER
   
   

   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	-

   OK

   Normal conditions listed above are displayed.

NG → See step   2 

OK → See step   4 

1. Remove the headlight dimmer switch assembly. Refer to REMOVAL .
2. Measure the resistance according to the value(s) in the table below.
   Fig 1: Measuring Resistance Of Headlight Dimmer Switch Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   12 (TR) - 15 (EL)	Turn signal switch in neutral position	10 kΩ or higher
   11 (TL) - 15 (EL)	Turn signal switch in neutral position	10 kΩ or higher
   12 (TR) - 15 (EL)	Turn signal switch in right turn position	Below 1 Ω
   11 (TL) - 15 (EL)	Turn signal switch in left turn position	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   5 

OK: Go to next step 

1. Disconnect the D8 combination meter assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D18-12 (TR) - D8-3 (ER)	Always	Below 1 Ω
   D18-11 (TL) - D8-4 (EL)	Always	Below 1 Ω
   D18-15 (EL) - Body ground	Always	Below 1 Ω
   D18-12 (TR) - Body ground	Always	10 kΩ or higher
   D18-11 (TL) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4