Turn Signal Switch Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power 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 RH signal switch/OFF or ON	OFF: Turn RH switch off ON: Turn RH switch on	-
   Turn Signal Switch (Left)	Turn LH signal switch/OFF or ON	OFF: Turn LH switch off ON: Turn LH switch on	-

   OK

   Normal conditions listed above are displayed.

   Result

   Result	Proceed to
   OK	A
   NG	B

B → See step   2 

A → See step   4 

HINT: 

Inspect the items that did not change as a result of monitoring the Data List.

1. Remove the headlight dimmer switch assembly. Refer to REMOVAL .
   Fig 1: Checking Headlight Dimmer Switch Assembly With Connector End View

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   TURN SIGNAL SWITCH
   
   

   Tester Connection	Switch Condition	Specified Condition
   12 (EL) - 13 (TR)	Turn RH switch off	10 kΩ or higher
   12 (EL) - 15 (TL)	Turn LH switch off	10 kΩ or higher
   12 (EL) - 13 (TR)	Turn RH switch on	Below 1 Ω
   12 (EL) - 15 (TL)	Turn LH switch on	Below 1 Ω

   OK

   Headlight dimmer switch assembly is normal.

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   5 

OK: Go to next step 

1. Disconnect the L47 headlight dimmer switch assembly connector.
2. Disconnect the L27 combination meter sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L27-17 (B) - L47-13 (TR)	Always	Below 1 Ω
   L27-18 (B) - L47-15 (TL)	Always	Below 1 Ω
   L47-13 (TR) - Body ground	Always	10 kΩ or higher
   L47-15 (TL) - Body ground	Always	10 kΩ or higher
   L47-12 (EL) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4