Turn Signal Light Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Body / Active Test.
5. Check the operation.
   BODY (BODY ECU)
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Turn Light RH Relay Operation	RH side turn signal lights operation	ON/OFF	-
   Turn Light LH Relay Operation	LH side turn signal lights operation	ON/OFF	-

   OK

   Turn signal lights flash.

NG → See step   2 

OK → PROCEED TO  PROBLEM SYMPTOMS TABLE  NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

1. Disconnect the connector from the turn signal flasher.
   Fig 1: Identifying Turn Signal Flasher Connector Terminals

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

   Standard voltage

   Tester Connection	Condition	Specified Condition
   B (D19-4) - Body ground	Always	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying Ignition Switch Circuit Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   IG (D19-1) - Body ground	Ignition switch on (IG)	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 3: Identifying Terminals Of Turn Signal Flasher Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   E (D19-7)- Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect turn signal flasher assembly.

   OK

   Turn signal flasher assembly is normal.

NG → REPLACE TURN SIGNAL FLASHER ASSEMBLY 

OK: Go to next step 

1. Disconnect the turn signal flasher connector.
   Fig 4: Identifying Turn Signal Flasher Assembly (Instrument Panel Junction) Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect connectors II and D9 from the instrument panel J/B assembly.
3. Measure the resistance according to the value(s) in the table below.
   Fig 5: Identifying Instrument Panel J/B Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   EL (D19-5) - TRNL (D9-4)	Always	Below 1 Ω
   ER (D19-6) - TRNR (II-5)	Always	Below 1 Ω
   EL (D19-5) - Body ground	Always	10 kΩ or higher
   ER (D19-6) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect the harness and connectors related to each turn signal light, referring to the wiring diagram.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → PROCEED TO  PROBLEM SYMPTOMS TABLE  NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE