Inspection Procedure

1. Operate the Techstream according to the display and select the "DATA LIST" or "Data List".
   1. Techstream

      Main Body 

      MAIN BODY - TECHSTREAM DATA LIST CHART
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Dimmer SW	Dimmer switch signal / ON or OFF	ON: Dimmer switch ON OFF: Dimmer switch OFF	-
      High Flasher SW	Passing light switch signal / ON or OFF	ON: Passing light switch ON OFF: Passing light switch OFF	-
      F Fof Light SW	Front fog light switch signal / ON or OFF	ON: Front fog light switch ON OFF: Front fog light switch OFF	-
      Auto Light SW	Auto light switch signal / ON or OFF	ON: Auto light switch ON OFF: Auto light switch OFF	-
      Head Light SW	Headlight switch signal / ON or OFF	ON: Headlight switch ON OFF: Headlight switch OFF	-
      Tail Light SW	Taillight switch signal / ON or OFF	ON: Taillight switch ON OFF: Taillight switch OFF	-

      OK: When combination light switch operation is performed, the result will be the same as above. 

NG: Go to step 2 

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

1. Remove the headlight dimmer switch (see REMOVAL  ).
   Fig 1: Identifying Headlight Dimmer Switch Connector Terminals

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

   Standard resistance 

   HEADLIGHT DIMMER SWITCH ASSEMBLY
   
   

   Tester Connection	Switch Condition	Specified Condition
   18 (T) - 12 (EL)	Light control switch Tail	Below 1 Ω
   	Light control switch HEAD
   20 (H) - 12 (EL)	Light control switch HEAD
   19 (A) -12 (EL)	Light control switch AUTO
   4 (BFG) - 3 (LFG)	Front fog light switch ON
   17 (HF) - 12 (EL)	Dimmer switch High
   11 (HU) - 12 (EL)	Dimmer switch Low

NG: REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY  (see REMOVAL  )

OK: Go to next step 

Fig 2: Identifying Headlight Dimmer Switch And Main Body ECU Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the J10 switch connector.
2. Disconnect the J3, J4 and DD ECU connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND
   
   

   Tester Connection	Condition	Specified Condition
   J10-4 (BFG) - J3-28 (FFOG)	Always	Below 1 Ω
   J10-19 (A) - J4-21 (A)
   J10-20 (H) - J3-17 (HEAD)
   J10-18 (T) - J4-23 (TAIL)
   J10-17 (HF) - J4-13 (HF)
   J10-11 (HU) - DD-13 (HU)
   J10-12 (EL) - Body ground
   J10-3 (LFG) -Body ground
   J10-4 (BFG) - Body ground	Always	10 kΩ or higher
   J10-19 (A) - Body ground
   J10-20 (H) - Body ground
   J10-18 (T) - Body ground
   J10-17 (HF) - Body ground
   J10-11 (HU) - Body ground

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE MAIN BODY ECU