Inspection Procedure

HINT:

Before starting the procedure, check that the multiplex communication system DTCs are not output (See DTC CHECK/CLEAR ).

1. READ VALUE OF INTELLIGENT TESTER 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the engine switch on (IG).
   3. Turn the intelligent tester on.
   4. Select the item (s) below in the DATA LIST, and read the display on the intelligent tester.

      DATA LIST: COMBI SW (Combination Switch ECU) 

      DATA LIST
      
      

      Item	Measurement Item / Display (Range)	Normal Condition,	Diagnostic Note
      F FOG LIGHT SW	Front fog light switch signal / ON or OFF	ON: Front fog light switch is in ON position OFF: Front fog light switch is hot in ON position	-
      HIGH FLASHER SW	Passing light switch signal / ON or OFF	ON: Headlight dimmer switch is in FLASH (PASS) position OFF: Headlight dimmer switch is not in FLASH (PASS) position	-
      DIMMER HI SW	High beam switch signal / ON or OFF	ON: Headlight dimmer switch is in HI position OFF: Headlight dimmer switch is not in HI position	-
      LIGHT AUTO SW	Auto light switch signal / ON or OFF	ON: Light control switch is in AUTO position OFF: Light control switch is not in AUTO position	-
      HEAD LIGHT SW	Headlight control switch signal / ON or OFF	ON: Light control switch is in HEAD position OFF: Light control switch is not in HEAD position,	-
      TAIL LIGHT SW	Taillight switch signal / ON or OFF	ON: Light control switch is in TAIL or HEAD position OFF: Light control switch is off	-
      TURN LEFT SW	Turn signal switch LH signal / ON or OFF	ON: Light control switch is in LH position OFF: Light control switch is not in LH position	-
      TURN RIGHT SW	Turn signal switch RH signal / ON or OFF	ON: Light control switch is in RH position OFF: Light control switch is not in RH position	-
      IG SW SIG	Engine switch signal / ON or OFF	ON: Engine switch on (IG) OFF: Engine switch off	-

      OK: Condition information can be displayed. 

   NG: Go to step 2 

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

2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY 

   HINT:

   Inspect the items that did not change as a result of monitoring the DATA LIST.

   1. Remove the headlight dimmer switch assembly.
   2. Measure the resistance according to the value (s) in the table below.

      Standard resistance: Light Control Switch 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Switch Condition	Specified Condition
      f1-12 (EL) - f1-18 (T)	OFF	10 kΩ or higher
      f1-18 (T) - f1-19 (AUTO)	OFF	10 kΩ or higher
      f1-19 (AUTO) - f1-20 (H)	OFF	10 kΩ or higher
      f1-12 (EL) - f1-18 (T)	TAIL	Below 1 Ω
      f1-12 (EL) - f1-18 (T)	HEAD	Below 1 Ω
      f1-18 (T) - fl-20 (H)	HEAD	Below 1 Ω
      f1-12 (EL) - f1-19 (AUTO)	AUTO	Below 1 Ω

      Fig 1: Identifying Headlight Dimmer Switch Assembly Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Headlight Dimmer Switch 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Switch Condition	Specified Condition
      f1-11 (HU) - f1-12 (EL)	LOW BEAM	Below 1 Ω
      f1-11 (HU) - f1-12 (EL)	HI BEAM	Below 1 Ω
      f1-12 (EL) - f1-17 (HF)	HI BEAM	Below 1 Ω

      Turn Signal Switch 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Switch Condition	Specified Condition
      f1-12 (EL) - f1-13 (TR)	Right turn	Below 1 Ω
      f1-12 (EL) - f1-13 (TR)	Neutral	10 kΩ or higher
      f1-12 (EL) - f1-15 (TL)	Neutral	10 kΩ or higher
      f1-12 (EL) - f1-15 (TL)	Left turn	Below 1 Ω

      Fog Light Switch 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Switch Condition	Specified Condition
      f1-3 (LFG) - f1-4 (BFG)	OFF	10 kΩ or higher
      f1-3 (LFG) - f1-4 (BFG)	Fog light switch ON	Below 1 Ω

   NG: REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY 

   OK: Go to Next Step 

3. CHECK HARNESS AND CONNECTOR 
   1. Disconnect the J26 windshield wiper switch assembly connector.
   2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      J26-5 (E) - Body ground	Always	Below 1 Ω

   3. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      J26-1 (B) - J26-5 (E)	Always	10 to 14 V
      J26-2 (IG) - J26-5 (E)	Engine switch on (IG)	10 to 14 V

      Fig 2: Identifying J26 Windshield Wiper Switch Assembly Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY