Inspection Procedure

Fig 1: Identifying Terminals Of Main Body ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the 4J and 4S main body ECU connectors.*1
2. Disconnect the 4J, 4E and 4M main body ECU connectors.*2
3. Disconnect the D9 running light relay assembly connector.*3

   HINT:

   *1: Hatchback, Sedan with front fog light

   *2: Sedan without front fog light

   *3: w/ Daytime running light system

4. Measure the resistance.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester connection	Condition	Specified Condition
   4J-3 Body ground	Light control switch OFF --> HEAD Headlight dimmer switch LOW position	10 kΩ or higher --> Below 1 Ω
   4J-4 - Body ground	Light control switch OFF --> HEAD Headlight dimmer switch HIGH position	10 kΩ or higher --> Below 1 Ω
   4J-4 - Body ground	Light control switch HIGH position	10 kΩ or higher --> Below 1 Ω
   4S-9 - Body ground*1	Light control switch OFF --> TAIL	10 kΩ or higher --> Below 1 Ω
   4S-9 - Body ground*1	Light control switch OFF --> HEAD	10 kΩ or higher --> Below 1 Ω
   4E-10-4M-4*2	Light control switch OFF --> TAIL	10 kΩ or higher --> Below 1 Ω
   4E-10-4M-4*2	Light control switch OFF --> HEAD	10 kΩ or higher --> Below 1 Ω
   4M-9 - Body ground*2	Front fog light switch OFF --> ON	10 kΩ or higher --> Below 1 Ω
   D9-7 - Body ground*3	Light control switch OFF --> HEAD	10 kΩ or higher --> Below 1 Ω
   HINT: *1: Hatchback, Sedan with *2: Sedan without front fog *3: w/ Daytime running light system

5. Reconnect the main body ECU connectors.
6. Reconnect the running light relay assembly connector*.

   HINT:

   *: w/ Daytime running light system

NG: Go to step 2 

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

1. Inspect the light control switch.
   1. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      10(T1)-13(B1)	TAIL	Below 1 Ω
      10{T1)-13(B1)	OFF	10 kΩ or higher
      10(T1)-13(B1)	HEAD	Below 1 Ω
      10(T1)-13(B1)	OFF	10 kΩ or higher
      11 (ED)-12(RF)	HEAD	Below 1 Ω
      11 (ED)-12(RF)	OFF	10 kΩ or higher

2. Inspect the headlight dimmer switch.
   1. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      9 (HU) -11 (ED)	FLASH	Below 1 Ω
      8(HL)-11(ED)	LOW BEAM	Below 1 Ω
      9 (HU) -11 (ED)	HI BEAM	Below 1 Ω

      Fig 2: Identifying Terminals Of Headlight Dimmer Switch Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect the turn signal switch.
   1. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      6(TR)-7(E)	Right	Below 1 Ω
      6(TR)-7(E)	Neutral	10 kΩ or higher
      5(TL)-7(E)	Left	Below 1 Ω
      5(TL)-7(E)	Neutral	10 kΩ or higher

4. Inspect the front fog light switch.
   1. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

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

NG: REPLACE HEADLIGHT DIMMER SWITCH 

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR