High Beam Headlight Circuit [07/2014 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. According to the display on the Techstream, perform the Active Test.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Head Light Hi	Headlight dimmer relay	OFF or ON	-

   OK

   Headlight dimmer relay operates (High beam headlight illuminate.)

NG → See step   2 

OK → See step   6 

1. Remove the headlight dimmer relay (DIM relay).
2. Inspect the headlight dimmer relay (DIM relay). Refer to ON-VEHICLE INSPECTION [07/2014 - ] .

NG → REPLACE HEADLIGHT DIMMER RELAY (DIM RELAY) 

OK: Go to next step 

1. Remove the headlight dimmer relay (DIM relay) from the No. 2 engine room relay block.

   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
   DIM-1 - Body ground*1	Always	11 to 14 V
   DIM-2 - Body ground*2	Always	11 to 14 V
   DIM-3 - Body ground*1	Always	11 to 14 V
   DIM-5 - Body ground*2	Always	11 to 14 V

   • *1: for DRL Bulb Type
   • *2: for DRL LED Type
   TEXT IN ILLUSTRATION
   
   

   *A	for DRL LED Type
   *B	for DRL Bulb Type
   *1	No. 2 Engine Room Relay Block
   *2	Headlight Dimmer Relay (DIM Relay) Holder

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the headlight dimmer relay (DIM relay) from the No. 2 engine room relay block.
2. Disconnect the 3C instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   DIM-2 - 3C-35*1	Always	Below 1 Ω
   DIM-1 - 3C-35*2	Always	Below 1 Ω
   DIM-2 or 3C-35*1 - Body ground	Always	10 kΩ or higher
   DIM-1 or 3C-35*2 - Body ground	Always	10 kΩ or higher

   • *1: for DRL Bulb Type
   • *2: for DRL LED Type

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL [07/2014 - ] .
2. Remove the main body ECU from the instrument panel junction block assembly. Refer to REMOVAL [07/2014 - ] .
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Instrument Panel Junction Block Assembly)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3C-35 - MB-22 (DIM)	Always	Below 1 Ω

NG → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

OK → See step   6