Headlight (HI-BEAM) Circuit: Procedure

1. Check the operation of the LO-beam headlights.

   OK

   LO-beam headlights operate normally.

NG → See step   6 

OK: Go to next step 

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. Check the operation.
   MAIN BODY:
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Head Light HI	HI-beam headlight relay	ON / OFF	-

   OK

   Relay operates (HI-beam headlights illuminate).

NG → See step   3 

OK → See step   5 

1. Remove the engine room junction block assembly from the engine room relay block.
   Fig 1: Measuring Voltage Of Engine Room Junction Block Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the positive (+) lead from the battery to terminal 2D-1.
3. Connect the negative (-) lead from the battery to terminals 2A-3, 2A-5, 2A-17 and 2B-8.
4. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   2B-1 - Battery negative	Always	11 to 14 V
   2B-5 - Battery negative	Always	11 to 14 V

NG → REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY 

OK: Go to next step 

1. Disconnect the 2A engine room junction block assembly connector.
   Fig 2: Checking Harness And Connector (Engine Room Junction Block Assembly - Instrument Panel Junction Block Assembly)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the 1D instrument panel junction block connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   2A-5 - 1D-9	Always	Below 1 Ω
   2A-5 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)