Headlight (HI-BEAM) Circuit: Procedure

1. Using the Techstream, perform the Active Test. Refer to DATA LIST / ACTIVE TEST .
   MAIN BODY
   
   

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

   OK

   Relay operates (high beam headlights illuminate).

NG → See step   2 

OK → See step   5 

1. Remove the headlight dimmer relay from the engine room relay block, junction block.
   Fig 1: Identifying Headlight Dimmer Relay Connector Terminals

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	Battery voltage not applied between terminals 1 and 2	10 kΩ or higher
   	Battery voltage applied between terminals 1 and 2	Below 1 Ω

NG → REPLACE HEADLIGHT DIMMER RELAY 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying Headlight Relay [H-LP LO] Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Headlight dimmer relay terminal 2 - Body ground	Always	11 to 14 V
   Headlight dimmer relay terminal 3 - Body ground

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Headlight Dimmer Relay)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the main body ECU. Refer to REMOVAL .
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Headlight dimmer relay terminal 1 - A-22 (DIM)	Always	Below 1 Ω
   A-22 (DIM) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5