High Beam Headlight Circuit: Procedure

1. Check the operation of the low beam headlights.

   OK

   Low beam headlights operate normally.

NG → See step   11 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Check that the high beam headlights illuminate.
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Head Light Hi	High beam headlights	ON/OFF	-

   OK

   High beam headlights illuminate.

NG → See step   3 

OK → See step   12 

1. Check the vehicle condition.

   Result

   Result	Proceed to
   w/ Daytime Running Light System	A
   w/o Daytime Running Light System	B

B → See step   8 

A: Go to next step 

1. Connect a positive (+) lead from the battery to terminal 6 (+B).
   Fig 1: Identifying Running Light Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect a negative (-) lead from the battery to terminals 4 (H) and 3 (E).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   1 (HLOR) - Battery negative	Always	11 to 14 V
   5 (HLOL) - Battery negative	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Running Light Relay)

NG → REPLACE RUNNING LIGHT RELAY 

OK: Go to next step 

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   DRL relay terminal 6 (+B) - Body ground	Power switch off	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   DRL relay terminal 3 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the F8 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   DRL relay terminal 4 (H) - F8-2	Always	Below 1 Ω
   F8-2 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   13 

1. Remove the headlight dimmer relay from the engine room relay block.
   Fig 2: Inspecting Head LP Relay

   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	Voltage is not applied between terminals 1 and 2	10 kΩ or higher
   3 - 5	Voltage is 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.

   Standard Voltage

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the F8 main body ECU (multiplex network body ECU) connector.
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 - F8-2	Always	Below 1 Ω
   F8-2 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   13