High Beam Headlight Circuit [11/2015 -]: Procedure

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. Perform the Active Test according to the display on the Techstream.

   Body Electrical > Main Body > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Head Light Hi	H-LP shade relay (high beam headlights)	ON/OFF	-

   Body Electrical > Main Body > Active Test 

   Tester Display
   Head Light Hi

   OK

   H-LP shade relay operates. (High beam headlights illuminate.)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2015 - 12/2018]  , or refer to  PROBLEM SYMPTOMS TABLE [12/2018 -] 

Result: 

NG 

See step  2

1. Remove the H-LP shade relay.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (H-LP SHADE Relay)

   Standard Resistance

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE H-LP SHADE RELAY 

Result: 

OK 

See step  4

1. Disconnect the A11 headlight assembly LH connector.
2. Disconnect the A34 headlight assembly RH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   (A11, A34)

   (A11)

   (A34)

   Tester Connection	Condition	Specified Condition
   Relay terminal 5 - A11-4 (SOL)	Always	Below 1 Ω
   Relay terminal 5 - A34-4 (SOL)	Always	Below 1 Ω
   Relay terminal 5 or A11-4 (SOL) - Body ground	Always	10 kΩ or higher
   Relay terminal 5 or A34-4 (SOL) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Disconnect the F17 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   (F17)

   (F17)

   Tester Connection	Condition	Specified Condition
   Relay terminal 1 - F17-1 (DIM)	Always	Below 1 Ω
   Relay terminal 1 or F17-1 (DIM) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 07/2020]  , or refer to  REMOVAL [07/2020 -] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR