High Beam Headlight Circuit [08/2020 - ]: 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. Check that the high beam headlights illuminate.

   Body Electrical > Main Body > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Head Light Hi	High beam headlights	ON or OFF	-

   Body Electrical > Main Body > Active Test 

   Tester Display
   Head Light Hi

   OK

   The 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 [08/2020 - 12/2021]  , or refer to  PROBLEM SYMPTOMS TABLE [12/2021 - ] 

Result: 

NG 

See step  2

1. Remove the H-LP SHADE relay from the No. 1 engine room relay block.
2. Inspect the H-LP SHADE relay.

   Refer to ON-VEHICLE INSPECTION [02/2017 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE H-LP SHADE RELAY 

Result: 

OK 

See step  3

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Relay terminal 2- Body ground	Always	11 to 14 V
   Relay terminal 5- Body ground	Always	11 to 14 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	No. 1 Engine Room Relay Block
   *2	H-LP SHADE Relay Holder

   Result

   Result	Proceed to
   OK (for TMMT Made)	A
   OK (for TMC Made)	B
   NG	C

Result: 

B 

See step  5

Result: 

C 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

A 

See step  4

1. Disconnect the A87 headlight assembly LH connector.
2. Disconnect the A89 headlight assembly RH connector.
3. Measure the resistance according to the value(s) in the chart below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Relay terminal 3 - A87-8 (HI)	Always	Below 1 Ω
   Relay terminal 3 - A89-8 (HI)	Always	Below 1 Ω
   A87-6 (E) - Body ground	Always	Below 1 Ω
   A89-6 (E) - Body ground	Always	Below 1 Ω
   Relay terminal 3 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  6

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the A87 headlight assembly LH connector.
2. Disconnect the A89 headlight assembly RH connector.
3. Measure the resistance according to the value(s) in the chart below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Relay terminal 3 - A87-1 (HI)	Always	Below 1 Ω
   Relay terminal 3 - A89-1 (HI)	Always	Below 1 Ω
   A87-6 (E) - Body ground	Always	Below 1 Ω
   A89-6 (E) - Body ground	Always	Below 1 Ω
   Relay terminal 3 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Disconnect the F15 main body ECU (Multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the chart below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Relay terminal 1 - F15-1 (DIM)	Always	Below 1 Ω
   Relay terminal 1- 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 [08/2020 - 12/2021]  , or refer to  REMOVAL [12/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR