High Beam Headlight Circuit [11/2024 - ]: 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. 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
   High Beam Headlight	High beam headlights	OFF or ON	-

   Body Electrical > Main Body > Active Test 

   Tester Display
   High Beam Headlight

   OK

   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 [12/2021 - ]

Result: 

NG 

See step  2

1. Check the vehicle type.

   Result

   Result	Proceed to
   for Triple Beam Headlight	A
   for Single Beam Headlight	B

Result: 

B 

See step  7

Result: 

A 

See step  3

1. Remove the DIM relay.
2. Disconnect the A62 headlight assembly LH connector.
3. Disconnect the A61 headlight assembly RH connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 (DIM relay) - A62-4 (HI)	Always	Below 1 Ω
   3 (DIM relay) or A62-4 (HI) - Body ground	Always	10 kΩ or higher
   3 (DIM relay) or A61-4 (HI) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the DIM relay.
2. Inspect the DIM relay.

   Refer to ON-VEHICLE INSPECTION [02/2019 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE DIM RELAY 

Result: 

OK 

See step  5

1. Remove the DIM relay.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   2 (DIM relay) - Body ground	Ignition switch off	11 to 14 V
   5 (DIM relay) - Body ground	Ignition switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Remove the DIM relay.
2. Disconnect the G44 main body ECU (multiplex network body ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 (DIM relay) - G44-13 (DIM)	Always	Below 1 Ω
   1 (DIM relay) or G44-13 (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 [10/2023 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. *1: Turn Light for LED Type
2. *2: Turn Light for Bulb Type

1. Remove the DIM relay.
2. Disconnect the A98*1 or A99*2 headlight assembly LH connector.
3. Disconnect the A96*1 or A97*2 headlight assembly RH connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   TURN LIGHT FOR LED TYPE
   
   

   Tester Connection	Condition	Specified Condition
   3 (DIM relay) - A98-6 (HI)	Always	Below 1 Ω
   3 (DIM relay) or A98-6 (HI) - Body ground	Always	10 kΩ or higher

   TURN LIGHT FOR BULB TYPE
   
   

   Tester Connection	Condition	Specified Condition
   3 (DIM relay) - A99-5 (HI)	Always	Below 1 Ω
   3 (DIM relay) or A99-5 (HI) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  4

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR