High Beam Headlight Circuit [06/2020 - 12/2021]: Procedure

1. Perform the Active Test according to the display on the GTS.

   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 [06/2020 - 12/2021] 

Result: 

NG 

See step  2

Refer to ON-VEHICLE INSPECTION [06/2020 - ]

Result

Result: 

NG 

REPLACE DIM RELAY 

Result: 

OK 

See step  3

1. Remove the DIM relay.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to 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  4

1. Remove the DIM relay.
2. Disconnect the A62 headlight unit LH connector.
3. Disconnect the A61 headlight unit 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  5

1. Remove the DIM relay.
2. Disconnect the G139 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) - G139-22 (DIM)	Always	Below 1 Ω
   1 (DIM relay) or G139-22 (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 [06/2020 - 12/2021] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR