Daytime Running Light 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
   Daytime Running Light	Daytime running lights	OFF or ON	-

   Body Electrical > Main Body > Active Test 

   Tester Display
   Daytime Running Light

   OK

   Daytime running lights 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

1. Remove the DRL relay.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to DRL Relay)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   2 (DRL relay) - Body ground	Ignition switch off	11 to 14 V
   5 (DRL 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  3

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

Result

Result: 

NG 

REPLACE DRL RELAY 

Result: 

OK 

See step  4

1. Remove the DRL relay.
2. Disconnect the A55 headlight unit LH connector.
3. Disconnect the A54 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 (DRL relay) - A55-2 (B)	Always	Below 1 Ω
   3 (DRL relay) or A55-2 (B) - 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 DRL relay.
2. Disconnect the 4E power distribution box assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 (DRL relay) - 4E-3	Always	Below 1 Ω
   1 (DRL relay) or 4E-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. Remove the power distribution box assembly.

   Refer to REMOVAL [06/2020 - 12/2021]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Power Distribution Box Assembly)

   -

   -

2. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

   Refer to REMOVAL [06/2020 - 12/2021]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4E-3 - A-7 (DRL)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2020 - 12/2021] 

Result: 

NG 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [06/2020 - 12/2021]