Daytime Running Light Relay Circuit [02/2017 - 09/2019]: Procedure

1. Check the operation of the clearance lights.

   OK

   The clearance lights operate normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [02/2017 - 10/2017]  , or refer to  PROBLEM SYMPTOMS TABLE [10/2017 - 09/2019] 

Result: 

OK 

See step  2

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
   Daytime Running Light	Daytime running lights	ON or OFF	-

   Body Electrical > Main Body > Active Test 

   Tester Display
   Daytime Running Light

   OK

   The 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 [02/2017 - 10/2017]  , or refer to  PROBLEM SYMPTOMS TABLE [10/2017 - 09/2019] 

Result: 

NG 

See step  3

1. Remove the No. 1 integration relay from the No. 1 engine room relay block.

   Refer to REMOVAL [02/2017 - 08/2020]

2. Inspect the No. 1 integration relay.

   Refer to INSPECTION [02/2017 - ]

   OK

   No. 1 integration relay is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [02/2017 - 08/2020] 

Result: 

OK 

See step  4

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   1B-9 - Body ground	Always	11 to 14 V
   1B-11 - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Disconnect the A11 headlight assembly LH connector.
2. Disconnect the A29 headlight assembly RH connector.
3. Measure the resistance according to the value(s) in the chart below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1B-10 - A11-2 (B)	Always	Below 1 Ω
   1B-10 - A29-2 (B)	Always	Below 1 Ω
   1B-10 - 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 3F instrument panel junction block assembly connector.
2. Measure the resistance according to the value(s) in the chart below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1B-12 - 3F-28	Always	Below 1 Ω
   1B-12 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [02/2017 - 10/2017] , or refer to REMOVAL [10/2017 - 08/2020]

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the chart below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3F-28 - MB-25 (DRLE)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [02/2017 - 10/2017]  , or refer to  REMOVAL [10/2017 - 08/2020] 

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [02/2017 - 10/2017]  , or refer to  REMOVAL [10/2017 - 08/2020]