Daytime Running Light Relay Circuit [09/2014 - 03/2019]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / AutoLeveling / Active Test.
5. Perform the Active Test according to the display on the Techstream.

   Body Electrical > HL AutoLeveling > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Clearance Light	Parking lights	ON or OFF	-
   Daytime Running Light	Daytime running lights	ON or OFF	-

   Body Electrical > HL AutoLeveling > Active Test 

   Tester Display
   Clearance Light

   Body Electrical > HL AutoLeveling > Active Test 

   Tester Display
   Daytime Running Light

   OK

   Parking lights and Daytime running lights illuminate.

   Result

   Result	Proceed to
   OK	A
   NG (for LH Side)	B
   NG (for RH Side)	C

Result: 

A 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [09/2014 - 03/2019] 

Result: 

C 

See step  5

Result: 

B 

See step  2

1. Disconnect the D4 clearance light assembly RH connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D4-3 (DRL) - Body ground	Light control switch in tail or head position	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D4-2 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the A3 headlight light control ECU sub-assembly LH connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A3-8 (RLD2) - D4-4 (DRLC)	Always	Below 1 Ω
   A3-8 (RLD2) - 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 clearance light assembly LH.

   Refer to REMOVAL [09/2014 - 03/2019]

2. Inspect the clearance light assembly LH.

   Refer to INSPECTION [09/2014 - 03/2019]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [09/2014 - 03/2019] 

Result: 

NG 

REPLACE CLEARANCE LIGHT ASSEMBLY LH. Refer to  REMOVAL [09/2014 - 03/2019] 

1. Disconnect the D2 clearance light assembly RH connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D2-3 (DRL) - Body ground	Light control switch in tail or head position	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D2-2 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Disconnect the A11 headlight light control ECU sub-assembly RH connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A11-8 (RLD2) - D2-4 (DRLC)	Always	Below 1 Ω
   A11-8 (RLD2) - 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 clearance light assembly RH.

   Refer to REMOVAL [09/2014 - 03/2019]

2. Inspect the clearance light assembly RH.

   Refer to INSPECTION [09/2014 - 03/2019]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [09/2014 - 03/2019] 

Result: 

NG 

REPLACE CLEARANCE LIGHT ASSEMBLY RH. Refer to  REMOVAL [09/2014 - 03/2019]