Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VKI0
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: LIGHTING (EXT): LIGHTING SYSTEM: Daytime Running Light Relay Circuit; 2016 MY Sienna [12/2015 - 08/2016]

Daytime Running Light Relay Circuit

DESCRIPTION

The main body ECU controls the daytime running lights.

HINT:

  • The running light relay has a headlight control function. This function dims the high beam headlights in accordance with operation signals from the main body ECU while the daytime running light system is operating*1.
  • The running light relay dims the high beam headlights using a duty control*1.
  • The main body ECU controls the LED DRL relay*2.
  • *1: for DRL Bulb Type
  • *2: for DRL LED Type

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CONFIRM VEHICLE TYPE

(a) Confirm vehicle type.

Result

Result

Proceed to

for DRL Blub Type

A

for DRL LED Type

B
B

GO TO STEP 6

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM (DAYTIME RUNNING LIGHT)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Check that the relay operates.

Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Daytime Running Light

Daytime running light relay

ON/OFF

-

OK:

Relay operates. (Daytime running lights illuminate.)

OK

REPLACE MAIN BODY ECU

NG

3.

CHECK HEADLIGHT

(a) Check the operation of the high beam headlights.

OK:

High beam headlights operate normally.

NG

GO TO PROBLEM SYMPTOMS TABLE

OK

4.

INSPECT RUNNING LIGHT RELAY

(a) Remove the running light relay from the engine room relay block.

(b) Connect a positive (+) lead from the battery to terminal 6 (+B).

(c) Connect a negative (-) lead from the battery to terminal 2 (DRLS).

(d) Check for pulses according to the value(s) in the table below.

OK:

Tester Connection

Condition

Specified Condition

1 (HLOR) - Battery negative

Always

Pulse generation

5 (HLOL) - Battery negative

Always

Pulse generation

Text in Illustration

*a

Component without harness connected

(Running Light Relay)
NG

REPLACE RUNNING LIGHT RELAY (DRL RELAY)
OK

5.

CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - INSTRUMENT PANEL JUNCTION BLOCK)

(a) Remove the running light relay from the engine room relay block assembly.

(b) Remove the instrument panel junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (DRLS) - D13-15 (DRL)

Always

Below 1 Ω

2 (DRLS) or D13-15 (DRL) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

PERFORM ACTIVE TEST USING TECHSTREAM (DAYTIME RUNNING LIGHT)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) According to the display on the Techstream, perform the Active Test.

Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Daytime Running Light

Running light relay

OFF or ON

-

OK:

Daytime running lights illuminate.

OK

REPLACE MAIN BODY ECU

NG

7.

INSPECT RUNNING LIGHT RELAY (LED DRL RELAY)

(a) Remove the running light relay (LED DRL relay).

(b) Inspect the running light relay (LED DRL relay) (See page 2016 MY Sienna [12/2015 - 08/2016]; LIGHTING (EXT): RELAY: ON-VEHICLE INSPECTION ).

NG

REPLACE RUNNING LIGHT RELAY (DRL RELAY)
OK

8.

CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - BATTERY)

(a) Remove the running light relay (LED DRL relay) from the engine room relay block.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

1 - Body ground

Always

11 to 14 V

3 - Body ground

Always

11 to 14 V

Text in Illustration

*1

Engine Room Relay Block

*2

Running Light Relay (LED DRL Relay) Holder
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - MAIN BODY ECU)

(a) Remove the running light relay (LED DRL relay) from the engine room relay block.

(b) Disconnect the D13 main body ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 - D13-15 (DRL)

Always

Below 1 Ω

2 or D13-15 (DRL) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR