Daytime Running Light Relay Circuit

LIGHTING (EXT): LIGHTING SYSTEM: Daytime Running Light Relay Circuit
- Daytime Running Light Relay Circuit

DESCRIPTION

The main body ECU controls the daytime running lights (dimmed high beam headlights).

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.
* The running light relay dims the high beam headlights using a duty control.

WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(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





OK:

Relay operates. (Daytime running lights illuminate.)

NG -- CHECK HEADLIGHT

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Exterior Lighting System

2. CHECK HEADLIGHT

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

OK:

High beam headlights operate normally.

NG -- GO TO PROBLEM SYMPTOMS TABLE Exterior Lighting System
OK -- Continue to next step.

3. 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:





Text in Illustration





NG -- REPLACE RUNNING LIGHT RELAY Removal
OK -- Continue to next step.

4. 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) Disconnect the 2F instrument panel junction block assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

OK -- REPLACE MAIN BODY ECU Removal