Daytime Running Light Relay Circuit

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

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the daytime running lights.

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 power switch on (IG).

(c) Turn the Techstream on.

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

(e) Check that the daytime running lights operate.

Main Body





OK:

Daytime running lights illuminate.

NG -- CHECK OPERATION (HIGH BEAM HEADLIGHTS)

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

2. CHECK OPERATION (HIGH BEAM HEADLIGHTS)

(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. CHECK HARNESS AND CONNECTOR (H-LP HI MAIN FUSE - RUNNING LIGHT RELAY (DRL))

(a) Disconnect the running light relay (DRL) connector.

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

Standard Voltage:





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

4. CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY (DRL) - INSTRUMENT PANEL JUNCTION BLOCK AND BODY GROUND)

(a) Disconnect the 2C instrument panel junction block assembly connector.

(b) 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 Removal.





(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 Removal
OK -- Continue to next step.

6. REPLACE RUNNING LIGHT RELAY (DRL)

(a) Temporarily replace the running light relay (DRL) with a new or normally functioning one.

(b) Check that the daytime running lights operate normally.

OK:

The daytime running lights operate normally.

NG -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal

OK -- END (RUNNING LIGHT RELAY WAS DEFECTIVE)