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. INSPECT RUNNING LIGHT RELAY (DRL)

(a) Remove the running light relay.





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

(c) Connect a negative (-) lead from the battery to terminals 2 (DRLS) and 3 (E).

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

Standard:





Text in Illustration





NG -- REPLACE RUNNING LIGHT RELAY (DRL)
OK -- Continue to next step.

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

(a) Remove the running light relay.

(b) Disconnect the 2C 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 (MULTIPLEX NETWORK BODY ECU) Service and Repair