Headlight Relay Circuit

LIGHTING: LIGHTING SYSTEM: Headlight Relay Circuit
- Headlight Relay Circuit

DESCRIPTION

The headlight dimmer switch sends a signal to the main body ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (HEAD LIGHT)

(a) Connect the Techstream to DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the tester on.

(d) Enter the following menus: Body Electrical / Body / Active Test / Headlight Relay

(e) Check the headlight (Low-beam) while operating the headlight relay using the tester.

Body (Main Body ECU):





OK:

The headlight (low-beam) comes on when operating it through the Techstream.

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
NG -- Continue to next step.

2. INSPECT HEADLIGHT RELAY

(a) Remove the HEAD relay from the No. 2 engine room relay block.





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

Standard resistance:





(c) Reinstall the HEAD relay.

NG -- REPLACE HEADLIGHT RELAY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY)

(a) Remove the HEAD relay from the No. 2 engine room relay block.





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

Standard voltage:





(c) Reinstall the HEAD relay.

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

4. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - MAIN BODY ECU)

(a) Remove the HEAD relay from the No.2 engine room relay block.





(b) Disconnect the 1B main body ECU connector.

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

Standard resistance:





(d) Reinstall the HEAD relay.

(e) Reconnect the main body ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures