Headlight Relay Circuit

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

DESCRIPTION

The front controller controls the HEAD relay when a signal is received from the headlight dimmer switch assembly.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Body No. 5 / Active Test.

(e) Check the operation.

Body No.5 (Front Controller)





OK:

Headlights come on.

NG -- INSPECT RELAY

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT RELAY

(a) Remove the HEAD relay from the engine room R/B & J/B.





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

Standard resistance:





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

3. CHECK HARNESS AND CONNECTOR (BATTERY - FRONT CONTROLLER)

(a) Disconnect the 1H connector from the front controller.

(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 (HEAD RELAY - BODY GROUND)

(a) Using a service wire, connect the 1H-3 on the wire harness side and body ground.

OK:

Headlight comes on.





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE