Headlight Relay Circuit

The main body ECU receives headlight dimmer switch information signals, and illuminates the low beam headlight.

NOTICE:

Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.

1. PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT RELAY)

(a) Using the Techstream, perform the Active Test (See page ).

OK:

Headlight relay operates (low beam headlights illuminate).

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

1. INSPECT HEADLIGHT RELAY (H-LP LO)

(a) Remove the headlight relay from the engine room relay block, junction block.

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

Standard Resistance:

NG

REPLACE HEADLIGHT RELAY

OK

1. CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY [H-LP LO])

(a) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Condition Specified Condition Headlight relay terminal 1 - Body ground Always 11 to 14 V Headlight relay terminal 5 - Body ground Text in Illustration *a Front view of wire harness connector (to Headlight Relay)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO] - MAIN BODY ECU)

(a) Remove the main body ECU (See page ).

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

Standard Resistance:

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR