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© 2008 Directed Electronics. All rights reserved.
Note: Many Toyotas and other Asian vehicles, send a (-) signal from the switch
to a relay. The relay then sends (+)12V to the bulbs. Whenever you have dif-
ficulty finding a (+) parking light wire near the switch, simply test the wires at any
switch or control panel that is lit by the instrument panel lighting. Remember, you
need a (+) parking light wire that does not vary with the dimmer setting.
How to find a (+) parking light flash wire with your multimeter:
Set to DCV or DC voltage (12V or 20V is fine).1.
Attach the (-) probe of the meter to chassis ground.2.
Probe the wire you suspect of being the parking light wire. Usually, the 3.
area near the headlight/park ing light switch is an excellent area to start,
as is the kick panel.
Turn on the parking lights. If your meter shows (+)12V, turn off the parking 4.
lights and make sure it goes back to zero.
If it does return to zero, turn the parking lights back on and, using the 5.
dash light dim mer con trol, turn the brightness of the dash lights up and
down. If the meter changes more than a volt when using the dimmer, look
for an oth er wire. If it stays relatively close to (+)12V, you have found your
parking light wire
Note: Vehicles that use a (-) signal from the switch to the factory relay may be
interfaced directly. (See H1/5 WHITE wire of Primary Harness (H1) Wire Con-
nection Guide section.)
➤ Tachometer wire
To test for a tachometer wire, a multimeter capable of testing AC voltage must