Clarion Ungo Pro Security SR1000, Installation Manual

Page: 12 / 55

12
4. Turn the ignition switch to the ON position.
5. If the meter indicates 12 volts until the light goes out you have isolated the correct wire and the
wire's polarity is negative (ground while the bulb is on).
6. If the meter reads zero volts until the light goes out and then reads 12 volts, you have isolated
the correct wire and the wire's polarity is positive.
finding a (+) parking light wire
The (+) parking light wire is often found near the switch. Many cars have the switch built into the
turn signal lever, and in these cars the parking light wire can be found in the steering column. The
same wire is often available in the kick panel or running board.
N NO OTTEE:: Many Toyotas, as well as many other Asian vehicles, send a (-) signal from the switch to a relay. The
relay then sends (+)12V to the bulbs. Whenever you have difficulty finding a (+) parking light wire near the
switch, simply test the wires at any switch or control panel which 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:
1. Set to DCV or DC voltage (12V or 20V is fine).
2. Attach the (-) probe of the meter to chassis ground.
3. Probe the wire you suspect of being the parking light wire. Usually, the area near the head-
light/parking light switch is an excellent area to start, as is the kick panel.
4. Turn on the parking lights. If your meter shows (+)12V, turn off the parking lights and make sure
it goes back to zero.
5. If it does return to zero, turn the parking lights back on and, using the dash light dimmer 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 another wire. If it stays relatively close to (+)12V, you have found
your parking light wire.
finding the door pin switch circuit
The best places to find the door switch wire are:
●
At the pin switch: When testing at the pin switch, check the wire to ensure that it “sees” all the
doors. Often, the passenger switch will cover all the doors even if the driver’s switch will not.
●
At the dome light: This may not be your best choice if the vehicle has delayed domelight supervision,
but it will work in many Hondas, or any vehicle with completely diode-isolated pin switches.