Question about Toyota Corolla
If the unit is turning off when you turn the headlights on, check that you haven't used the illumination wire as ground.
The illumination wire will normally measure as 0V compared to chassis ground. When you turn the headlights on it will go to 12V compared to ground. With the headligts off, if you measure your constant power and switched power (aka 'Accessories') lines against the illumination wire you'll measure 12V and everything will seem alright. However, if you turn the headlights on and then measure again (now that the illumination wire has gone from 0V to 12V) you'll measure 0V, since the voltage difference between the 12V constant/switched power and the 12V illumination wire is zero - they are both now at the same voltage and no current will flow.
Once you find (or install) the correct ground wire and you should be right.
Posted on Dec 30, 2008
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
Mar 09, 2014 | 2005 Dodge Magnum
Dec 28, 2013 | Volkswagen Cars & Trucks
Jul 28, 2017 | 2001 Pontiac Bonneville
Mar 11, 2010 | Honda Accord Cars & Trucks
Dec 25, 2009 | 1999 Plymouth Breeze
Nov 28, 2008 | 2002 Buick Park Avenue
Aug 22, 2008 | 1990 Ford Taurus
Aug 04, 2008 | 1995 Pontiac Grand Prix
Jun 18, 2008 | 1996 Pontiac Grand Am
467 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: