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The third or High Mounted Brake Light runs straight off the brake light switch on the brake pedal arm. You say you tested the "brake unit"? I assume you mean the third brake light assembly, and if you get power there when someone steps on the brake pedal, then the bulbs are bad.
The power flow for the brake lights goes like this: Fuse ->Brake switch -> Turn signal switch -> Rear lights. The only difference is, if you have a 3rd brake light in your rear window, that gets its power directly from the brake switch. It does not go thru the signal switch first. So, if you are having a brake light problem, and your fuses are good, check the 3rd light in the rear window, if it lights up (assuming the bulbs are good, no one ever changes them), then the problem is most likely in the turn signal switch, hope this helps!
IF TURN SIGNAL LIGHT DONT WORK SOME TIMES.CHECK FOR BLOWED OR LOOSE FUSE.CHECK TURN SIGNAL BULBS AND CHECK BULB SOCKETS FOR CORROSION.CHECK TURN SIGNAL FOR BAD GROUND.USE JUMPER WIRE BETWEEN GROUND SIDE OF THE TURN SIGNAL BULBS AND A GOOD CHASIS GROUND.IF ALL IS GOOD TURN SIGNAL SWITCH IS BAD OR FLASHERS GOING BAD.TURN SIGNAL FLASHER LOCATED ON CENTER CONSOLE SIDE PANEL GRASP THE FLASHER UNIT AND DETACH IT FROM THE FUSE BOX.IF YOU HAVE EARLY MODEL VECHICLE FLASHER UNIT LOCATED AT THE FRONT OF THE FUSE BLOCK.
Check all turn signal bulbs, front and back, you probably have a blown bulb that is shorting the circuit. If all lights are ok, try removing them and installing one by one while circuit is energized, tif the fuse is blown on the first bulb try another location, his way you double check that the bulbs are not at fault. if it blows the fuse again, check your turn signal switch, it may be defective.
The bulbs on these cars can be delicate. Some get replaced every year or so-( headlights, tail and brake) and some I've never touched in 8 years (my front turn signals and marker lights)
The fast blinking occurance is normal when a turn signal bulb goes out.
The rear lights are common to blow, I keep spares in the glovebox.
Make sure you were given the correct bulb, check to see that it works and isn't defective. Also there is an empty spot in the rear bulb holder- make sure you didn't mistakenly pop a bulb in there cause' it won't work.
The front right signal light is in the right headlight housing. Open the hood and on the back of the housing there are two plastic caps. One is curved and one is rectangular- you want to take off the rectangular one.
Open the drivers door and on the side of the dash there's a cover. This is the main fuse block. Use a coin or carefully with a screwdriver pry it open. To check a fuse pull it out, noting exactly where it came from, and visually inspect it to see if it is blown.
Fuse # 2- turn signal system
Fuse #4- License plate lights
Fuse #7- back up lights
Fuse #13- brake lights
Fuse #22- parking and side marker lights, right
Fuse #23- parking and side marker lights, left
The turn signal flasher is integrated into the hazzard button in the center of the dash. If all else is good and you suspect the flasher is bad, which is a good possibility, call a VW dealer and have them run your VIN# to check for recalls. The hazzard switch for some cars around your year had a recall on em'.
If it is just one light it is more likely the bulb than a fuse. A fuse would cause everything on a circuit to fail so none of the bulbs would come on. If the bulbs are all good check the wiring. Check the bulbs by having someone depress the pedal so you can see what lights. Also turn on the parking lights or headlights and activate the turn signals to verify proper operation of all bulbs. Some of the bulbs have more than one function so that if one thing operates it but something else doesn't it could be more involved. But start with the simple - check the bulbs.
CHECK TURN SIGNAL FUSE.IF FUSE IS GOOD.TURN SIGNAL IS BAD.IF FUSE IS BLOWN.FIND SOURCE OF THE PROBLEM.BEFORE REPLACING THE FUSE.FOR THE DAY TIME LIGHTS.YOUR LIGHT BULBS IS HALOGEN.WHEN REPLACING THEM YOU HAVE TO WEAR CLEAN GLOVES FREE FROM OIL GREASE OR DIRT.BECAUSE THE BULBS WILL OVER HEAT AND BLOW.YOU CANT TOUCH BULB WITH HANDS.YOUR HAND HAVE OIL IN PORES.SO YOU HAVE TO WEAR CLEAN NEW GLOVES WHEN HANDLING BULBS.
replace the rear bulb it flashs fast to let you know the bulb is bad, whatever bulb is not flashing thats the bad bulb, should be a 1157 bulb or a 1156 if it has one contact it's a 1156 if two it's a 1157
The way the system works is:
The fuse supplies 12 volts to the flasher unit then leaves the flasher and goes to the turn-signal switch in the steering column.
When you set the turn-signal switch to turn right or left, the switch sends that 12 volts to the front and rear bulbs. The voltage goes through the bulb, lighting the bulb and goes to ground.
If any of these components are not good than the lights will not work.
Check the fuse and make sure it is good, the fuse will be located under the hood at the fuse center.
Let me know if you have a test light and we can proceed from there.