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They are turned on by the BCM !
Park, Tail, Marker and License Lamps
The park, tail, license, and marker lamps are turned ON when the headlamp switch is placed in either the HEAD or PARK lamp positions, or anytime the automatic light control (ALC) turns the headlamps ON. When the headlamp switch is placed in the park lamp or headlamp positions, ground from G202 is applied through the signal circuit to the BCM indicating the park lamp request. In response to this signal, the BCM applies ground through the park lamp relay control circuit energizing the PARK LP PCB Relay. With the relay energized, battery voltage is applied through the switch side of the relay, both park lamp fuses, and the supply voltage circuits illuminating the park, tail marker, and license lamps. Ground for the left front park and marker lamps is provided at G101 and the right front park and marker lamps at G100. Ground for all rear lamps is provided at G302.
Turn Signal Lamps
The LT T/SIG and RT T/SIG fuses located in the underhood fuse block supplies battery positive voltage to the body control module (BCM) for turn signal and hazard lamp operation. When the turn signal switch is place in either the LEFT or RIGHT position, ground from G202 is applied through the turn signal switch signal circuit to the BCM indicating the turn signal request. In response to this signal, the BCM applies a pulsating voltage to the front and rear turn signal lamps supply voltage circuits cycling the lamps ON and OFF. The BCM also sends a message via GMLAN to the instrument panel cluster (IPC) to cycle the turn signal indicator ON and OFF depending on the position of the turn signal switch.
Ground for the turn signal lamps is supplied as follows:
G101 provides ground for the left front turn signal lamp
G100 provides ground for the right front turn signal lamp
G302 provides ground for the left and right rear turn signal lamps
Check fuse's #19 ,# 6 #4 check grounds 105 & 107
G107 In the left rear of the engine block next to the knock sensor. G105 In the thermostat housing
The park, tail, marker and license lamps are turned on when the headlamp switch is placed in the PARK or ON position or anytime the headlights are requested. The PK LPS fuse in the IP fuse block supplies battery positive voltage to the park lamp relay and the headlamp switch. The body control module (BCM) provides a ground, or control circuit, to the park lamp relay coil circuit during ALC operation. When the park lamps are turned on during ALC, the BCM energizes the park lamp relay. The park lamps can also be supplied battery positive voltage directly from the headlamp switch. Current flow is to the park, tail, marker and license lamps. The front park and marker lamps are grounded at G100 and G101. The rear park, tail, marker and license lamps are grounded at G400 and G401. If the headlight switch is left in the ON position, the park, tail and marker lamps will remain on until turned off or the battery runs dead.
Check the headlamp switch !
No such thing , tail lights get power from headlamp switch . When you turn on park or head lamps . tail lights light up . License plate lights come on as well as side marker lamps . Unless you thing of the turn signals an hazard lights . There is a flasher relay for that .
At the left lower instrument panel, near the steering column
Guessed it's a V6. Trying to sort this out. If setting the headlamp switch to PARK turns on the park filaments of the front park/turn signal lamp and the tail filaments of the rear tail/stop lamps and the separate tail lamps, the park light circuit is good. If 20A fuse 6 in the power distribution center is OK, the combination flasher in the multifunction switch is receiving power. Power is directed to the turn signal lamps by operation of the turn signal/hazard warning switch. If the turn signals are not flashing, the combination switch may have failed or the turn signal flasher part of the combination flasher may have failed. Finally, the hazard warning switch causes the turn signal elements of the front combination park/turn signal lamps and the rear turn lamps to flash.
Do you know what a wiring diagram is ? How to use a DVOM - digital volt ohm meter ? Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year make ,model and engine size. Under system click on lighting ,then under subsystem click on turn signals . Click the search button then the blue links .Check power an ground circuits ! This is how we diagnose electrical faults , not just replacing parts .
Voltage is applied through the TURN fuse and the turn/hazard flasher when the ignition switch is in the following positions:
• BULB TEST
The voltage travels to the contact in the hazard switch. The hazard switch is located in the turn/hazard-headlamp switch assembly. This contact is normally closed.
When the left turn signal is turned on, voltage is applied to the following components.
• The left turn indicator
• The left front park/turn lamp circuit 14
• The left rear turn lamp circuit 18
The turn lamps turn on immediately. The current flow heats up the timing element. The timing element is located in the turn/hazard flasher. The timing element repeatedly opens and closes the circuit. This action causes the turn lamps to begin flashing.
The voltage that is applied to the left front park/turn lamp is also applied to the left front marker lamp. If the headlamp switch is in the OFF position, the left front marker lamp will find a path to ground through one of the following lamps. The following lamps provide low resistance paths to ground:
• The right front marker lamp
• The right turn indicator
• The right front park/turn lamps
• The left front park/turn lamps
The left front marker lamp flashes with the turn lamps. The voltage drop across the marker lamp is much higher than the voltage drop across the other lamps. The lamps that are used for the ground path will not flash.
When the headlamp switch is in either the PARK or HEAD positions, voltage is applied through the following components:
• The EXT LP fuse
• The marker lamps
• The park lamps
When the left turn signal is turned on, the left marker lamp will have voltage at both connections. The left marker lamp does not light. When the turn/hazard flasher stops the voltage to the turn lamps, the marker lamp is grounded through the turn lamp. The marker lamp does not go on. The left front marker lamp flashes in the following manner:
• The left front marker lamp flashes on when the turn filament of the left front park/turn lamp goes off.
• The left front marker lamp flashes off when the turn filament of the left front park/turn lamp goes on.
Voltage is applied to the right lamps in the same manner, when the right turn signal is turned on.
Voltage is applied at all times through the following components to the normally open contact of the hazard switch in the turn/hazard-headlamp switch assembly:
• The STOP HAZ fuse
• The turn/hazard flasher
When the hazard switch is turned on, voltage is applied to the following components:
• The front turn lamps
• The rear turn lamps
The following lamps flash on and off:
• All of the turn lamps
• Both of the turn indicators
The front marker lamps flash with the hazard lamps on, just as the front marker lamps flash when the turn lamps are on. If the headlamp switch is in the OFF position, the front marker lamps flash on when the hazard lamps are on. The front marker lights will flash on when the hazard lamps are on if the headlamp switch is in one of the following positions:
When the hazard lamps are on, the following conditions apply:
• The turn circuit is always open.
• The turn/hazard flasher controls the lamp.
Voltage is applied through the EXT LP fuse, to the headlamp switch at all times. Voltage is applied to the park lamps and the marker lamps when the headlamp switch is in the following positions:
The front marker lamps are grounded through the turn filament of the respective front park/turn lamp. The front marker lamps light as a result.
Voltage is applied through the STOP HAZ fuse to the brake switch at all times. When the brake pedal is depressed, the brake switch closes. This action applies voltage through the turn/hazard-headlamp switch assembly to the following lamps:
• The high mounted stop lamp assembly
• The left tail/stop-turn lamps
• The right tail/stop-turn lamps
could be the tail lite housing. or the ground on the frame rail back near that location. remove the assembly till its hanging by its wires and remove the bulb. using a test lite probe the socket with the flasher on see if it blinks. if not go down under the rear of the truck and unplug the connector for both tail lites and do the same probe each connector on the harness that goes forward till your test lite starts to blink if it does there then the tail lite assembly is bad if not then repost and ill lead you further
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'.
Have you tried replacing the flasher? You'd think neither side would blink if the flasher was bad but I've seen this happen and it turned out to be the flasher. You could swap the signal flasher with the 4 way flasher to verify that's the problem before going out and buying one. Should be a few bucks at the parts store.