Interior Lights malfunction

have a load test done on the battery as it appears that it has a faulty cell. 2 hours for an internal light to flatten the battery indicates that the battery is no good as an interior bulb draws around 5 watts and on a good battery that would amount to around 24 hours usage. Besides all the other problems indicate a lower than required voltage.

The first thing that comes to mind is that the dash lights scroll dimmer is scrolled all the way in one direction which manually shuts off all the interior lights, even if a door is opened. At night turn on the parking lamps and then scroll the dash lights dimmer until the dash, radio face, overhead console, etc is brighter. Turn off the headlamp switch. Shut off the engine and exit the vehicle. Interior lights on? Hope this helps.

The interior light module is not timing out. The possibility of the interior lights staying on could run your battery down over night. Replace the interior light module.

have you checked the fuzes ?

one of the door ajar switches are sticking. needs to be put on the computer to find out which one. only other way is to go around and unplug the switches until your light shuts off.

Below is the layout you requested:

PART COLOR LOCATION 12 VOLT CONSTANT RED (+) IGNITION SWITCH HARNESS STARTER YELLOW (+) IGNITION SWITCH HARNESS STARTER 2 N/A IGNITION 1 PINK (+) IGNITION SWITCH HARNESS IGNITION 2 N/A IGNITION SWITCH HARNESS IGNITION 3 N/A ACCESSORY/HEATER BLOWER 1 ORANGE (+) IGNITION SWITCH HARNESS ACCESSORY/HEATER BLOWER 2 N/A KEYSENSE N/A PARKING LIGHTS ( - ) LIGHT BLUE (-) @ HEADLIGHT SWITCH PARKING LIGHTS ( + ) PURPLE (+) or BROWN/WHITE (+) @ FUSE BOX POWER LOCK WHITE (TYPE B) @ BACK of FUSEBOX, ETACS, See NOTE *1 POWER UNLOCK LIGHT BLUE (TYPE B) @ BACK of FUSEBOX, ETACS, See NOTE *1 DOOR TRIGGER YELLOW (-) IN DRIVERS KICK PANEL or ETACS, See NOTE *1 DOMELIGHT SUPERVISION USE DOOR TRIGGER, Requires Part #775 Relay TRUNK RELEASE BLUE (+), Requires Part #775 Relay IN DRIVERS KICK PANEL SLIDING POWER DOOR N/A HORN YELLOW (-) @ STEERING COLUMN HARNESS TACH WHITE (-) @ ECM, See NOTE *2 WAIT TO START LIGHT N/A BRAKE LIGHT BLUE (+) @ SWITCH ABOVE BRAKE PEDAL

this sounds like a problem with the body control module. this era of these cars were common for these problems. have the vehicle scanned, hopefully that can shed some more light on the situation. this is a dealer item only.

passats are notourious for ground problems , check as many as you can find for loose , or coroded

You have a door adjar light sticking in one of the doors or deck lid.
Take you a can of WD40 open each door and spray it into the latch on the on the side of the doors then open and close it a few times,this will take car of the problem most of the time. Start with the driver door first it is usually the one.