2008 VOLKSWAGEN PASSAT battery nut

Preparation for the anti-theft alarm system
If the vehicle is pre-equipped for installation of the anti-theft alarm system, the alarm system can be retrofitted by an authorized Volkswagen dealer or an authorized Volkswagen Service Facility.
The anti-theft alarm system makes it more difficult for someone to break into or steal the vehicle.
The anti-theft alarm system is automatically activated when the vehicle is locked by pressing the lock button on the remote control vehicle key.
When is the alarm triggered?
The anti-theft alarm system sounds for about 30 seconds and the turn signals flash for up to 5 minutes if the following occurs with respect to the locked vehicle:
x Opening a door that has been mechanically unlocked without switching on the ignition within about 15 seconds.
x Forcibly opening a door.
x Forcibly opening the engine hood.
x Forcibly opening the luggage compartment lid.
x Switching on the ignition with an invalid key.
x Disconnecting the vehicle battery.
Deactivating the alarm
Unlock the vehicle with the unlock button on the remote control vehicle key and switch on the ignition with a valid vehicle key.
For vehicles with Keyless Access, the alarm can be deactivated by grasping one of the door handles when a valid remote control vehicle key is in range or by holding the remote control vehicle key to the right of the steering column trim and pressing the starter button, Unlocking and locking vehicles with Keyless Access.
After the alarm has stopped and the vehicle is opened again in the same or a different area that is protected by the alarm, the alarm is triggered again. For example, the alarm will sound again if the luggage compartment lid is opened after one of the doors has been opened.
The anti-theft alarm system is not activated when the vehicle is locked with the power lock switch 1 on the inside of the driver or front passenger doors.
If the driver door is mechanically unlocked using the vehicle key bit, only the driver door is unlocked, but not the entire vehicle. Switching on the ignition deactivates the anti-theft alarm system and activates the central locking button. To unlock the doors, use the central locking button or remote control vehicle key.
If the vehicle battery is dead or weak, the anti-theft alarm system will not work properly.

x Preparations for working in the engine compartment
x Parts, accessories, repairs and modifications
WARNING
Working on the batteries or the electrical system in your vehicle can cause serious acid burns, fires, explosions, or electrical shocks. Always read and heed the following WARNINGS and safety precautions before working on the batteries or the electrical system.
x Before working on the electrical system, always switch off the ignition and all electrical consumers and disconnect the negative (-) cable from the standard 12 Volt battery.
x When you change a light bulb, always switch off the light first.
x Always keep children away from battery acid and vehicle batteries in general.
x Always wear eye protection. Never let battery acid or lead particles come into contact with your eyes, skin, or clothing.
x Sulfuric battery acid is very corrosive. It can burn unprotected skin and cause blindness. Always wear protective gloves and eye protection. To reduce your risk of injury, never tilt the batteries, as this could spill acid through the vents and burn you.
x If you get battery acid in your eyes or on your skin, immediately rinse with cold water for several minutes and then get immediate medical attention. If you swallow any battery acid, get medical attention immediately.
x When disconnecting the batteries from the vehicle electrical system, always disconnect the negative cable (-) first and then the positive cable (+).
x Always switch off all electrical consumers before reconnecting 12 Volt batteries. Reconnect the plus cable (+) first and then the negative cable (-). Never reverse the polarity of the connections. This could cause a fire.
x A highly explosive mixture of gases is given off when the battery is being charged.
x Do not smoke and avoid fires, sparks, and open flames when working. Never create sparks or electrostatic charges when handling cables and electrical equipment. Never short circuit the battery terminals. High-energy sparks can cause serious personal injury.
x Never use or attempt to charge a damaged or frozen battery, or a battery that was frozen but has thawed. Charging a frozen or thawed battery could cause explosions and chemical burns! Replace damaged or frozen vehicle batteries immediately. A dead battery can freeze at temperatures around +32 °F (0 °C).
x If the battery has a vent line or tube, make sure that it is properly connected to the battery.
x Always make sure that the vent line is securely attached to a vehicle battery that is located in the luggage compartment.
WARNING
California Proposition 65 Warning
x Battery posts, terminals, and related accessories contain lead and lead components, chemicals known to the State of California to cause cancer and reproductive harm. Wash your hands after handling.
NOTICE
x Do not expose the vehicle battery to direct sunlight for an extended period of time as ultraviolet rays may damage the battery housing.
x If the vehicle is left standing in the cold for a long time, protect the vehicle battery from freezing. A battery will be permanently damaged by freezing.

Checking the vehicle battery acid level
x If the lighting conditions are poor, use a flashlight so that you can clearly see the battery acid level indicator and tell what color it is. Never use an open flame or an unprotected light source.
x The round battery window (“acid level indicator”) on the top of the battery changes color, depending on the battery's electrolyte level.

Color indication Action
Light yellow or colorless Battery electrolyte level is too low. The vehicle battery may need to be replaced. Have it checked by an authorized Volkswagen dealer or an authorized Volkswagen Service Facility.
Black Battery electrolyte level is satisfactory.
WARNING
Working on the batteries can cause serious acid burns, explosion, or electrical shock.
x Always wear eye protection and protective gloves.
x Sulfuric battery acid is very corrosive. It can burn unprotected skin and cause blindness. Always wear protective gloves and eye protection.
x Never tilt the vehicle battery. Acid could spill out of the battery vents and burn you.
x Never open a vehicle battery.
x If you get battery acid in your eyes or on your skin, immediately rinse with cold water for several minutes and then get immediate medical attention.
x If you swallow any battery acid, get medical attention immediately.
Charging, replacing, disconnecting and connecting the vehicle battery

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Starting the engine
x Start the engine of the vehicle with the good battery that is providing help and let it run at idle speed.
x Turn on the ignition of the vehicle with the dead battery. If the engine starts, wait 2 to 3 minutes
until it “runs smoothly” before removing the jumper cables as described below ⇒ . If the engine does not start within about 10 seconds, turn off the ignition and wait at least 1 minute; then try again.
Before removing the jumper cables
(1) Switch off the headlights (if they are on).
(2) In the vehicle with the dead battery, switch on the heater fan and the rear window defroster. This helps to minimize voltage spikes when the cables are disconnected.
Removing the jumper cables
With the engine running, remove the jumper cables in reverse order to the way they were connected.
(1) Disconnect the black (-) cable from the vehicle with the dead battery.
(2) Disconnect the black (-) cable from the other vehicle (vehicle with the good battery).
(3) Disconnect the red (+) cable from the other vehicle (vehicle with the good battery).
(4) Disconnect the red (+) cable from the vehicle with the dead battery.
(5) Close the battery cover or snap shut the cap on the positive jump-start terminal9, as the case may be.