Manual: 2009-2012

Page: 245

Emergency Starting with Jumper Cables
If the battery is discharged, e.g. in winter or after the car has been parked for a long time, the battery of another car can be used for starting with the help of jumper cables.

Make sure the voltage of both batteries is the same. Both batteries must be 12 volt types.

The capacity (Ampere hours, Ah) of the booster battery must not be substantially less than that of the discharged battery.

The discharged battery must be correctly connected to the vehicle's electrical system.

  • Please see the chapter "BATTERY" on page 239.


  • Do not try to start the car by pushing or towing. Damage to the catalytic converters and other components of the car may result.

Risk of short circuit, damage and explosion, resulting in serious personal injury or death.

  • Use only jumper cables of adequate diameter cross-section and fitted with completely insulated alligator clips.
  • Follow all warnings and instructions of the jumper cable manufacturer.
  • When connecting jumper cables, make sure that they cannot get caught in any moving parts in the engine compartment.
    The jumper cables must be long enough so that neither vehicles nor cables touch another.
  • The vehicles must not be in contact, otherwise current might flow as soon as the positive terminals are connected.
  • The cable clamps must not be allowed to contact each other when one end of the jumper cables are connected to a battery.
  • Ensure that tools or conductive jewelery (rings, chains, watch straps) do not come into contact with the positive jumper cable or the positive battery post.
  • Improper hook-up of jumper cables can ruin the alternator.

Danger of caustic burns from escaping acid.

  • Do not lean over the battery.

Danger of gas explosion.

  • Improper use of booster battery to start a vehicle may cause an explosion, resulting in serious personal injury or death.
  • Keep sources of ignition away from the battery, e.g. open flame, burning cigarettes or sparking due to cable contact or welding work.
  • A discharged battery can freeze even at 23 °F/ –5 °C.
    Before connecting jumper cables, a frozen battery must be thawed out.