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Battery in luggage compartment under spare wheel

WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.

Remove spare wheel.

Release screws.

CAUTION: Do not kink air pipes.
Fig 1: Identifying Air Supply System
G04748610Courtesy of BMW OF NORTH AMERICA, INC.

Set air supply system (1) to one side.

Follow instructions for disconnecting and connecting battery.

Disconnect battery negative lead.

Disconnect supply cable (1) for vehicle electrical system.

Installation: 

Remove faulty fuses and carry out troubleshooting.

Fig 2: Identifying Vehicle Electrical System Supply Cable
G04748611Courtesy of BMW OF NORTH AMERICA, INC.
CAUTION: Pay attention to interface.
The repair cable is always a standard length.
The heavy-current connector of the repair cable has a larger diameter than the battery positive lead.
In some Series (e.g. E46 touring), the heavy-current connector of the repair cable can lead to installation problems.
This is the case when the interface is in the area of the close-fitting trim panels.
Find matching interface (e.g. approx. 10 cm behind rear seat backrest in E46 touring).

Lay repair cable parallel to battery positive lead.

Mark interface of battery positive lead at end of repair cable.

Fig 3: Locating Interface Mark On Battery Positive Lead
G04748612Courtesy of BMW OF NORTH AMERICA, INC.

Release cable ties (1).

Disconnect plug connection (2).

Fig 4: Identifying Cable Ties And Plug Connection
G04748613Courtesy of BMW OF NORTH AMERICA, INC.
CAUTION: Do not use bolt cutters or similar tools to cut through the cable.
A cable end that has been squashed flat will no longer fit into the clamping sleeve.

Saw through battery positive cable at marked point with an iron saw.

Fig 5: Locating Cable End
G04748614Courtesy of BMW OF NORTH AMERICA, INC.

Strip insulation - length (A) - from cable end.

Distance (A) = 15 mm.

Fig 6: Identifying Strip Insulation Length Dimension
G04748615Courtesy of BMW OF NORTH AMERICA, INC.

Push heavy-current connector (1) over stripped cable end and screw into position.

Fig 7: Identifying Heavy-Current Connector
G04748616Courtesy of BMW OF NORTH AMERICA, INC.

Push shrink-fit hose (3) over repair cable.

Screw threaded sleeve (1) of repair cable (2) to heavy-current connector.

Fig 8: Identifying Shrink-Fit Hose And Threaded Sleeve Of Repair Cable
G04748617Courtesy of BMW OF NORTH AMERICA, INC.

Push shrink-fit hose (1) over connecting point and shrink on with a hot-air blower (2).

Fig 9: Pushing Shrink-Fit Hose Over Connecting Point
G04748618Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Heat up shrink-fit hose until it has settled completely around the connection point.
Fig 10: Locating Shrink-Fit Hose
G04748619Courtesy of BMW OF NORTH AMERICA, INC.

When laying the repaired battery positive cable, observe the following:

NOTE: Offsetting cutting line by approx. 10 cm produces excess length of battery positive lead (1).

Lay battery positive lead (1) without kinks or abrasions.


(Shown on E46 touring.)
Fig 11: Identifying Battery Positive Lead
G04748620Courtesy of BMW OF NORTH AMERICA, INC.
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