12 42 510 Replacing Battery Positive Lead (Between Starter Motor And B+ Support Point) (S54)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW M3, 2005 BMW M3, 2004 BMW M3, 2003 BMW M3, and 2002 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

Read fault memory. Switch off ignition.

Observe safety instructions for handling vehicle battery. Refer to 61 00... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY .

Remove front underbody protection.

Observe instructions for disconnecting and connecting battery. Refer to 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .

Disconnect battery negative lead from battery and lay to one side.

Unclip battery positive lead from clips (1).

Feed battery positive lead out of cable duct.

Fig 1: View Of Battery Positive Lead Clips

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Fold back protective cap (1).

Release nut (2).

Installation:

Tightening torque, refer to 12 51 4AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Disconnect battery positive lead (3) from connection point.

Fig 2: Identifying Battery Positive Lead Connection Point

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Detach holder of battery positive lead on intake air manifold:

Gently raise lug (1) and slide holder upwards.

Fig 3: Raising Lug And Sliding Holder Upwards

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Remove reinforcement plate on front axle support.

CAUTION: The article DRIVE AXLE SHAFTS & SEAL (FRONT, ALL WHEEL DRIVE) contains important installation instructions.

NOTE: For a better overview, this work step is shown without the intake air manifold and from above. Carry out the work from below.

Release nut.

Installation:

Tightening torque, refer to 12 41 4AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Disconnect battery positive lead from starter motor.

Remove battery positive lead.

Fig 4: Disconnecting Battery Positive Lead From Starter Motor

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NOTE: Interrogate fault memory of DME control unit. Check stored fault messages. Rectify faults. Then clear fault memory.