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Home >> BMW >> 2009 >> M3 2D Convertible, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 73 (Engine Electrical System - Repair - E90) >> Starter Lead >> 12 42 510 Replacing battery positive lead (between starter and B+ terminal) (S65)

12 42 510 Replacing battery positive lead (between starter and B+ terminal) (S65)

WARNING: This page is about a different variant/trim than selected.

Read fault memory. Switch off ignition 

Observe SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY .

OBSERVE INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY  .

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

Necessary preliminary tasks 

REMOVE INTAKE AIR MANIFOLD .

Release and raise cable duct for engine wiring harness; refer to REMOVING ENGINE WIRING HARNESS 

Release nut (2) on B+ lead.

Remove B+ leads.

Installation: 

Tightening torque, 12 41 1AZ

Fig 1: Identifying Nut
G06203516Courtesy of BMW OF NORTH AMERICA, INC.

Release clamp for B+ lead on cylinder no. 4.

Unclip lead from cable holders.

Fig 2: Unclipping Lead From Cable Holders
G06203522Courtesy of BMW OF NORTH AMERICA, INC.

Remove cover from B+ terminal. Unfasten nut. Remove B+ lead.

Installation: 

Tightening torque, 12 42 1AZ

Fig 3: Identifying Battery Positive Lead On Battery Positive Terminal
G04751340Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Assemble engine.

Interrogate fault memory of DME control unit.

Check stored fault messages.

Rectify faults and clear fault memory.