Electrical - Complete Electrical System Power Failure

B07 02 11 - Procedure 2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) Technical Service Bulletin # 610811 Date: 110701

Electrical - Complete Electrical System Power Failure

SI B61 08 11

General Electrical Systems

July 2011

Technical Service

SUBJECT

Complete Power Failure of the Vehicle's Electrical System

MODEL

E82, E88 (1 Series)

E89 (Z4)

E90, E91, E92, E93 (3 Series)

Vehicles produced from 2/28/2007 to 5/30/2011

SITUATION

The vehicle electrical system fails completely and one or more of the following faults may occur:

^ The vehicle fails to start.

^ The central locking system fails to operate with the remote key.

^ The key cannot be inserted into the key slot.

^ Communication to the vehicle is not possible using ISTA (Integrated Technical Service Application).

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CAUSE

Over time, the positive battery cable connection at the front power distribution box loses connection.

PROCEDURE

The situation described in this Service Information can also be attributed to a discharged battery. Before proceeding with this procedure, check that

the battery is in operating condition by using the BMW battery tester.

1. Remove the front fuse box as per ISTA Repair Instructions REP 61 13 050, Removing and installing or replacing fuse box in passenger

compartment (built afier 3/2007).

2. Check for discoloration of the positive battery cable insulation where the cable connects to the fuse box. Refer to the attachment to this Service

Information bulletin, which shows the affected area.

3. If discoloration is noted in the affected area, replace both the fuse box and the cable. The cable routes from the battery fuse box in the luggage

compartment to the front fuse box along the main wiring harness, under the carpet on the right side of the vehicle interior. There are currently no

repair instructions to replace this cable. Refer to ISTA Repair Instructions REP 51 47 315 and 51 47 440 for removing all the carpets in order to gain

access to the harness. Route the new cable in the exact same way as the original cable. Refer to attachment.

REP 51 47 315 and 51 47 440 are for reference only, the full scope of these repair procedures do not apply (removing all seats and the center

console as applicable) to the repair procedure outlined in this Service Information bulletin.

Note:

The replacement cables listed in this Service Information have been improved to prevent this fault from occurring in the future.

Please take particular care in removing and installing the replacement B+ battery cable that is contained in the main harness to avoid damaging other

wiring.

4. If no discoloration is found on the cable insulation, proceed with standard troubleshooting to identify the voltage drop in the battery cable circuit.

PARTS INFORMATION

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2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 164

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 165

WARRANTY INFORMATION

ATTACHMENTS

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 166

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 167