Battery Control Module needs replacement due to electrical overstress

Bulletin number

LI54.10-P-077909 (LI54.10-P-077909)

Component

Electrical system

Summary

Battery Control Module needs replacement due to electrical overstress. Incorrect charging procedures and battery maintenance. Remedy Proper care and maintenance of the electrical system of MY2003-2012 SL-Class. Please share the below excerpts from the Owner’s Manual and general guidance, cautions, and suggestions regarding battery charging and maintenance with customers. Guidance and Cautions : · Failure to follow these instructions can lead to severe injuries or death, damage to the vehicle or its electronic components, and/or cause a battery explosion. · Following extended periods of non-operation, Mercedes-Benz AG (MBAG) recommends the use of Mercedes-Benz approved battery chargers to ensure optimal battery maintenance and performance. Do not use a quick-charge unit (“jump box”) and avoid jump starting after extended periods of non-operation. FOR DEALERS: For comprehensive guidelines on battery charging, please refer to document AR54.10-P-1130I.· Charge vehicle batteries according to the instructions in the owner’s Manual. Dealers can also reference WIS document AR54.10-P-1130I. · If the battery needs to be removed, please follow the instructions in the owner’s manual and reinstall a new or charged battery in reverse order. · MY2003-2012 SL-Class vehicles are equipped with two 12V batteries. See owner’s manual. If both batteries are drained, never connect a charger to both batteries simultaneously. Jump Starting: · The starter battery is located on the right side of the engine compartment. Jump starting may only be performed on the battery installed in the engine compartment. Never use the auxiliary battery installed in the trunk to jump start the vehicle. · Do not attempt to start the engine using a battery quick-charge unit or battery charger/tender not approved by MBAG. · Only jump start from batteries with the same voltage rating (12V). Jump starting with a higher voltage battery could damage the vehicle’s electrical system. · Avoid repeated and/or lengthy starting attempts. This could result in damage to the vehicle or its electrical system, severe injuries, or death.

Owners of these vehicles have filed 33 complaints in the electrical category.