Electrical - Battery Charging During Repair Work

Date: August 18, 2006

Order No.: P-B-54.10/176

Supersedes:

Group: 54

SUBJECT:
Model 221.171/176

Notes on Power Consumption and Charging of Battery

If you receive customer reports in the above model vehicles of disabled convenience functions or partially discharged batteries after a workshop visit or after work with the ignition switched on and the engine off, the following notes should be adhered to.

The power requirement of model series 221 with the ignition on is higher than in predecessor models. When the ignition and telematics systems are on and depending on the vehicle equipment, the power requirement can be up to 30 A. Therefore it is absolutely essential to connect a battery charger during workshop visits, as described under "Remedy".

Note:
The functioning of the 2-battery on-board electrical system in model series 221, including deactivation stages is explained in WIS document GF54.10-P-0001SX.

During workshop visits, especially with the ignition on, due to the high power requirement it is essential to connect a battery charger. When charging the batteries via the prefuse box on the right in the engine compartment, a charger must be used that delivers a voltage of at least 13.5 V and a current of at least 30 Amps. The procedure for charging the two batteries is described in WIS document AR54.10-P-1130SX.

Note:
A link to the MBUSA approved chargers can be found on the Internet at the following address: STAR TekInfo --> MB Equipment --> SSEP Catalog.