S 550 (221.171) V8-5.5L (273.961) (2007)
Power Distribution Module: All Technical Service Bulletins
Electrical - Battery Service Required Mssg/DTC 901b/901D
Date: March 25, 2008
Order No.: P-B-54.10/195
Supersedes:
Group: 54
SUBJECT:
Model 221.171/176/179, Up to VIN A086500
Message in Instrument Cluster "Battery - Service Required"
If you receive customer reports in the above model vehicles with the following symptoms, this may be due to the software in the Vehicle Power Supply
control module (BNS).
^
"Battery - Service Required" illuminated in red in the instrument cluster multifunction display
^
Fault code 901B, Component Internal charge transformer does not switch off", or fault code 901D, Component internal charge transformer fails to
switch on," stored in the BNS
Note:
If this message occurs in the instrument cluster display, it is for informational purposes only and does not impair the on-board electrical system.
To remedy, please flash the BNS via Star Diagnosis menu path: Control units --> Body --> BNS - Vehicle power supply module --> Control unit
adaptations --> Control module programming.
Note:
Replacement of the control unit is not necessary
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on
March 25, 2008. Please refer to Netstar --> Star TekInfo --> Star Time for the most current labor time allowance.
In Case of Warranty, use the table.