Error message in instrument cluster in red lettering at high outside temperatures and faults codes 9050 and 9051 are stored in the battery control unit - AF54.10-P-8030A

MODEL 211.### ## up to 350386

Operation no. of operation texts or standard texts and flat rates

OPERATION NO. OF OPERATION TEXTS OR STANDARD TEXTS AND FLAT RATES

Category	Op. no.	Operation text	Time	Acc. no.	Code
P	541011	Perform quick test	004 WU	-	-
P	542300	Replace control unit for on-board electrical system (after testing), MODEL 211.0	009 WU	-	-
P	542300	Replace control unit for on-board electrical system (after testing), MODEL 211.2	012 WU	-	-

Damage code	Cause	Remedy
54 849 73	Battery control unit (BSG)	1 Check Q-status and part number of battery control unit (BSG).
	At high temperatures (more than 50°C) in the spare wheel well, unstable conditions can occur for the battery control unit (BSG).	As of VIN end no. 350387 temperature tested battery control units with a software release of Q1
	The BSG cannot display any voltage or current values in these conditions.	(A 211 540 27 45) and with a white HT stamp on the housing are installed in the series production.
	The following fault messages could be shown in red lettering in the instrument cluster (KI):	As of VIN end number 363850 temperature tested battery control units with a new software release of Q2
	"Stop! Battery/Alternator"	(A 211 540 27 45) are being installed in the series production.
	"Brake defective! Stop the vehicle!"	The white stamp on the housing is now omitted.
	Furthermore, fault codes 9050 and 9051 for consumer shutoff stages 1 and 2 are stored in the battery control unit.	If a battery control unit (BSG) is installed with an older Q-status: ↓ 2 Remove/install/replace battery control unit (BSG).

PARTS ORDERING NOTES

Part no.	Designation	Quantity
A 211 540 27 45	Battery control unit	as required