Hier mal eine Anleitung wie man beim W220 / W215 den Fehlerspeicher selbst über die Klimaautomatik auslesen kann:
Rest + Aktivkohlefilter zusammen für ca. 5 Sekunden drücken.
Anschließend werden die Fehler gesucht.
Hier eine Erlärung für die Fehlercodes (leider Englisch):
B1000 Control unit N22 (AAC pushbutton module) is defective.
B1022 Fault in CAN communication w/ control unit ESA-FL
(Electrically adjusted front left seat)
B1023 Fault in CAN communication w/ control unit ESA-FR
(Electrically adjusted front right seat)
B1053 Fault in CAN......DCM-RR (Door control module rear right)
B1054 Fault in CAN......DCM-FR (Door control module front right)
B1055 Fault in CAN......DCM-FL (Door control module front left)
B1056 Fault in CAN......DCM-RL (Door control unit rear left)
B1057 Fault in CAN......OCP (Overhead Control Module)
B1059 Fault in CAN......SAM-FL (Front Left Signal Aquisition Module)
B1074 Fault in CAN......EIS (Electronic Ignition Switch)
B1075 Fault in CAN......SAM-FR(front right Signal Aquisition Module)
B1076 Fault in CAN......REAR SAM (Rear Signal Aquisition Module)
B1087 Fault in CAN......TSTH (Stationary Heater)
B1088 Fault in CAN......ICM (Instrument Cluster Module)
B1219 N22b1 (In car temperature sensor)
B1228 B10/2 (Left heat exchanger temperature sensor)
B1229 B10/3 (Right heat exchanger temperature sensor)
B1230 B10/6 (Evaporator sensor)
B1241 Refrigerant Level is too low
B1256 B10/6 (Evaporator temperature sensor) Evaporator front
B1257 Refrigerant pressure is 0 bar
B1267 Communication Fault of A/C bus
B1268 Communication fault of A/C bus w/ control unit N18/4
(Center vents electronic control module)
B1269 Communication fault of A/C bus with control unit B31/1
(AAC multi function sensor)
B1270 Communication fault of A/C bus w/ control unit B32/2
(AAC sun sensor (4 in total))
B1271 Communication fault of A/C bus w/ control unit N22/5
(Stepping motor electronics control module)
B1298 B10/6 Evaporator temperature sensor (Evaporator rear)
B1417 A31y1 (left duo valve) Heater valve
B1418 A31y2 (right duo valve) Heater valve
B1424 A32m2 (activated charcoal filter flap adjustment motor)
B1434 Voltage supply of A/C bus
B1451 M16/17 Left center vent diverter flap actuator motor
B1452 M16/19 Left center vent temperature regulating flap actuator motor
B1453 M16/21 Fresh air and recirculated air flap actuator motor
B1455 M16/13 Left defroster nozzle flap actuator motor
B1456 M16/14 Right defroster nozzle flap actuator motor
B1457 M16/15 Left footwell flap actuator motor
B1458 M16/16 Right footwell flap actuator motor
B1463 M16/18 Right center vent diverter flap actuator motor
B1464 M16/20 Right center vent temperature regulating flap actuator motor.
B1849 Fault in CAN communication with control unit N22/4 rear A/C control unit
Um die Fehler zu löschen, einfach den linken Auto-Taster (rund) ein mal raus und wieder rein drücken.
Um wieder in die normale Ansicht zu gelangen, einfach auf Rest drücken.
Viel Spaß 
P.S. Ist bereits mehrfach getestet, man macht damit absolut nix kaputt.
Gruß Flo
