ACoff light stays lit; reset?
Thread Starter
Newbie
Joined: Sep 2019
Posts: 13
Likes: 1
CLA250, S600
ACoff light stays lit; reset?
My HVAC "ACoff" light is on and won't go off when I press the button. I also tried lowering the temp to the lowest possible to see if that would get it to come on and it didn't. I have heard that the dealer can do some kind of reset for that button if there are no other issues. Is there a way I can try to do it from my driveway? Secret menu?
MBWorld Fanatic!
Joined: Mar 2006
Posts: 4,278
Likes: 377
From: San Jose area
'19 E63S sedan
My HVAC "ACoff" light is on and won't go off when I press the button. I also tried lowering the temp to the lowest possible to see if that would get it to come on and it didn't. I have heard that the dealer can do some kind of reset for that button if there are no other issues. Is there a way I can try to do it from my driveway? Secret menu?
a.) a/c switch "on"
b.) push both charcoal filter button and
REST at the same time.
c.) you can scroll how many faults the a/c system
has by using the temperature selector
button.from the a/c display screen you can see
what fault codes you have and how many.
d.) to delete the fault press left AIR AUTO button
and then press right AIR AUTO button.
e.) press out the right AIR AUTO button and then
press out the left AIR AUTO button, after you
did this the display will show it is deleting
fault codes.
MBWorld Fanatic!
Joined: Mar 2006
Posts: 4,278
Likes: 377
From: San Jose area
'19 E63S sedan
Probably a freon leak, but you should be able to get into the stored codes:
a.) a/c switch "on"
b.) push both charcoal filter button and
REST at the same time.
c.) you can scroll how many faults the a/c system
has by using the temperature selector
button.from the a/c display screen you can see
what fault codes you have and how many.
d.) to delete the fault press left AIR AUTO button
and then press right AIR AUTO button.
e.) press out the right AIR AUTO button and then
press out the left AIR AUTO button, after you
did this the display will show it is deleting
fault codes.
a.) a/c switch "on"
b.) push both charcoal filter button and
REST at the same time.
c.) you can scroll how many faults the a/c system
has by using the temperature selector
button.from the a/c display screen you can see
what fault codes you have and how many.
d.) to delete the fault press left AIR AUTO button
and then press right AIR AUTO button.
e.) press out the right AIR AUTO button and then
press out the left AIR AUTO button, after you
did this the display will show it is deleting
fault codes.
B1000 Control unit N22 (AAC pushbutton module) is
defective.
B1022 Fault in CAN communication w/ control unit ESA-
FL (Electrically andjusted 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 (Dorr 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
Thread Starter
Newbie
Joined: Sep 2019
Posts: 13
Likes: 1
CLA250, S600
you deserve many invisi-bucks! The error was B1298 (Evaporator temperature sensor). I reset it and the light goes off now when I press the button. I haven't driven it yet but feel better about it already.
I had an issue where the radiator fan wasn't spinning so I replaced it. In diagnosing it, I turned the AC way down... steam started coming out of the engine bay and the engine started to stutter so I quickly shut it off. I'm thinking the code was stored since then?
I had an issue where the radiator fan wasn't spinning so I replaced it. In diagnosing it, I turned the AC way down... steam started coming out of the engine bay and the engine started to stutter so I quickly shut it off. I'm thinking the code was stored since then?
Thread Starter
Newbie
Joined: Sep 2019
Posts: 13
Likes: 1
CLA250, S600
Probably a freon leak, but you should be able to get into the stored codes:
a.) a/c switch "on"
b.) push both charcoal filter button and
REST at the same time.
c.) you can scroll how many faults the a/c system
has by using the temperature selector
button.from the a/c display screen you can see
what fault codes you have and how many.
d.) to delete the fault press left AIR AUTO button
and then press right AIR AUTO button.
e.) press out the right AIR AUTO button and then
press out the left AIR AUTO button, after you
did this the display will show it is deleting
fault codes.
a.) a/c switch "on"
b.) push both charcoal filter button and
REST at the same time.
c.) you can scroll how many faults the a/c system
has by using the temperature selector
button.from the a/c display screen you can see
what fault codes you have and how many.
d.) to delete the fault press left AIR AUTO button
and then press right AIR AUTO button.
e.) press out the right AIR AUTO button and then
press out the left AIR AUTO button, after you
did this the display will show it is deleting
fault codes.
MBWorld Fanatic!
Joined: Mar 2006
Posts: 4,278
Likes: 377
From: San Jose area
'19 E63S sedan
