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2003 S500
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3,850 Posts
Discussion Starter · #1 ·
I have read thru the encyclopedia, and have done advanced searches with no answer - is there a reset procedure for the 2003 S430 HVAC System without using the DAS/STAR system? Mine is occasionally doing some odd things...
 

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W220 Moderator
2006 S500- "Betty" who unfortunately got side swiped and has been replace by Beatryx, a 2017 S550
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1,140 Posts
this may be 1 model year too new but worth a try >>

I used these for my 2004 S430 4MATIC sedan. Good reference. Hope this helps!

W220 S430 AC / Heating control error codes and how to reset

1) Set the car in park and turn on the engine, hold the rest and particle filter buttons down together for about 5 seconds (The screen will show searching)
2) This screen gives you the fault codes. If you're curious, scroll up and down to see them using the temp up and down switch.
3) Pop out the left auto vent button and right auto vent button.
4) Now press the the left button in, and then the right one. The system will reset.
5) Turn the car off, wait a minute, then turn it back on again. If you don't have any further problems, the light should stay off. (If it comes back on again, you have more things to do)


Some of the possible error 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 (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
 

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2003 S500
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Discussion Starter · #5 · (Edited)
Thanks for the replies. I just went out and tried the procedure - it works on the 2003 as well. Perhaps Warren can add this to the stickypedia for the resets. In my case, there were no error codes...

The first problem has been that my feet are cold. I was forlornly hoping that the problem would be something other than the traditional broken arm on the footwell servo. Oh, well, I suppose that I will get to disassemble the dash.

The rest of the story...

Today, the temp was a somewhat unusual 7 deg F here in the Metro Atlanta area. The car started pretty normally, but the HVAC blower was totally dead. After several errands, the wife and I went to Costco, filled up with premium, moved the car and went inside. During all of this time, the only fault was the dead blower. Car started normally several times, ran normally.

Came out of Costco, car unlocked normally, trunk opened - everything was normal. Turned the key, and the starter solenoid chattered a few times, then nothing. Everything still seemed normal except for the lack of starter action.

I called my younger son, who showed up in thirty minutes or so. Jumper cables were applied, and the car started instantly. I immediately checked the system voltage. It was 13.87 VDC, so the alternator is working - to some extent, at least.

The blower now worked normally. No resets seemed to be needed for anything.

We drove the car home and I hooked a 1.5 Amp battery maintainer to the battery. It will stay on the car for a few days. I will give the battery another chance - the next problem will see some serious testing, and probably a new battery installed. At 71 I don't try to nurse weak batteries along any more.
 

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2017 S63 Cabriolet
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348 Posts
sorry if this is already in the notes but I had this and though I'd share
AC diags There are THREE of them on the W220 chassis

Test 1. Hold down the the AC REST button until until the AC display shows the 0 – 99 parameters without legend.
(or press both the REST and “0” buttons together until the display shows the same but with legend in German)
See long full list at the bottom of these instructions.

Test 2. Press REST and RECIRCULATE buttons together until display shows the AC 0 – 13 vent doors test
It brings up a menu with.... what looks like a choke logo(but in fact is the FLAPS!).
Use the hi or low left (to change item), and use the hi and low right (to adjust setting)
Setting seem to reset to what they were when the car restarts so assume good for verifying flaps etc.
NR 00 Closed - All internal air flaps
NR 01 Closed - Defrost Flap - Left
NR 02 Closed - Defrost Flap - Right
NR 03 Closed - Foot Well Flap - Left
NR 04 Closed - Foot Well Flap - Right
NR 05 Closed - Window Flap - Left
NR 06 Closed - Window Flap - Right
NR 07 Closed - Centre Front/Rear Flap - Left
NR 08 Closed - Centre Front/Rear Flap - Right
NR 09 Closed - Recycle Flaps
NR 10 Closed - AKF - By Pass Flaps
NR 11 Inaktiv - Flap calibration
NR 12 0% - Fan Motor Engaged
NR 13 0% - Cold Compressor Engaged

Test 3. Press REST and ACTIVATED CHARCOAL FILTER buttons buttons together until display shows the AC error diagnostic and clearing (two AUTO buttons)
The air con screen will show "searching..."
The screen gives you the fault codes or "_ _ _ _" if there is none. Scroll up and down to see them all using the heat toggle switch.
Pop out the left and right auto vent buttoms, then press the the left one in FIRST, and then the right one. The system resets.
Ignition off, then back on again , and the air con screen is back to normal.
I assume this should be performed AFTER you have replaced the AC charcoal filters (not the cabin filters).


Test 1 "Hold AC REST button until display shows:"
Description S500 (2002)
0 0 AAC incar temperature sensor (operating module) 30.6 Cº
1 1 Overhead Control panel for incar temperature sensor 30.2 Cº
2 2 Outside temperature sensor 24 Cº
3 3 Left heater exchanger in car temperature sensor 20.6 Cº
4 4 Right heater exchanger in car temperature sensor 12.2 Cº
5 5 Evaporator Core sensor 2.1 Cº
6 6 Engine temperature 88 Cº
7 7 Refrigerant pressure (7.5 BAR Stand-by) 9.5
BAR (AC ON)
8 8 R134A Refrigerant in car temperature sensor 28 Cº
9 L UNTER KÜMLUNG 9.9 K
10 10 Blower Control voltage 1.8 V
11 SONNE LI VO 22 %
12 SONNE RE VO 39 %
13 SONNE RE HI 42 %
14 SONNE LI HI 13 %
15 15 Average insolation value between 0 and 125% 26 %
16 16 Carbon monoxide value between 0 and 1023 680
17 17 Nitrogen oxide value between 0 and 1023 200
18 18 Dew point temperature 23.5 Cº
19 max UNTER KÜMLUNG 12.8 K
20 20 Fan output value between 0 and 100% 0 %
21 21 Engine speed 1788 /min
22 22 Ground speed 87 km/h
23 BEL. -DIMMUNG 0 %
24 24 Battery voltage 14.2 V
25
26
27 27 Left hand potentiometer engine speed value between 0 and 100% 100 %
28 28 Centre potentiometer engine speed value between 0 and 100% 0 %
29 29 Right hand potentiometer engine speed value between 0 and 100% 100 %
30 30 Temp of blow air in left rear passenger compartment
31 31 Temp of blow air in left rear passenger compartment
32 32 Temp of evaporator Core in rear passenger Compartment
33 33 Blower voltage in rear passengercompartment
34 34 Specified temperature in left rear passenger compartment
35 35 Specified temperature in right rear passenger compartment
36
37
38 BUILT NR KLA 73
39
40 40 Left hand defroster door value (open/closed plain text at limit stop) ZU
41 41 Right hand defroster door value (open/closed plain text at limit stop) ZU
42 42 Left hand footwell flap value between 0 and 100% ZU
43 43 Right hand footwell flap value between 0 and 100% ZU
44 44 Left hand blend flap value between 0 and 100% AUF
45 45 Right hand blend flap value between 0 and 100% AUF
46 46 Left hand diverter flap 0 and 100% ZU
47 47 Right hand diverter flap value 0 and 100% ZU
48 48 Recirculation door 0 and 100% Frischl.
49 49 AKF bypass flap 0 and 100% AUS
50 50 AAC Software 58
51 51 AAC Hardware 2601
52 52 Software for rear passenger Compartment air Conditioning
53 53 Hardware for rear passenger Compartment air Conditioning
54 54 Software for stepper motor unit 37
55 55. Hardware for stepper motor unit 10
56 56 Software for Centre nozzle 28
57 57 Hardware for Center nozzle 42
58 58 Software for multifunction sensor 19
59 59 Hardware for multifunction sensor 01
60 60 Sofware for daybrightness sensor 32
61 61 Hardware for daybrightness sensor 16
62 REGEL -OFFSET 2 K
63 GEBL. -OFFSET 0.8 V
64
65
66
67
68
69 TUNNEL - MODE Automat.
70 FOLLST. KONTR. Aktiv
71 UL - LOGIK (AKF) Aktiv
72 UL - LOGIK GEN. Inaktiv
73 TUNNEL FUNKTION Aktiv
74 GEBLÄSEBALKEN Generell
75 REHEAT MODUS Inaktiv
76 UMLUFT MANUELL Zeitbegr.
77 DISPLAY Automat.
78 HEISSLAND Inaktiv.
79 MAXCOOL Aktiv.
80 DISPLAY Automat.
81 ABSPEICHERUNG Schlüssel.
82 SCHNELLLAUF Aktiv.
83 UMLUFT 100% Moglich.
84 GEBL. -REAKTION Aktiv.
85 GRUNDEINSTELL Inaktiv.
86 UL-KL. BEI "0" Geschl.
87 GRUNDBELÖFTUNG Aktiv.
88 ESL 20 bar 100% Aktiv.
89 ESL 20 bar 90% Inaktiv.
90 ESL 18 bar 100% Inaktiv.
91 ESL 18 bar 90% Inaktiv.
92 ESL Gndbel. 25% Aktiv.
93 ESL Gndbel. 40% Inaktiv.
94
95
96 Compressor torque (Nm) 9 Nm
97 KOMP STELL 25 %
98 Compressor valve DC current (mA) 270 mA
99 INNER REGLER 26.8 Cº
 
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2006 S500
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Alternator Issue

Thanks for the replies. I just went out and tried the procedure - it works on the 2003 as well. Perhaps Warren can add this to the stickypedia for the resets. In my case, there were no error codes...

The first problem has been that my feet are cold. I was forlornly hoping that the problem would be something other than the traditional broken arm on the footwell servo. Oh, well, I suppose that I will get to disassemble the dash.

The rest of the story...

Today, the temp was a somewhat unusual 7 deg F here in the Metro Atlanta area. The car started pretty normally, but the HVAC blower was totally dead. After several errands, the wife and I went to Costco, filled up with premium, moved the car and went inside. During all of this time, the only fault was the dead blower. Car started normally several times, ran normally.

Came out of Costco, car unlocked normally, trunk opened - everything was normal. Turned the key, and the starter solenoid chattered a few times, then nothing. Everything still seemed normal except for the lack of starter action.

I called my younger son, who showed up in thirty minutes or so. Jumper cables were applied, and the car started instantly. I immediately checked the system voltage. It was 13.87 VDC, so the alternator is working - to some extent, at least.

The blower now worked normally. No resets seemed to be needed for anything.

We drove the car home and I hooked a 1.5 Amp battery maintainer to the battery. It will stay on the car for a few days. I will give the battery another chance - the next problem will see some serious testing, and probably a new battery installed. At 71 I don't try to nurse weak batteries along any more.
If you have a gel battery then the charge volts are low. C/be the alternator or bad battery connections. Clean up the battery terminals and ground connections and re test volts at the battery from the alternator. If you're getting less that 14.2V you may want to consider a rebuild on the alternator and 14.2-14.4 is required.

A Gel battery needs to be at 12.8V fully charged and at rest. If it can't hold that charge, then a new battery is in your future. My guess is a new alternator and battery are in your future. :eek:
 

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'06 S430
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What reset procedure should work on '06? Just as of yesterday my car is acting like the interior temp is freezing, meaning that setting the temp to 56 still produces low fan warm air, I put it on LOW and medium fan but ice cold. All other functions work properly.
 

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2003 S500
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Discussion Starter · #11 ·
One cause for that is a broken wire on the interior temp sensor - not too difficult a DIY fix. I'm leaving momentarily, so don't have time to search, but if you search for threads on broken temp sensor wires, you should find detailed instructions.
 

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2003 SL500, 2000 S500
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Just as of yesterday my car is acting like the interior temp is freezing...
I would first check the plausibility of the in-car temperature sensor values. From jnash's post #7:
Hold down the the AC REST button until until the AC display shows the 0 – 99 parameters without legend.​
The sensor values are parameters 0 and 1.
 

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W220 Moderator
2006 S500- "Betty" who unfortunately got side swiped and has been replace by Beatryx, a 2017 S550
Joined
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1,140 Posts

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W220 Moderator
2006 S500- "Betty" who unfortunately got side swiped and has been replace by Beatryx, a 2017 S550
Joined
·
1,140 Posts
Hello? anyone know...? if its defective, do I replace it or are there wires or something...?

You might try resetting the HVAC system, see if the code returns first.
If it does then check the plug(s) on the back side of the unit to ensure fully seated.
If they are fully seated then you can look into a replacement, used from breakers on Ebay, remanufactured from Ebay or new from dealer. New from the dealer may cause another mortgage payment to go missing ;)
 

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Premium Member
2003 SL500, 2012 E350 4Matic P2
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841 Posts
Hello? anyone know...? if its defective, do I replace it or are there wires or something...?

You might try resetting the HVAC system, see if the code returns first.
If it does then check the plug(s) on the back side of the unit to ensure fully seated.
If they are fully seated then you can look into a replacement, used from breakers on Ebay, remanufactured from Ebay or new from dealer. New from the dealer may cause another mortgage payment to go missing. :)
Take a look at this thread Post #7 if you finally determine you need a new control unit. You can use a newer unit as I did but you have to clear the internal codes stored in the replacement unit and it will then work in your system.

Good Luck, Bob
 

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S500
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Take a look at this thread Post #7 if you finally determine you need a new control unit. You can use a newer unit as I did but you have to clear the internal codes stored in the replacement unit and it will then work in your system.

Good Luck, Bob
thanks for the replies. I have done the reset procedure, both of them...(REST button, auto button in/out L and R) at least 50 times. Same errror. I am able to delete it, but it always comes back. So I believe its shot. Are these units expensive, I'm sure I could replace it my self, but getting it would be the issue...:cool:
 

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2006 S500- "Betty" who unfortunately got side swiped and has been replace by Beatryx, a 2017 S550
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