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A/C Hidden Menu W220 W215 S-Class

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The air conditioner, Automatic Climate Control (ACC) on the Mercedes-Benz W220 S-Class, W215 CL-Class can be troubleshoot by accessing the hidden menu. In this article we will show you how to access the hidden menus to stream live data from ECU and also read, reset and clear air conditioner fault codes. There are several hidden menus on the S-Class, let’s first start with showing how to stream some data from the sensors.

The hidden menus on the W220 Auto Climate Control can be used to:

  • Stream Sensor Parameter Values including:Engine Fan, A/C Compressor, ACC Flap/Vent, Rear Clear Fault Error Codes
  • Clear, view, review, erase the Automatic Climate Control fault DTC codes.

Hidden Menu 1: How to stream live sensor data, including voltage and engine RPM.

turn key ignition

Step 1

Turn key to position 2. All dash lights should be on. Don’t start the engine yet. Turn on climate control.

hidden menu mercedes

Step 2

Press and hold the REST button until the screen should display new text starting with NR.01.

Step 3

Press the TEMPERATURE up and down arrows to scroll through the menu. Depending with what sensors and units your S-Class is equipped with you will see sensor live data on the right of the NR. text.

Here you will be able to see the engine voltage NR.24 or engine RPM NR21.


Step 4






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Press REST button again to exit the menu.

What are some important NR. values you should check?

NR.00Temperature inside the cabin,  Sensor N22/b1
NR.01In Car Temperature Sensor (N70b1)
NR.02Ambient Temperature Sensor (B14)
NR.03Heater Core Temperature Sensor Left (B10/2)
NR.04Heater Core Temperature Sensor Right (B10/3)
NR.05Evaporator Core Temperature Sensor (B10/6)
NR.06Engine Coolant Temperature Sensor (B11/4)
NR. 07Refrigerant (R134A) Pressure Sensor (B12)
NR.22Engine Crankshaft Rotation Speed, RPM
NR.24Battery Voltage

If you need the complete list see the attachment file on this BenzWorld.org thread: W220 S-Class Automatic Climate Control (ACC) Hidden Menu

W220 S-Class Automatic Climate Control (ACC) Hidden Menu

Read / retrieve the Fault Codes from Automatic Conditioner Control Unit

Read the Auto Climate Control Fault Memory

  1. You can also access the diagnostic trouble codes right in the ACC. Start by pressing the two rotating knobs in.
  2. Press Air Filter and REST button simultaneously and hold for at least 5 seconds. w220 hidden menu
  3. You show now see a new message on the screen. The message should read “DIAGN. ERROR”
  4. Use the temperature buttons to go up and down. This will allow you to scroll through the fault codes if there are any. s55 air conditioner menu

Read / retrieve the Fault Codes from Automatic Conditioner Control Unit

Read the Auto Climate Control Fault Memory

  1. You can also access the diagnostic trouble codes right in the ACC. Start by pressing the two rotating knobs in.
  2. Press Air Filter and REST button simultaneously and hold for at least 5 seconds. w220 hidden menu
  3. You show now see a new message on the screen. The message should read “DIAGN. ERROR”
  4. Use the temperature buttons to go up and down. This will allow you to scroll through the fault codes if there are any. s55 air conditioner menu

Reset A/C Automatic Conditioner - Erase Trouble Codes

Erase the Diagnostic Trouble Codes

  1.  To erase the fault codes you will first need to scroll through all the Diagnostic Trouble Codes (DTC) or the fault codes. Then set the screen to Fault Code.
  2. Press to extend out the left button and then do the same with the right button. Round knob. ac button out w220
  3. Now press in the left round knob. Next press the right knob in. ac w220 hidden menu
  4. Once you have reset the trouble codes, press the REST button to exit.  hidden menu mercedes

Conclusion

If you have been having Air Conditioner problems with your Mercedes-Benz W220 S430 S500 S600 S55 AMG, you want to check the Auto Climate Control fault memory. Once you scan through the fault codes, go ahead and reset them. Often times this may solve your A/C problem, but not always.

Note that Pressure Sensor Values can be streamed in parameter NR.07. The Pressure sensor should be around 5.5 to 14 bar. While the refrigerant temperature, measured via sensor B12/1, should be between 65 °F to 110°F approximately and should be parameter NR.08.

If resetting the codes doesn’t fix your A/C problem, you should make sure that the A/C refrigerant level are not low. If they are, use a product such as the A/C Professional Formula R-134a Air Conditioning.

If all fails, your last bet would be to connect your car to Mercedes-Benz Diagnostic Scanner C3 or C4,, they both work well. This will allow you to do further testing and troubleshooting.

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