Blower fan inop...94 S500 - Mercedes-Benz Forum
 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 05-29-2018, 12:56 PM Thread Starter
BenzWorld Elite
 
Doni's Avatar
 
Date registered: Nov 2008
Vehicle: Vogon constructor fleet.
Location: Magrathea
Posts: 8,928
Mentioned: 9 Post(s)
Quoted: 2189 Post(s)
(Thread Starter)
Blower fan inop...94 S500

I just pulled my '94 S500 out of winter storage and the blower fan for the HVAC isn't working. It was when the car was parked. I've checked the 18/20/21 fuses and all seem good.

Two questions:

Is there an interior fan relay somewhere I can check and, if so, where is it located?
Will a bad fan resistor keep the fan from turning ON? I've seen threads about it not turning OFF, but not ON.
How does one pull the HVAC codes from the Climate Control head with two wheels? I've seen info for later models but not mine.


As it's in the 90's here now, I can't drive this car without AC so your help would be GREATLY appreciated.

THANKS IN ADVANCE!!

Pecuniam Habere Nobis Necesse Est...
Doni is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 05-30-2018, 02:40 AM
BenzWorld Elite
 
samosali's Avatar
 
Date registered: Nov 2007
Vehicle: W140 Mercedes 500 SE, 1992, European, 410.000 km
Location: Slovenia (Europe)
Posts: 3,503
Mentioned: 0 Post(s)
Quoted: 267 Post(s)
here is instructions. make the tests first and maybe you will find a fault.
Attached Files
File Type: pdf diagnostics_HVAC.pdf (83.7 KB, 27 views)

All I wish for Christmas is a smooth idle.

Last edited by samosali; 05-30-2018 at 02:43 AM.
samosali is offline  
post #3 of 3 (permalink) Old 05-30-2018, 02:44 AM
BenzWorld Elite
 
samosali's Avatar
 
Date registered: Nov 2007
Vehicle: W140 Mercedes 500 SE, 1992, European, 410.000 km
Location: Slovenia (Europe)
Posts: 3,503
Mentioned: 0 Post(s)
Quoted: 267 Post(s)
i am not able to attach the pdf. here it is:

Description and Operation
The automatic air conditioner (A/C) in the W140 models can be diagnosed by performing the following steps. There are two (2) basic tests; the first reads the actual sensor values; the second, readout of the DTCs.

The display windows (arrows) show in sequence the actual temperature sensor readings, refrigerant pressure, blower control voltage, software status and control module version.

Reading Sensor Values
The following preparation are required for test:
Air Conditioner control setup - Set the TEMPERATURE selector wheels into the WHITE [white] area.
- Turn Ignition to ON or preferably, start car and let it idle
- Press left and right [AUTO] buttons
- Within 20 seconds, then press [REST] button until the display changes (about 9 secs)
- Number '1' appears in the left window; the in-car temperature in the right ('73 F') as shown in picture, - OR -
HI if there is a short circuit, LO is there is an open circuit.
- By pressing the left [AUTO] button, the next value is displayed in the right window per the table below.
- Press the right [AUTO] button, to go back to the previous value displayed.
- Press [REST] button to end the test program.

Test Step Sensor Value Display 1 In-car temperature sensor w/ aspirator blower (B10/4) 2 Outside temperature sensor (B10/5) 3 Left heater core temperature sensor (B10/2)* 4 Right heater core temperature sensor (B10/3)* 5 Evaporator temperature sensor (B10/6) 6 Coolant temperature sensor (B10/8)*
7 Refrigerant pressure in bar (06 = 6 bar) 8 Blower control voltage from B(min) - 60(max) 9 Software status, A/C push button control module, manufacturer Bosch: 57, 58, etc.: manufacturer Kammer: 02, 03, etc. 10 ** Left heater core temperature sensor (B10/9) (rear climate control) 11 ** Right heater core temperature sensor (B10/10) (rear climate control) 12 ** Evaporator temperature sensor (B10/11) (rear climate control) 13 ** Software status, rear A/C control unit, manufacturer Bosch: 42 *** 16 Active charcoal filter: R = equipped; O = not equipped


Reading DTCs from Auto A/C System
The following preparation are required for test:
- Set the LEFT TEMPERATURE selector wheel into the RED [red] area.
- Set the RIGHT TEMPERATURE selector wheel into the BLUE [blue] area.
- Turn Ignition to ON.
- Press left [AUTO] button.
- Within 10 seconds, simultaneously press [REST] and [O] buttons until the displays shows permanent stored DTCs in memory per the table below. Press the RIGHT [AUTO] button until all stored DTCs are displayed. Record each as they are displayed.
- Each fault has a specific DTC. The letter 'E' (error) along with the hundredth digit of the display code will show in the window. The tenth and single digit of the code displays in the right window. By pressing the right [AUTO], the next DTC stored in memory will be displayed.
- Turn the ignition OFF and repair recorded DTCs according to the respective diagnostic chart.

- To delete stored DTCs, repeat the first five (5) steps, then press the LEFT [AUTO] for the letter 'D' (delete) to appear in the window. By pressing the right [AUTO] the display code will be deleted from memory. Continue to press the left and right [AUTO] buttons until all codes are deleted from memory. The display will show 'E0 00'.
- Return the temperature selector to normal setting.

Display Code Possible Cause
E0 01 No faults in system
E0 02 A/C push button control module (N22)
E0 03 Rear climate control module
E0 06 Connection to switchover valve block (Y11)
E0 07 Data exchange (CAN B), short circuit
E0 08 Data exchange (CAN A), short circuit
E0 09 Data exchange (CAN A and B), short circuit
E0 10 Repeat displaying for malfunction readout
E0 11 Data exchange (CAN B), open circuit
E0 12 Data exchange (CAN A), open circuit
E0 13 connection to rear climate control module
E0 14 Data exchange (CAN B), open circuit (rear climate control)
E0 15 Data exchange (CAN A), open circuit (rear climate control)
E0 16 In-car temperature sensor w/ aspirator blower (B10/4), short circuit *)
E0 17 In-car temperature sensor w/ aspirator blower (B10/4), short circuit **)
E0 18 In-car temperature sensor w/ aspirator blower (B10/4), open circuit *)
E0 19 In-car temperature sensor w/ aspirator blower (B10/4), open circuit **)
E0 24 Left heater core temperature sensor (B10/2), short circuit *)
E0 25 Left heater core temperature sensor (B10/2), short circuit **)
E0 26 Left heater core temperature sensor (B10/2), open or short circuit *)
E0 27 Left heater core temperature sensor (B10/2), open or short circuit **)
E0 28 Right heater core temperature sensor (B10/3), short circuit *)
E0 29 Right heater core temperature sensor (B10/3), short circuit **)
E0 30 Right heater core temperature sensor (B10/3), open or short circuit *)
E0 31 Right heater core temperature sensor (B10/3), open or short circuit **)
E0 32 Outside temperature sensor (B10/5), short circuit *)
E0 33 Outside temperature sensor (B10/5), short circuit **)
E0 34 Outside temperature sensor (B10/5), open or short circuit *)
E0 35 Outside temperature sensor (B10/5), open or short circuit **)
E0 36 Evaporator temperature sensor (B10/6), short circuit *)
E0 37 Evaporator temperature sensor (B10/6), short circuit **)
E0 38 Evaporator temperature sensor (B10/6), open or short circuit *)
E0 39 Evaporator temperature sensor (B10/6), open or short circuit **)
E0 40 A/C Coolant temperature sensor (B10/8), short circuit *)
E0 41 A/C system coolant temperature sensor (B10/8), short circuit **)
E0 42 A/C system coolant temperature sensor (B10/8), open or short circuit *)
E0 43 A/C system coolant temperature sensor (B10/8), open or short circuit **)
E0 44 Refrigerant pressure sensor (B12), short circuit *)
E0 45 Refrigerant pressure sensor (B12), short circuit **)
E0 46 Refrigerant pressure sensor (B12), open or short circuit *)
E0 47 Refrigerant pressure sensor (B12), open or short circuit **)
E0 48 Left temperature selector wheel, short circuit *)
E0 49 Left temperature selector wheel, short circuit **)
E0 50 Left temperature selector wheel, open or short circuit *)
E0 51 Left temperature selector wheel, open or short circuit **)
E0 52 Right temperature selector wheel, short circuit *)
E0 53 Right temperature selector wheel, short circuit **)
E0 54 Right temperature selector wheel, open or short circuit *)
E0 55 Right temperature selector wheel, open or short circuit **)
E0 72 Heater supply unit circulation pup (A31m1), short circuit *)
E0 73 Heater supply unit circulation pup (A31m1), short circuit **)
E0 74 Heater supply unit circulation pup (A31m1), open or short circuit *)
E0 75 Heater supply unit circulation pup (A31m1), open or short circuit **)
E0 76 Heater supply unit circulation pump (A31m1), over load *)
E0 77 Heater supply unit circulation pup (A31m1), over load **)
E0 80 Heater supply unit left duovalve (A31y1), short circuit *)
E0 81 Heater supply unit left duovalve (A31y1), short circuit **)
E0 82 Heater supply unit left duovalve (A31y1), open or short circuit *)
E0 83 Heater supply unit left duovalve (A31y1), open or short circuit **)
E0 84 Heater supply unit right duovalve (A31y2), short circuit *)
E0 85 Heater supply unit right duovalve (A31y2), short circuit **)
E0 86 Heater supply unit right duovalve (A31y2), open or short circuit *)
E0 87 Heater supply unit right duovalve (A31y2), open or short circuit **)
E0 88 A/C compressor ground activation *)
E0 89 A/C compressor ground activation **)
E0 90 A/C compressor ground activation, open or short circuit *)
E0 91 A/C compressor ground activation, open or short circuit **)
E0 96 Auxiliary fan, 1st activation, short circuit *)
E0 97 Auxiliary fan, 1st activation, short circuit **)
E0 98 Auxiliary fan, 1st activation, open or short circuit *)
E0 99 Auxiliary fan, 1st activation, open or short circuit **)
E1 00 Auxiliary fan, 2nd stage activation, short circuit *)
E1 01 Auxiliary fan, 2nd stage activation, short circuit **)
E1 02 Auxiliary fan, 2nd stage activation, open or short circuit *)
E1 03 Auxiliary fan, 2nd stage activation, open or short circuit **)
E1 04 Auxiliary fan, 3nd stage activation, short circuit *)
E1 05 Auxiliary fan, 3nd stage activation, short circuit **)
E1 06 Auxiliary fan, 3nd stage activation, open or short circuit *)
E1 07 Auxiliary fan, 3nd stage activation, open or short circuit **)
E1 08 After-run pump relay (K30), power supply, short circuit *) ***)
E1 09 After-run pump relay (K30), power supply, short circuit **) ***)
E1 10 After-run pump relay (K30), power supply, open or short circuit *) ***)
E1 11 After-run pump relay (K30), power supply, open or short circuit **) ***)
E1 12 Engine rpm increase diode matrix (V2), short circuit *)
E1 13 Engine rpm increase diode matrix (V2), short circuit **)
E1 14 Engine rpm increase diode matrix (V2), open or short circuit *)
E1 15 Engine rpm increase diode matrix (V2), open or short circuit **)
E1 16 Charcoal filter actuator (A32m2) (OPEN), short circuit *)
E1 17 Charcoal filter actuator (A32m2) (OPEN), short circuit **)
E1 18 Charcoal filter actuator (A32m2) (OPEN), open or short circuit *)
E1 19 Charcoal filter actuator (A32m2) (OPEN), open or short circuit **)
E1 20 Charcoal filter actuator (A32m2) (CLOSED), short circuit *)
E1 21 Charcoal filter actuator (A32m2) (CLOSED), short circuit **)
E1 22 Charcoal filter actuator (A32m2) (CLOSED), open or short circuit *)
E1 23 Charcoal filter actuator (A32m2) (CLOSED), open or short circuit **)
E1 28 Left rear heater core temperature sensor (B10/9), short circuit *)
E1 29 Left rear heater core temperature sensor (B10/9), short circiut **)
E1 30 Left rear heater core temperature sensor (B10/9), short or open *)
E1 31 Left rear heater core temperature sensor (B10/9), short or open **)
E1 32 Right rear heater core temperature sensor (B10/10), short *)
E1 33 Right rear heater core temperature sensor (B10/10), short **)
E1 34 Right rear heater core temperature sensor (B10/10), short or open *)
E1 35 Right rear heater core temperature sensor (B10/10), short or open **)
E1 36 Left temperature selector wheel, short *)
E1 37 Left temperature selector wheel, short **)
E1 38 Left temperature selector wheel, short *)
E1 39 Left temperature selector wheel, short or open **)
E1 40 Right temperature selector wheel, short *)
E1 41 Right temperature selector wheel, short **)
E1 42 Right temperature selector wheel, short or open *)
E1 43 Right temperature selector wheel, short or open **)
E1 44 Right evaporator temperature selector wheel (B10/11), short *)
E1 45 Right evaporator temperature selector wheel (B10/11), short **)
E1 46 Right evaporator temperature selector wheel (B10/11), short or open *)
E1 47 Right evaporator temperature selector wheel (B10/11), short or open **)
E1 48 Coolant circulation pump (A31/1m1), short *)
E1 49 Coolant circulation pump (A31/1m1), short **)
E1 50 Coolant circulation pump (A31/1m1), short or open *)
E1 51 Coolant circulation pump (A31/1m1), short or open **)
E1 52 Coolant circulation pump (A31/1m1), overload *)
E1 53 Coolant circulation pump (A31/1m1), overload **)
E1 56 Left duovalve (water value, A31/1y1, short *)
E1 57 Left duovalve (water value, A31/1y1, short **)
E1 58 Left duovalve (water value, A31/1y1, short or open *)
E1 59 Left duovalve (water value, A31/1y1, short or open **)
E1 60 Right duovalve (water value, A31/1y2, short *)
E1 61 Right duovalve (water value, A31/1y2, short **)
E1 62 Right duovalve (water value, A31/1y2, short or open *)
E1 63 Right duovalve (water value, A31/1y2, short or open **)
E1 64 Rear refrigerant shut-off valve (Y67, short *)
E1 65 Rear refrigerant shut-off valve (Y67, short **)
E1 66 Rear refrigerant shut-off valve (Y67, short or open *)
E1 67 Rear refrigerant shut-off valve (Y67, short or open **)
E1 68 Rear tunnel flap vacuum valve (Y67/1, short *)
E1 69 Rear tunnel flap vacuum valve (Y67/1, short **)
E1 70 Rear tunnel flap vacuum valve (Y67/1, short or open *)
E1 71 Rear tunnel flap vacuum valve (Y67/1, short or open **)

You might want to print it out.. It confuses the crap out of me when I try to do it...

Edited by Merc600sec 12/31/2004 1:13 PM

All I wish for Christmas is a smooth idle.
samosali is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W140 S-Class

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome