A/C Pushbutton Control Module (N22) (83/84)

Publication date: 1996-05-01
Reference number: 83/84

A/C PUSHBUTTON CONTROL MODULE (N22)

TECHNICAL SERVICE BULLETIN

Reference Number(s): 83/84, Date of Issue: May 1996

MODELS 140 AND 202 AS OF SEPTEMBER 1995, MODEL 210; A/C PUSHBUTTON CONTROL MODULE (N22)

Model(s): 1996-on Mercedes-Benz S 320, S 420, S 500, S 600, C 220, C 280, C 36, E 300, E 320, E 420

Group: 83 - Climate Control

Bulletin No.: 83/84

Date: May 1996

BULLETIN ILLUSTRATION LIST

Fig 1: Directional Flow Of Control Signals

Fig 2: Pushbutton Control Display

A. MODIFICATIONS TO A/C PUSHBUTTON CONTROL MODULES

Models 140 and 202 for model year 1996, produced as of September 1995 and model 210 since start of production; A/C pushbutton control module (N22) is equipped with a serial interface (K1). As of November 1995, all replacement pushbutton control modules (N22) are equipped with a serial interface (K1), that will be required in the forth coming model applications (refer to subject B ).

PARTS INFORMATION

Refer to table below for application of part numbers.

PARTS INFORMATION

Model

Previous Part Number

New Part Number

210 with activated charcoal filter

210 830 07 85 ⁽¹⁾

210 830 22 85 ⁽¹⁾

140 with activated charcoal filter

210 830 05 85 ⁽¹⁾ (Used in production only)

140 830 23 85 ⁽¹⁾

140 without activatedcharcoal filter

210 830 04 85 ⁽¹⁾ (Used in production only)

140 830 24 85 ⁽¹⁾

202

Unchanged, equipped with serial interface K1 since September 1995.

⁽¹⁾	= Perform version coding using the HHT (refer to subject C ).

NOTE: The new pushbutton control modules can be installed in model year 1996 models 140 and 202 built Prior to September 1995.

B. SERIAL INTERFACE, INSTRUMENT CLUSTER (A1)

Serial interface (K1): data link from instrument cluster (A1) to pushbutton control module (N22)

Model 202 in instrument cluster (A1), as of September 1995.
Model 210 in instrument cluster (A1), with start of production.
Model 140 not available in instrument cluster at this time.

NOTE: Arrows shown in Fig. Fig 1 indicate direction of information or control signals.

The following signals are transferred via the serial interface K1:

Outside air temperature, engine coolant temperature, Vehicle speed, engine speed (RPM), instrument cluster illumination (circuit 58d), °F/°C, fuel safety shut-off (diesel engines), acceleration recognition (gasoline engines).

C. VERSION CODING PROCEDURE WHEN REPLACING PUSHBUTTON CONTROL MODULES

MODELS 202 AND 210

The engine version is automatically transferred from the instrument cluster (A1) by the serial interface (K1) to the pushbutton control module (N22). Other version coding is done using the HHT as described in subject D .

MODEL 140

Version coding is done using the HHT as described under subject D .

NOTE: The pushbutton control modules (for model 140) are shipped from the parts distribution centers (PDC's) with the following settings:

Model 140 with °C active
Engine 104 active
Smog sensor: with activated charcoal filter active
"Smog" readout (a, Fig. Fig 2 ) in pushbutton display inactive (switched off)
Refrigerant fill level check: active
Auxiliary fan (M4): active
Blower motor speed level bar display (not displayed in "AUTO" mode).

D. VERSION CODING USING THE HAND-HELD TESTER (HHT)

NOTE: The following tables describe version coding using the HHT, the actual HHT screen display may vary. When performing version coding follow HHT screen prompts as indicated.

Fig 3: VERSION CODING TABLE