Airmatic Control Unit, Component Description - GF32.22-P-5109GR
MODEL 166 up to model year 2016 with CODE 489 (AIRMATIC)
Illustrated on model 166.0
Location
The AIRmatic control unit is installed in the front left footwell.
Tasks
The AIRmatic control unit has the following tasks:
- Reading in of signals
- Evaluation of input factors
- Actuation of components
Reading in of signals
The input factors are read in via the following connections:
- Direct lines
- Chassis CAN 1 (CAN E1)
Direct lines
The following components are read in via direct lines:
- Circuit 30g (switched battery positive)
- Circuit 31
- Left rear level sensor (B22/7)
- Left front level sensor (B22/8)
- Right front level sensor (B22/9)
- Right rear level sensor (B22/10)
- AIRmatic pressure sensor (Y36b1)
Chassis CAN 1
The AIRMATIC control unit is a subscriber of chassis CAN 1 and receives signals from the following control units, for example:
- Lower control panel control unit (N72), via the center console switch LIN (LIN B12), the SAM control unit (N10), the interior CAN (CAN B) and the electronic ignition lock control unit (N73) the status of the Comfort/Sport (ADS) button (N72s36) (except CODE 430 (On-road & off-road package)), the vehicle level button (N72s35) (except CODE 430 (On-road & off-road package)) or the vehicle level rotary switch (N72s39) (with code 430 (On-road & off-road package))
- Off-road control panel control unit (N72/3) (with code 430 (On-road & off-road package)), via the center console switch LIN, the SAM control unit, the interior CAN, the electronic ignition lock control unit, chassis CAN 1 and the ME-SFI [ME] control unit (N3/10) (with gasoline engine) or CDI control unit (N3/9) (with diesel engine) the status of the off-road package transmission mode control (N72/3s1) (with CODE 430 (On-road & off-road package))
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the affected components are then actuated.
Actuation of components
Components are actuated with the following lines:
- Direct lines
- Chassis CAN 1
Direct lines
The following components are actuated via direct lines:
- AIRmatic pressure reduction valve (A9/1y1)
- AIRmatic relay (F58kT)
- Left front level control valve (Y36y1)
- Right front level control valve (Y36y2)
- Left rear level control valve (Y36y3)
- Right rear level control valve (Y36y4)
- AIRmatic central reservoir charge valve (Y36y5)
- Left front axle damping valve unit (Y51)
- Right front axle damping valve unit (Y52)
- Left rear axle damping valve unit (Y53)
- Right rear axle damping valve unit (Y54)
Chassis CAN 1
The AIRmatic control unit is a station on chassis CAN 1 and sends signals to, for example, the following control units:
- Instrument cluster (A1), via the electronic ignition lock control unit and chassis CAN 2 (CAN E2)
- Active roll stabilization control unit (N51/6)
| Technical data Designation | Unit | Values | Tolerance range | Remarks |
|---|---|---|---|---|
| AIRMATIC control unit | ||||
| Voltage supply | V | 13 | - | - |
| Voltage limits | V | 10 | - | Lower limit value |
| V | 16 | - | Upper limit value | |
| Power consumption | A | 0.1 | - | Standby |
| A | 0.7 | - | Action | |
| mA | < 0.1 | - | No-load current | |
| Reverse polarity protection | - | - | - | Yes |
| Additional specific parameters | - | - | - | All inputs and outputs are designed to be short-circuit-proof with respect to the ground connection and the onboard electrical system voltage. |
| Special features | - | - | - | The AIRmatic control unit can withstand a voltage of U = 18 V for t = 60 min. and a voltage of U = 27 V for t = 60 s. |
| Flash capability/coding capability | - | - | - | Yes/yes |
| Left front level sensor, right front level sensor, left rear level sensor, right rear level sensor | ||||
| Measured variable | - | - | - | Angles |
| Measuring range | ° | ±35 | - | About center position |
| Supply voltage | V | 5 | ±0.05 | - |
| Total power consumption | mA | 7.5 | - | - |
| Switch-on power consumption | mA | 40 | - | For t = 5 μs |
| Rated sensitivity | mV/° | 57.14 | - | - |
| Switch-on delay | ms | < 100 | - | - |
| Load resistance | _____________ _____kΩ |
10 | - | To signal ground (in AIRmatic control unit) |
| Load capacitance | nF | ≤ 22 | - | To signal ground (in AIRmatic control unit) |
| AIRMATIC pressure sensor | ||||
| Measured variable | - | - | - | Pressure |
| Measuring range | bar | 0...35 | - | - |
| Supply voltage | V | 5 | ±0.25 | - |
| Power consumption | mA | ≤ 12 | - | - |
| Switch-on power consumption | - | - | - | No increased switch-on power consumption |
| Output current | mA | ≤ 1.2 | - | Sensor is current sink |
| Load resistance | _____________ _____kΩ |
≤ 4.7 | - | To sensor voltage (in the AIRMATIC control unit) |
| Temperature range | °C | -40...120 | - | - |
| Left front level control valve Right front level control valve Left rear level control valve Right rear level valve | ||||
| Rated voltage | V | 7.5...15 | - | - |
| Rated resistance | Ω | 6.8 | ±7% | At T = 20 °C |
| Switching/holding current | A | 1 | - | Current regulation by AIRmatic control unit |
| Push current | A | < 2 | - | For t = 200 ms |
| Valve inductance | mH | 23.2 | ±20% | - |
| Frequency of pulse width modulation | Hz | ≈ 1000 | - | - |
| Function | - | - | - | Normally closed |
| Temperature range | °C | -40...120 | - | - |
| Protection system | - | - | - | IP6K6/IP6K7 |
| AIRMATIC relay | - | - | ||
| Rated voltage | V | 12 | - | - |
| Winding resistance | Ω | 66.3...89.7 | At T = 23 °C | |
| Inductance | mH | 520 | - | At f = 1 kHz, armature open |
| mH | 1500 | - | At f = 1 kHz, armature closed | |
| Pull-in current | A | 0.13 | ±3 % | At T = 23 °C |
| Pull-in voltage | V | ≤ 7.2 | - | At T = 23 °C |
| Drop-out voltage | V | ≥ 1.6 | - | At T = 23 °C |
| Release voltage peak | V | ≤ 80 | - | - |
| Pull-in time | ms | ≤ 10 | - | At U = 12 V |
| Release time | ms | ≤ 10 | - | - |
| Continuous load current (working contact) | A | 70 | - | - |
| AIRMATIC pressure reduction valve | ||||
| Rated voltage range | V | 7.5...16 | - | - |
| Rated resistance | Ω | 14.9...16.5 | - | At T = 20 °C |
| Switching/holding current | A | 0.39 | - | - |
| Inductance | mH | 85 | - | - |
| Frequency of PWM | Hz | ≈ 1000 | - | - |
| Pull-in time | ms | ≤ 50 | - | - |
| Release time | ms | ≤ 50 | - | - |
| Function | - | - | - | Normally closed |
| Temperature range | °C | -40...80 | - | - |
| AIRMATIC central reservoir filling valve | ||||
| Rated voltage range | V | 7.5...15 | - | - |
| Rated resistance | Ω | 6.8 | ±7 % | At T = 20 °C |
| Switching/holding current | A | 0.6 | - | Current regulation by AIRmatic control unit |
| Push current | A | < 1.35 | - | For t = 200 ms |
| Valve inductance | mH | 23.2 | ±20 % | - |
| Frequency of PWM | Hz | ≈ 1000 | - | - |
| Temperature range | °C | -40...120 | - | - |
| Protection system | - | - | - | IP6K6/IP6K7 |
| Left front axle damping valve unit, right front axle damping valve unit, left rear axle damping valve unit, right rear axle damping valve unit | ||||
| Coil resistance | Ω | 4.7 | ±0.2 | At T = 23 °C ±5 °C |
| Maximum current | A | 1.6 | - | - |
| Inductance | mH | 8.1 | - | At f = 1 kHz |
| Coil temperature | °C | -40...180 | - | - |
| PWM carrier frequency | kHz | 2 | - | - |
| Wiring diagram of AIRmatic control unit | PE32.22-P-2101-97NAA |