Distronic

Radar

Name: ART2 B (aka Distronic Plus), "ART210", DTR2

Mercedes part ID: A89 (A89b1 DTR Radar Sensor and A89n1 DTR Control Module integrated in single unit)

This device has only a single connector. This connector is close to VEMO V99-83-0013, but you have to cut the plastic to fit. On older models (ART1), a secondary unit is required and is has a coaxial cable running to it. The plug this coaxial cable is connected to, is used as a venting hole on ART2 / DTR2. Its a much more complex system, check W220 wiki for more information.

Connector 1:

• A2105403681 "6-PIN MQS;B29"
• Replacement/self built: VEMO V99-83-0013
• Pinout:
  1. 0.5 RedGreen: Circuit 87 (POWER)
  2. Not Connected
  3. Not Connected
  4. 0.5 GreenWhite: CAN-C High
  5. 0.5 Green: CAN-C Low
  6. 0.75 Brown: GROUND

Fitment:

• W219 (CLS)
• W211 (E), mounted with reflector (might need reflector to work properly?)
• W230 (SL)

P/N (PLEASE CHECK FOR MISSING COAXIAL PLUG, OTHERWISE ITS ART1):

P/N	ART	EPC Note
W219 CLS and W230 SL
A0005408817	1	W230 ONLY, until 28/05/2004
A2305400917		W219: until 31/10/2007, W230: from 30/07/2004, replaced by 1417
A2305401417		W219: until 31/10/2007, W230: from 30/07/2004, replaced by 1717
A2305401717		W219: until 31/10/2007, W230: from 30/07/2004, replaced by 1817
A2305401817		W219: until 31/10/2007, W230: from 30/07/2004
A2305400062		W219: 31/10/2007 and up, W230: from 30/07/2004, replaced by 0162
A2305400162	2	W219: 31/10/2007 and up, W230: from 30/07/2004
W211 E (Mounting with reflector)
A2115400617	1
A2115401417	2

Compatibility:

- R170 has no ZGW/CGW

- No mounting frame

- No K-Line, wire directly onto CAN

Fuse: 7.5A

CAN Opcodes

CAN ID	Description
0x0254	A1 - Main status
0x025C	A2 - Object 1 info
0x0260	A3 - Object 2 info
0x0264	A4 - Object 3 info
0x0268	A5 - Object 4 info

Distronic documentation on W220 wiki https://w220.wiki/Distronic

Initialization

Bootup phase is about 30 seconds. The device needs to detect some particular frame in order to not deem itself faulty.

Communication

N47-5 (ESP, BAS control unit):

Note: W209/215/220 have a different interface compared to W211/219/230, they have a different connector. (TODO: Figure out what it is)

• DTR controls engine and braking torque interface of ESP unit.
• ESP/BAS -> DTR
  • Left front, right front, left rear, right rear wheel speeds
  • Steering angle (0 to 720 degrees)
  • Steering angle sign (right/left)
• ESP/BAS <- DTR:
  • Distronic error
  • Target evaluation (distance to it, relative speed, angle, radar lobe orientation, strength of the reflected radar beams)

N93 (Central Gateway control unit):

• Lower control panel (N72) -> CAN-B through N93 -> CAN-C DTR
  • DTR switch OFF or ON (proximity warning function)
  • Specification from the DTR distrance potentiometer

N80 (Steering column module):

• ESP/BAS <- Steering column module:
  • Pushbuttons OFF / SET MEMORY / SET ACCELERATION / SET DELAY
  • Variable speed limiter ON/OFF (except USA and Japan)
  • Cruise control switch implausible
  • Steering angle (from 0 to 720 degrees)
  • Steering angle sign (right/left)
  • Steering angle sensor defective

A1 (Instrument cluster)

• ESP/BAS <- Instrument cluster:
  • MPH instead of KMH (variable speed limitation)
  • Winter tire maximum speed
• ESP/BAS -> Instrument cluster:
  • Distronic distance warning lamp
  • Distronic warning tone
  • Recognition of a stationary object (e.g. stationary vehicle)
  • Switch display to Distronic display
  • Distronic switched on (no vehicle ahead)
  • Speedometers
  • Switch Distronic segment display on
  • Vehicle detected ahead
  • Distronic switched on (Proximity control active)
  • LIMIT in display (except USA, Japan)
  • Distronic Error

TCU (Transmission control unit):

• BAS/ESP <- TCU
  • Actual gear
  • Target gear
  • Kick-down
  • Transmission code
  • Transmission emergency running mode
• BAS/ESP -> TCU
  • Shift curve offset
  • Suppression of dynamic full load position
  • Maintain gear position
  • Active downshift required

ECU (PCM)

• BAS/ESP <- ECU
  • Vehicle code
  • Adjusted engine torque for traction control
  • Engine speed
  • Minimum and maximum engine torque, engine drag torque
  • Kickdown recognition
  • Deceleration fuel shutoff
• BAS/ESP -> ECU
  • Reduction or increase of the engine nominal torque