Siemens MS45 CAN Bus (CAN11h)

MS45 can operate in two different CAN bus modes. CAN11h and BN2000. This page describes CAN11h which is also used in MS43/MS42 and compatible with those. CAN11h works in 500kb/s baud rate.

Siemens MS45 reads the following messages for operation, if the corresponding module is present in car:

• ARBID 0x43F EGS1 Automatic Transmission
• ARBID 0x??? EGS2 Automatic Transmission
• ARBID 0x613 ICL2 Instrument Cluster
• ARBID 0x615 ICL3 Instrument Cluster
• ARBID 0x153 ASC1 Traction Control
• ARBID 0x1F3 ASC3 Traction Control
• ARBID 0x1F8 ASC4 Traction Control
• ARBID 0x43D AMT1 Automatic Manual Transmission
• ARBID 0x1F5 LWS1 Steering Angle Sensor

Siemens MS45 sends the following messages:

• ARBID 0x316 DME1 Engine Control Unit
• ARBID 0x329 DME2 Engine Control Unit
• ARBID 0x338 DME3 Engine Control Unit
• ARBID 0x545 DME4 Engine Control Unit

In addition to that, there are several messages that are not used by the ECU, but still present on the CAN Bus:

• ARBID 0x1F0 ASC2 Traction Control
• ARBID 0x445 TXU1 Transfer Case Unit
• ARBID 0x610 ICL1 Instrument Cluster

DME1 0x316

Refresh Rate: 10ms

• Byte 0 - Bitfield
  • Bit 0 - LV_SWI_IGK

    Ignition Key Voltage State

    0 = terminal 15 off detected

    1 = terminal 15 on detected

  • Bit 1 - LV_F_N_ENG

    Crankshaft Sensor State

    0 = no CRK error present

    1 = CRK error present

  • Bit 2 - LV_ACK_TCS

    Traction Control State

    0 = either ASC1 was not received within the last 500 ms or it contains a plausibility error

    1 = the ASC message ASC1 was received within the last 500 ms and contains no plausibility errors of the requirements TQI_ASR_CAN / TQI_MSR_CAN

  • Bit 3 - LV_ERR_GC

    Gear Change Error State

    0 = gear change not or partly possible

    1 = gear change possible

  • Bit 4 - SF_TQD [0]
  • Bit 5 - SF_TQD [0]

    Charge Intervention State

    0 = the required intervention can be performed completely or if there is no ASC requirement.

    1 = the required intervention cannot be performed completely because the IGA retard limit is reached.

    2 = the required intervention cannot be performed completely because the charge actuators are fully closed (this case is not possible with MTC without break-away mechanism)

    3 = "limited vehicle dynamics" is active (MTC/ISA error)

  • Bit 6 - Unused
  • Bit 7 - LV_F_SUB_TQI

    MAF Error State

    0 = MAF ok

    1 = MAF error present

• Byte 1 - TQI_TQR_CAN

  Indexed Engine Torque in % of C_TQ_STND (including ASR/MSR/ETCU/LIM/AMT/GEAR intervention)

  Calculation = HEX * 0.39

• Byte 2 - N_ENG [LSB]
• Byte 3 - N_ENG [MSB]

  Engine Speed in rpm

  Calculation = ((HEX[MSB] * 256) + HEX[LSB]) * 0.15625

• Byte 4 - TQI_CAN

  Indicated Engine Torque in % of C_TQ_STND (based on PVS, N, AMP, TIA ,TCO, IGA, PUC so ip_tqi_pvs__n__pvs)

  Calculation = HEX * 0.39

• Byte 5 - TQ_LOSS_CAN

  Engine Torque Loss (due to engine friction, AC compressor and electrical power consumption) in % of C_TQ_STND

  Calculation = HEX * 0.39

• Byte 6 - Bitfield
  • Bit 6 - ERR_AMT_CAN
  • Bit 7 - ERR_AMT_CAN
• Byte 7 - TQI_MAF_CAN

  Theorethical Engine Torque in % of C_TQ_STND after charge intervention (based on MAF & IGA so ip_tqi_maf__n__maf)

  Calculation = HEX * 0.39

DME2 0x329

Refresh Rate: 10ms

• Byte 0 - Multiplexed Information
  • Bit 0 - MUX_INFO [0]
  • Bit 1 - MUX_INFO [1]
  • Bit 2 - MUX_INFO [2]
  • Bit 3 - MUX_INFO [3]
  • Bit 4 - MUX_INFO [4]
  • Bit 5 - MUX_INFO [5]

    CAN_LEVEL = CAN bus function level. This is always 0x11 for MS43

    OBD_STEUER = STATE_DIAG_GS (Status of GS diagnosis for feedback to gearbox)

    MD_NORM = Refactored C_TQ_STND from 0x3FF (0-1023Nm) to 0x3F (0-1008Nm) with decreased resolution of 16Nm

  • Bit 6 - MUX_CODE [0]
  • Bit 7 - MUX_CODE [1]

    0 = CAN_LEVEL

    2 = OBD_STEUER

    3 = MD_NORM

• Byte 1 - TEMP_ENG

  Engine (Coolant) Temperature in °C

  Calculation = (HEX * 0.75) - 48°C

  Init: 0xFF

  Min: 0x01 (-48°C)

  Max: 0xFF (142.5°C)

• Byte 2 - AMP_CAN

  Ambient Pressure in hPa

  Calculation = (HEX * 2) + 598hPa

  Init = 0x00

  Min = 0x01 (600hPa)

  Max = 0xFE (1106hPa)

  Error = 0xFF

• Byte 3 - Bitfield
  • Bit 0 - LV_SWI_CLU

    Clutch Switch State

    0 = released

    1 = depressed

  • Bit 1 - LV_LEVEL_IS

    Idle Regulator State

    0 = idle above threshold

    1 = idle below threshold

  • Bit 2 - LV_ACK_CRU_AD_ECU

    Acknowledge of ACC1 CAN Message

    0 = nACK

    1 = ACK

  • Bit 3 - LV_ERU_CAN

    Engine Running State

    0 = engine stopped

    1 = engine running

  • Bit 4 - (STATE_CRU_CAN)???
  • Bit 5 - STATE_MSW_CAN [0]
  • Bit 6 - STATE_MSW_CAN [1]
  • Bit 7 - STATE_MSW_CAN [2]

    0 = No Button Pressed (Init Value)

    1 = Set / Acceleration (tip-up)

    2 = Deceleration (tip-down)

    3 = Resume

    4 = Deactivate (I/O)

    7 = Error Condition

• Byte 4 - TPS_VIRT_CRU_CAN

  Calculation = HEX * 0.390625

• Byte 5 - TPS_CAN

  Accelerator Pedal Position in % of PVS_MAX

  Calculation = HEX * 0.390625

  Init = 0x00

  Min = 0x01 (0%)

  Max = 0xFE (99.2%)

  PVS Error = 0xFF

• Byte 6 - Bitfield
  • Bit 0 - LV_BS

    Brake Switch State

    0 = brake not actuated

    1 = brake actuated

  • Bit 1 - LV_ERR_BS

    Brake Switch System State

    0 = brake switch system OK

    1 = brake switch system faulty

  • Bit 2 - LV_KD_CAN

    Kick Down State

    0 = kick down not active

    1 = kick down active

  • Bit 3 - STATE_CRU_CAN [0]
  • Bit 4 - STATE_CRU_CAN [1]
  • Bit 5 - STATE_CRU_CAN [2]

    0 = LV_CRU_ACT = 0

    1 = LV_CRU_ACT = 1, constant drive (or tip-up / tip-down)

    3 = LV_CRU_ACT = 1, resume

    5 = LV_CRU_ACT = 1, set / acceleration

    7 = LV_CRU_ACT = 1, deceleration

  • Bit 6 - REQ_SHIFTLOCK [0]
  • Bit 7 - REQ_SHIFTLOCK [1]

    0 = no actuation is active

    3 = actuation ISA, MTC or N_SP_IS is active

• Byte 7 - Unused

DME3 0x338

Refresh Rate: 1000ms and at signal change

• Byte 0 - Unused
• Byte 1 - Unused
• Byte 2 - STATE_SOF_CAN

  Sport Button Status

  0 = Sport Button On (requested by SMG)

  1 = Sport Button Off

  2 = Sport Button On

  3 = Sport Button Error

  Init: 0x01

• Byte 3 - Unused
• Byte 4 - Unused
• Byte 5 - Unused
• Byte 6 - Unused
• Byte 7 - Unused

DME4 0x545

Refresh Rate: 10ms

• Byte 0 - Bitfield
  • Bit 0 - Unused
  • Bit 1 - LV_MIL - Check Engine Light
  • Bit 2 - Unused
  • Bit 3 - LV_MAIN_SWI_CRU - CRU_MAIN_SWI
  • Bit 4 - LV_ETC_DIAG - EML Light
  • Bit 5 - Unused
  • Bit 6 - LV_FUC_CAN - Fuel Tank Cap Light
  • Bit 7 - Unused
• Byte 1 - FCO[LSB]
• Byte 2 - FCO[MSB]

  Fuel Consumption

• Byte 3 - Bitfield
  • Bit 0 - Oil Level Indicator LED - Oil consumption
  • Bit 1 - Oil Level Indicator LED - Oil loss
  • Bit 2 - Oil Level Indicator LED - Sensor malfunction
  • Bit 3 - LV_TEMP_ENG - Coolant Overheating Light (c_tco_tmot_sta)
  • Bit 4 - M-Cluster Warm-Up LEDs
  • Bit 5 - M-Cluster Warm-Up LEDs
  • Bit 6 - M-Cluster Warm-Up LEDs
  • Bit 7 - Upshift indicator
• Byte 4 - TOIL_CAN

  Oil Temperature in °C

  Calculation = HEX - 48°C

  Min: 0x00 (-48°C)

  Max: 0xFE (206°C)

• Byte 5 - Bitfield
  • Bit 0 - Battery Chargelight (Alpina Roadster Only)
  • Bit 1 - Unused
  • Bit 2 - Unused
  • Bit 3 - Unused
  • Bit 4 - Unused
  • Bit 5 - Unused
  • Bit 6 - Unused
  • Bit 7 - Unused
• Byte 6 - Oil Level (MSS54HP only)

  Calculation = (HEX - 158) / 10L

  Min: 0x80 || 0xC0 (-3.0L)

  Max: 0xBE || 0xFE (+3.2L)

• Byte 7 - Bitfield
  • Bit 0 - State Tire Pressure (MSS54 only)
  • Bit 1 - Unused
  • Bit 2 - Unused
  • Bit 3 - Unused
  • Bit 4 - Unused
  • Bit 5 - Unused
  • Bit 6 - Unused
  • Bit 7 - Status Engine Oil Pressure Low