Signal specification
General
All the values given below are between the terminals stated in column 1 and terminal #A16 in column 2 (signal ground). This applies unless otherwise indicated in brackets.
Note. It is important to connect the breakout box and check the ground terminals before taking readings.
There may be several connections and connectors between the control module and components.
| U = | DC voltage in volts (V) | U AC = | AC voltage in volts (V) |
|---|---|---|---|
| U bat = | Battery voltage (V) | F = | Frequency in Hertz (Hz) |
| U low = | Voltage approximately 0 V | T = | Time in seconds |
| PWM = | Pulse width modulated signal in % |
Scheme 626
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| #25 | #A1 | Signal, extended X-supply. Power supply, climate control module (CCM). | U bat | U bat | Powered via the relay from the central electronic module (CEM) |
| #26 | #A2 | Signal, fan diagnostics | U=0-U bat | U=0-U bat | |
| #27 | #A3 | Signal, fan control | U=0-U bat | U=0-U bat | |
| #28 | #A4 | ||||
| #29 | #A5 | Signal, evaporator temperature sensor | U=0.2-4.8 V | U=0.2-4.8 V | Temperature dependent |
| #30 | #A6 | ||||
| #31 | #A7 | LIN bus 2 | Digital signal | Digital signal | Communication with components, LIN bus 2 |
| #32 | #A8 | CAN L1 | Digital signal | Digital signal | |
| #33 | #A9 | CAN L2 | Digital signal | Digital signal | |
| #34 | #A10 | CAN H1 | Digital signal | Digital signal | |
| #35 | #A11 | CAN H2 | Digital signal | Digital signal | |
| #36 | #A12 | LIN bus 1 | Digital signal | Digital signal | Communication with components, LIN bus 1 |
| #37 | #A13 | Signal ground, evaporator temperature sensor | U low | U low | |
| #38 | #A14 | ||||
| #39 | #A15 | ||||
| #40 | #A16 | Power ground | U low | U low |
Signal table, climate control module (CCM) connector
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| #A1 | Power ground | U low | U low | ||
| #A2 | LIN bus | Digital signal | Digital signal | Communication with the climate control module (CCM) | |
| #A3 | |||||
| #A4 | Power supply, seat heating module (SHM) | U bat | U bat | Powered via the central electronic module (CEM) |
Signal table, seat heating module (SHM) connector A
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| #B1 | Power supply, heating loop seat | U bat | U bat | ||
| #B2 | Signal, temperature sensor seat | ||||
| #B3 | Signal ground, temperature sensor seat | ||||
| #B4 | Power ground, heating loop seat | U low | U low |
Signal table, seat heating module (SHM) connector B
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| #C1 | Power ground, heating loop backrest | U low | U low | ||
| #C2 | Power supply, heating loop backrest | U bat | U bat |
Signal table, seat heating module (SHM) connector C
Scheme 627
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| #1 | Signal, evaporator temperature sensor | 0.2-4.8 V | 0.2-4.8 V | Temperature dependent | |
| #2 | |||||
| #3 | Signal ground | U low | U low |
Signal table, evaporator temperature sensor connector
Scheme 628
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| #1 | Power supply | U bat | U bat | Powered via the relay on the central electronic module (CEM) | |
| #2 | LIN bus | Digital signal | Digital signal | Communication with the climate control module (CCM) | |
| #3 | Power ground | U low | U low |
Signal table, damper motor module (DMM) connector
Scheme 629
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| #1 | Power supply | U bat | U bat | Powered via the relay on the central electronic module (CEM) | |
| #2 | LIN bus | Digital signal | Digital signal | Communication with the climate control module (CCM) | |
| #3 | Power ground | U low | U low |
Signal table, air quality sensor (AQS) connector (option, only ECC)
- For connector A, see «Signal description, climate control module (CCM), Connector A»(ref-451737-S24106406152012020900000)
- For connector B, see «Signal description, climate control module (CCM), Connector B»(ref-451737-S16363027962012020900000)
- For connector C, see «Signal description, climate control module (CCM), Connector C»(ref-430956-S05758093212011101900000) .
General
All values given below are between the respective terminal in column 1 and terminal #3 (power ground) unless otherwise stated in brackets after the entry. Control module terminals #1-#16 correspond to terminals #1-#16 on the breakout box.
Note. It is important to connect the breakout box and check the ground terminals before taking readings.
| U= | DC voltage in volts (V) | U AC = | AC voltage in volts (V) |
|---|---|---|---|
| U bat = | Battery voltage (V) | F = | Frequency in Hertz (Hz) |
| U low = | Voltage approximately 0 V | % duty = | Duty cycle (pulse ratio) as a percentage (%) |
| T = | Time in milliseconds (ms) |
| Terminal | Signal type | Ignition on | Engine idling | Other |
|---|---|---|---|---|
| #1 | Glow plug signal | Glow plug off: U=U low Glow plug on: Pulse ratio (% duty) > 0% | Pulse ratio (% duty) increases with glow plug intensity. | |
| #2 | ||||
| #3 | Power ground (Measured to the battery negative terminal) | U low | ||
| #4 | Signal ground, engine coolant temperature sensor and flame sensor | U low | ||
| #5 | ||||
| #6 | Communication cable for the central electrical module (CEM) | Digital signal | ||
| #7 | ||||
| #8 | Flame sensor signal | Flame not lit: Uapprox.5 V Flame lit: U<1.5 V | ||
| #9 | 30-supply (Power supply from battery) | U bat | ||
| #10 | Combustion fan control signal | Combustion fan off and power supply off: U low Combustion fan off and power supply on: U bat Fan on: Pulse ratio (% duty) > 0% | The pulse ratio (% duty) increases with fan speed. | |
| #11 Model year -2001 | Power supply, combustion fan, fuel pump (FP) and water pump | Power supply off: U low Power supply on: U bat | ||
| #11 Model year 2002 | Power supply, combustion fan and water pump | Power supply off: U low Power supply on: U bat | ||
| #12 | Water pump control signal | Water pump off and power supply off: U low Water pump off and power supply on: U bat Water pump on and power supply on: U low | ||
| #13 | Fuel pump control signal | Fuel pump off: f=0 Hz Fuel pump on: f>0 Hz | The frequency increases with pump speed | |
| #14 | ||||
| #15 | Extended X-supply | U bat | U bat | |
| #16 | Coolant temperature sensor signal | +20°C: Uapprox.3.5 V +75°C=2.02V +90°C=0.78V | The voltage decreases with increasing temperature | |