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. For further information about these, see the wiring diagram.
| 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 70
| 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 71
| 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 72
| 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 73
| 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-441129-S41520739722011121500000)
- For connector B, see «Signal description, climate control module (CCM), Connector B»(ref-441129-S42835288952011121500000)
- For connector C, see «Signal description, climate control module (CCM), Connector C»(ref-441129-S09865142162011121500000).
See also:
• Signal specification