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.
For further information about:
- connection of breakout box, see " Connecting breakout box, Climate Control Module (CCM)"
- checking the ground point, "Checking the voltage/ground connection, climate control module (CCM)".
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) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | t = | Time in seconds |
| PWM = | Pulse width modulated signal in % | - | - |
Signal table, climate control module (CCM) connector
| Terminal breakout box |
Terminal control module |
Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| #25 | #A1 | Signal, extended X-supply. Power supply, climate control module (CCM). | Ubat | Ubat | Powered via the relay from the central electronic module (CEM) |
| #26 | #A2 | Signal, fan diagnostics | U=0-Ubat | U=0-Ubat | - |
| #27 | #A3 | Signal, fan control | U=0-Ubat | U=0-Ubat | - |
| #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 | Ulow | Ulow | - |
| #38 | #A14 | - | - | - | - |
| #39 | #A15 | - | - | - | - |
| #40 | #A16 | Power ground | Ulow | Ulow | - |
Signal table, seat heating module (SHM) connector A
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| - | #A1 | Power ground | Ulow | Ulow | - |
| - | #A2 | LIN bus | Digital signal | Digital signal | Communication with the climate control module (CCM) |
| - | #A3 | - | - | - | - |
| - | #A4 | Power supply, seat heating module (SHM) | Ubat | Ubat | Powered via the central electronic module (CEM) |
Signal table, seat heating module (SHM) connector B
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| - | #B1 | Power supply, heating loop seat | Ubat | Ubat | - |
| - | #B2 | Signal, temperature sensor seat | - | - | - |
| - | #B3 | Signal ground, temperature sensor seat | - | - | - |
| - | #B4 | Power ground, heating loop seat | Ulow | Ulow | - |
Signal table, seat heating module (SHM) connector C
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| - | #C1 | Power ground, heating loop backrest | Ulow | Ulow | - |
| - | #C2 | Power supply, heating loop backrest | Ubat | Ubat | - |
Signal table, evaporator temperature sensor connector
| 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 | Ulow | Ulow | - |
Signal table, damper motor module (DMM) connector
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| - | #1 | Power supply | Ubat | Ubat | 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 | Ulow | Ulow | - |
SIGNAL TABLE, AIR QUALITY SENSOR (AQS) CONNECTOR (OPTION, ONLY ECC)
| Terminal breakout box | Terminal control module | Signal type | Ignition on | Idle | Other |
|---|---|---|---|---|---|
| - | #1 | Power supply | Ubat | Ubat | 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 | Ulow | Ulow | - |