Description of parameters
The climate control system must be active for certain values to be updated.
Note. In the AUT position, the electronic climate control module governs functions which affect certain of the parameters listed below.
Signal description
All values listed below should be measured between the respective terminal in column 1 ( Terminal ) and ground unless stated otherwise in column 4 ( Other ).
Scheme 57
ECC control module connector #1-#30, correspond to terminals #1-#30 on the breakout box.
Note. It is important to connect the breakout box and check ground terminals before reading off.
| Terminal | Signal type | Voltage | Note |
|---|---|---|---|
| #1 | Power supply | Ubat | Ubat (battery voltage)= approximately 12 V. |
| #2 | Not connected. | ||
| #3 | Power ground | 0 V | |
| #4 | Input signal from speedometer | The frequency (between voltage periods) varies with the speed. | |
| #5 | Input signal from rheostat | 2-10 V | Voltage varies with rheostat control position. |
| #6 | Supply voltage to air distribution damper motor potentiometer | 5 V | |
| #7 | Positive output signal to the temperature damper motor | From 0 V to either +10 V or -10 V and back to 0 V | Variable voltage depending on the passenger compartment temperature equalization process. Voltage is cut after 12 seconds (becomes 0 V). NOTE: Voltage reading for terminals 7 and 8 are taken between terminals 7 and 8. Voltage reading for terminals 9 and 10 are taken between terminals 9 and 10. Voltage reading for terminals 11 and 12 are taken between terminals 11 and 12. |
| #8 | Negative output signal to temperature damper motor | ||
| #9 | Positive output signal to the air distribution damper motor | ||
| #10 | Negative output signal to the air distribution damper motor | ||
| #11 | Positive output signal to the recirculation damper motor | ||
| #12 | Negative output signal to the recirculation damper motor | ||
| #13 | Communication | Approximately 10 V | If no communication can be established. |
| #14 | Supply voltage to outside temperature sensor | 5 V | |
| #15 | Input signal from evaporator sensor | Approximately 2.5 V | At 20°C. (For taking readings at other temperatures, see Sensor characteristics ). |
| #16 | Reference voltage to the engine coolant temperature sensor | 5 V | |
| #17 | Input signal from the outside temperature sensor | Approximately 2.5 V | At 20°C. (For taking readings at other temperatures, see Sensor characteristics ). |
| #18 | Input signal from the engine coolant sensor | ||
| #19 | Input signal from the sun sensor | 5-300 mV | Voltage varies with sun intensity. |
| #20 | Input signal from the temperature potentiometer | Approximately 0.2-4.7 V | Varying voltage: approximately 0.2 V at maximum heat approximately 4.7 V at maximum cool. |
| #21 | Input signal from air distribution damper motor potentiometer | Approximately 0.25-4.5 V | Voltage varies with potentiometer position. |
| #22 | Reference voltage to the temperature damper motor potentiometer and evaporator sensor | 5 V | |
| #23 | Ground for the temperature and air distribution damper motor potentiometers and the sun sensor | 0 V | |
| #24 | Control signal heated rear window/door mirrors | 0 V/Ubat | Switch ON/switch OFF (Ubat (battery voltage) = approximately 12 V |
| #25 | Not connected. | ||
| #26 | Control signal for the fan relay for the condenser | Ubat | With fan activated. (Ubat (battery voltage) = approximately 12 V) |
| #27 | Signal (detection) from blower fan motor (on open-circuit, blocking or short-circuit) | Approximately 0.2-12 V | Voltage varies with blower fan speed selected: position AUTO= approximately 12 V position 0= approximately 12 V position 1= approximately 8 V position 2= approximately 6 V position 3= approximately 5 V position 4= approximately 2.5 V position 5= approximately 0.2 V. |
| #28 | Output signal to power unit | 0-approximately 1.7 V | Voltage varies with blower fan speed selected: position AUTO= approximately 0 V position 0= approximately 0 V position 1= approximately 1.3 V position 2= approximately 1.4 V position 3= approximately 1.5 V position 4= approximately 1.7 V position 5= approximately 0.9 V. |
| #29 | Output signal to blower fan relay | Approximately 0 V/Ubat | With blower fan switch in position 5 / all other positions. (Ubat (battery voltage) = approximately 12 V) |
| #30 | Signal (charging) from generator (GEN) D+ | Approximately 0.8 V (ignition on) approximately 13.7 V (engine running) | |
| NOTE |
|---|
| Voltage reading for terminals 7 and 8 are taken between terminals 7 and 8. Voltage reading for terminals 9 and 10 are taken between terminals 9 and 10. Voltage reading for terminals 11 and 12 are taken between terminals 11 and 12. |