Unified Meter and A/C Amp

UNIFIED METER AND A/C AMP

System Description




- For the unified meter and A/C amp., the signal required for controlling the combination meter and triple meter are integrated in the A/C auto amp.
- Unified meter and A/C amp. controls each operation for A/C auto amp. For information regarding A/C control, refer to "AIR CONDITIONER CONTROL" in "ATC" section.
- Unified meter and A/C amp. inputs necessary information for combination meter and triple meter from each unit by CAN communication and so on.
- And unified meter and A/C amp. outputs these signals using communication line (TX, RX) between unified meter and A/C amp. and various meters.
- In addition to sending output to the combination meter and triple meter containing the signals input from the various units, it also receives the signals between the combination meter and triple meter.
- Other input signals are also sent to the ECM, TCM, and BCM using CAN communication.
- The signals required for the trip computer display are centralized in the unified meter and A/C amp., converted into data, and sent to the triple meter.
- The unified meter and A/C amp. correspond a CONSULT-II function (self-diagnostic results, CAN diagnostic support monitor, data monitor).

INPUT/OUTPUT SIGNALS




Between Unified Meter and A/C Amp. and Combination Meter




Between Unified Meter and A/C Amp. and Triple Meter

FAIL-SAFE




Solution When Communication Error Between Unified Meter and A/C Amp. and Combination Meter




Solution When Communication Error Between Unified Meter and A/C Amp. and Triple Meter

CAN Communication System Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

CAN Communication Unit
Refer to "Information Bus" in "LAN SYSTEM".