Network Message Chart - Module Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Engine Coolant Temperature Data | PCM | This message contains raw value from the engine coolant temperature. |
| Ambient air temperature filtered | PCM | This message contains filtered value from the ambient air temperature sensor. |
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Engine coolant temperature | PCM | This message contains raw value from the engine coolant temperature. |
| Ambient air temperature | PCM | This message contains raw value from the ambient air temperature sensor. |
Electric Booster Heater Operation (FHEV if equipped)
The electric booster heater ensures that the passenger compartment can be quickly warmed up when ambient temperatures are low. It is a heater element made up of ceramic resistors that is mounted in the climate control housing. It directly heats the airflow into the passenger compartment rapidly in the case of low ambient temperatures.
The current is switched via three electric booster heater relays located in the BCMC (also know as the BJB). The electric booster heater power and ground is supplied via a plug-in connection.
The HVAC control module sends a message to energizes the electric booster heater relays when the operating parameters have been met. The electric booster heater relays are activated or deactivated individually or together by the HVAC control module as needed.
Electric booster heater FHEV (if equipped) operating parameters:
- Engine is running
- HVAC controls have been switched to the warmer request temperature setting
- Engine coolant temperature is below approximately 75deg.C (167deg.F)
- Ambient air temperature is below approximately 12deg.C (53.6deg.F)
- Sufficient generator capacity is available
The electric booster heater is deactivated when an engine coolant temperature of approximately 85deg.C (185deg.F) or an ambient air temperature of approximately 15deg.C (59deg.F) is exceeded.