ADDITIONAL HEATER - Functional description
- Make
- Alfa Romeo
- Model
- 147 Factory Service Manual
- Year
- 2000–2004
- Section
- Climate control system › ADDITIONAL HEATER - Functional description
ADDITIONAL HEATER - Functional description
Functional description
The relay T8 of the engine compartment junction unit B1 controls the circuit for engaging the first resistance for the additional heater.
The relay supply arrives from the line of maxifuse CVM located on the battery, connector B99, via the line of special fuse F8 of engine bay control unit B1.
The supply for the coil for relay T8 arrives from the line controlled by the ignition (INT/A) protected by fuse F31 of the junction unit under the dashboard B2.
The climate control unit M70 sends the enabling signal for engaging the first resistance O25A from pin 8: this signal energizes relay T8 of control unit B1.
The relay J36 controls the engagement of the other two resistances for the additional heater.
The supply for relay arrives from the line for maxifuse PTC2, located on the battery, connector B99.
The climate control unit M70 sends a signal for enabling the engagement of the two resistances O25B and O25C from pin 9: this signal energizes the relay J36.
Functional description
The relay T8 of the engine compartment junction unit B1 controls the circuit for engaging the first resistance for the additional heater.
The relay supply arrives from the line of maxifuse CVM located on the battery, connector B99, via the line of special fuse F8 of engine bay control unit B1.
The supply for the coil for relay T8 arrives from the line controlled by the ignition (INT/A) protected by fuse F31 of the junction unit under the dashboard B2.
The climate control unit M70 sends the enabling signal for engaging the first resistance O25A from pin 23: this signal energizes relay T8 of control unit B1.
The relay J36 controls the engagement of the other two resistances for the additional heater.
The supply for relay arrives from the line for maxifuse PTC2, located on the battery, connector B99.
The climate control unit M70 sends a signal for enabling the engagement of the two resistances O25B and O25C from pin 22: this signal energizes the relay J36.
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