PTC HEATER CONSTRUCTION [MANUAL AIR CONDITIONER]
id0740a2106500
Outline
• The PTC heater is supplementary heater to assist A/C unit heating performance.
System Wiring Diagram
System Block Diagram
Operation
• When the climate control unit detects that the fan switch is turned on, it outputs a PTC heater operation request signal to the instrument cluster. The instrument cluster controls the PTC heater by operating PTC heater relay No.1/No.2 according to the ambient temperature and engine coolant signals.
• PTC heater operation is stopped if the following conditions are met:
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― The ignition switch is in the LOCK position, or the engine is not started
― The engine is cranking
― The engine is stalled
• The PCM temporarily stops PTC heater operation to prevent lowering of engine startability caused by high electrical current use during PTC heater operation.
• If the current/voltage information signal (present current, inputable current, and battery voltage) which is input from the PCM is lower than the specified value, the instrument cluster restricts the PTC heater operation pattern.
