Sebring Sedan V6-2.7L VIN R (2004)
HEADLAMP DELAY
The headlamp time delay operates when the ignition switch is turned off while the headlamps are still on, and the headlamps are then turned off within 45
seconds after the ignition is off. This will provide a 90-second time delay before turning off the headlamps.
Heating and A/C System
SYSTEM AVAILABILITY
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Depending on the model, either a Manual Temperature Control (MTC) or Automatic Temperature (ATC) HVAC system is available in these
vehicles.
SYSTEM CONTROLS
MANUAL TEMPERATURE CONTROL (MTC)
The Manual Temperature Control (MTC):
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controls blower motor operation, providing four blower speeds (Low, M1, M2, & High).
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interfaces with the BCM through hardwired circuits.
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provides temperature setting information to the BCM through a resistor.
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provides an A/C request, an EBL request, and mode switch setting information to the BCM through a resistive multiplexed circuit.
The Body Control Module (BCM):
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drives the EBL status indicator in the MTC. Refer to the Service Manual for additional information about rear window defogger operation.
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drives the electric door actuators (mode, blend, recirc).
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sends and A/C request, over the PCI Bus, to the PCM when A/C operation is desired.
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uses Evaporator Temperature Sensor data to prevent evaporator freeze up while maintaining optimum cooling performance.
The MTC HVAC system uses:
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one, five-wire electric blend door actuator.
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one, five-wire electric mode door actuator.
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one, two-wire electric recirculation door actuator.
AUTOMATIC TEMPERATURE CONTROL (ATC)
The Automatic Temperature Control (ATC):
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is addressable with the DRBIII(R)
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communicates over the Programmable Communication Interface Multiplex System (PCI) Bus.
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can be operated in a manual mode.
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uses an integral-mounted aspirator motor and in-car temperature sensor to maintain occupant comfort levels when set in an automatic mode.
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provides a request over the PCI Bus to the BCM when door actuator (blend, mode, recirculation) operation is desired.
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provides a request over the PCI Bus to the BCM when A/C operation is desired.
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provides a request over the PCI Bus to the BCM when EBL operation is desired.
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provides desired blower motor operating speed data over the PCI Bus to the BCM.
The Body Control Module (BCM):
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drives the ATC status indicators (EBL, A/C, and Recirc) over the PCI Bus.
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remembers the last temperature setting at power down.
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sets the initial temperature setting via the PCI Bus when the ATC is powered up.
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drives the electric door actuators (mode, blend, recirculation).
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controls blower motor operating speed.
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There are 14 blower speeds when the ATC is in manual mode and infinite speeds when the ATC is in automatic mode.
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monitors the blower motor for a stall condition via a blower speed sense circuit.
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sends a request over the PCI Bus to the PCM when A/C operation is desired.
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uses sun load sensor data to maintain occupant comfort levels when the ATC is set in an automatic mode.
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uses Evaporator Temperature Sensor data to prevent evaporator freeze up while maintaining optimum cooling performance.
Blower Motor Operation
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The Blower Power Module provides the blower motor with power and a path to ground. It also sends a blower control signal to the BCM. The
BCM constantly receives desired blower speed data from the ATC over the PCI Bus. Using this data, the BCM processes the blower control signal
which sets the speed that the Blower Power Module will run the blower motor.
The ATC HVAC system uses:
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one, five-wire electric blend door actuator
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one, five-wire electric mode door actuator
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one, two-wire electric recirculation door actuator.
SYSTEM REVISIONS (ATC & MTC)
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The 2004 JR Manual Temperature Control (MTC) HVAC system remains carryover from 2003.
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The Automatic Temperature Control (ATC) HVAC system is new for 2004 JR. The ATC system is similar to that used in LH vehicles.
SYSTEM DIAGNOSTICS (ATC & MTC)
