Stratus Sedan L4-2.4L VIN X (2003)
System Availability
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A Manual Temperature Control (MTC) HVAC system is available in all JR series vehicles.
System Controls
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.
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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.
System Revisions
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The 2003 JR Manual Temperature Control (MTC) HVAC system remains carryover from 2002.
System Diagnostics
Fault detection is through stored Diagnostic Trouble Codes (DTCs)
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DTCs are displayed by the DRBIII(R)
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All MTC DTCs are stored in the BCM. Diagnostics for these DTCs can be found in the Heating & A/C category.
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DTCs pertaining to A/C compressor control circuits and the radiator fan control circuits are stored in the PCM Diagnostics for these DTCs can be
found in the Powertrain Diagnostic Procedures. Diagnostics for symptoms pertaining to A/C compressor operation can also be found in the
Powertrain Diagnostic Procedures.
Following A Repair
Calibrate HVAC Door Actuators
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The electric door actuators (blend, mode, recirculation) must be calibrated after making any repairs to the HVAC system. To calibrate the door
actuators, either disconnect the battery or remove JB Fuse #5 for five minutes.
Interior Lighting System
INTERIOR LIGHTING
Courtesy Lamp Control
The body controller has direct control over the majority of the vehicle's courtesy lamps. The body computer will illuminate the courtesy lamps under
any of the following conditions:
1. Any door is ajar.
2. The courtesy lamp switch on the instrument panel is closed.
3. A Remote Keyless entry unlock message is received. If the interior lamps are left on after the ignition is turned off, the BCM will turn them off
after 15 minutes or until either the dome lamp switch or door ajar switch changes state.
Illuminated Entry
Illuminated entry will be initiated when the customer enters the vehicle by unlocking the doors with the key fob, or with the key if the vehicle is
equipped with vehicle theft alarm. Upon exiting the vehicle, if the lock button is pressed with a door open, illuminated entry will cancel when the door
closes. If the doors are closed and the ignition switch is turned on, the illuminated entry also cancels.
Mechanical Instrument Cluster
MECHANICAL INSTRUMENT CLUSTER
The Mechanical Instrument Cluster (MIC) is divided into 4 sections. Primary gauges (Speedometer and Tachometer), secondary gauges (Fuel Level,
Engine Coolant Temperature), PCI bus enabled indicator lamps and hardwired enabled indicator lamps.
The gauge mechanisms function in the same way. The main differences are in the face and size of the gauge.
The Oil Pressure, Brake Warning, Turn Signal and Fog Lamp indicators are directly wired to the circuits that they are indicators for. These indicators
are located in, but not controlled by, the MIC and are not part of any MIC self test or diagnostic. All indicators are replaceable bulbs or LEDs.
The PCM sends a gauge position message to the BCM through the PCI bus. The MIC receives this message from the BCM, translates it, and positions
