Town & Country V6-3.3L VIN R (2003)
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two front, two-wire electronic blend door actuators.
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one front, two-wire electronic mode door actuator.
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one, two-wire electronic recirculation door actuator.
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one rear, two-wire electronic blend door actuator.
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one rear, two-wire electronic mode door actuator.
System Relays
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The Integrated Power Module (IPM) houses and provides power to the A/C Clutch Relay, Front Blower Motor Relay, and Rear Blower Motor
Relay.
SYSTEM REVISIONS
Revisions to the 2003 ATC system include:
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all new version 13 (Two-Zone) and OF (Three- Zone) system software.
CAUTION: Automatic Temperature Control (ATC) Modules with software versions 41 and 0A used in 2001 and 2002 RS/RG vehicles are NOT
compatible with software versions 13 and OF used in 2003 RS/RG vehicles. Do NOT install an ATC Module with software version 41 or 0A in a
2003 RS/RG vehicle or an ATC Module with software version 13 or 0F in a 2001 or 2002 RS/RG vehicle. Use the DRBIII(R) to verify which
version software the ATC Module is using by selecting Body Systems, Automatic Temperature Control, and then selecting Module Display.
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a Two-Zone HVAC system on select models.
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a Cabin Heater used in conjunction with the ATC system. For additional information on this system, refer to The AC Cooldown Test, under
System Diagnostics in this General Information section, and refer to Cabin Heater under General Information and Diagnostic Procedures.
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deletion of the rear IR sensor.
SYSTEM DIAGNOSTICS
Fault detection is through active and stored Diagnostic Trouble Codes (DTCs)
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DTCs are displayed by the DRBIII(R).
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Active DTCs are those which currently exist in the system. The condition causing the fault must be repaired in order to clear this type of DTC.
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Stored DTCs are those which occurred in the system since the ATC Module received the last "clear diagnostic info" message.
The AC Cooldown Test:
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is actuated with the DRBIII(R).
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checks A/C system performance based on evaporator temperature sensor input.
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forces the ATC to initiate the Cabin Heater Activation request when the vehicle is equipped with a Diesel Cabin Heater Assist.
WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH AS A GARAGE THAT DOES NOT HAVE
EXHAUST VENTILATION FACILITIES. ALWAYS VENT THE DCHA's EXHAUST WHEN OPERATING THE DCHA. REFER TO
VENTING THE DCHA's EXHAUST UNDER CABIN HEATER IN THE GENERAL INFORMATION PORTION OF THIS SECTION
FOR PROPER EXHAUST VENTING INSTRUCTIONS. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
PERSONAL INJURY OR DEATH.
CAUTION: Do not activate the A/C Cooldown Test with the engine off. Failure to follow these instructions may result in internal damage to the
DCHA Heater Module.
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The FCM monitors the PCI bus for the Cabin Heater Activation request. The request carries the status bit that the FCM requires to activate its'
Cabin Heater Assist Control output. This output is a low side driver (coming from FCM pin 15) which supplies a ground signal to the Cabin
Heater (pin 5). When the Cabin Heater receives this ground signal input, it interprets this as an activation signal.
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The FCM low side driver is also capable of diagnostic sensing. The driver will sense an open circuit when the driver is off, and will sense a
short to voltage when the driver is on. The FCM will set DTCs for both of these types of faults. For additional information, refer to Cabin
Heater under General Information and Diagnostic Procedures in the manual.
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Will not run the air conditioning portion of this test if ambient temperature is below 12°C (53°F).
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The forced Cabin Heater activation will occur even if the air conditioning portion of this test fails to initiate because AC Cooldown test criteria
was not met. When activated, the DCHA will operate for approximately seven minutes. Three minutes to run and four minutes to purge.
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will pass the air conditioning portion of this test if the evaporator temperature drops 6.7°C (20°F) within two minutes of starting this test.
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messages (air conditioning related only) display on the DRBIII(R) after running this test.
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These messages will clear after paging back out of this test. Therefore, it is important to note all of the AC Cooldown test messages before
doing so.
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All Cabin Heater-related DTCs display under Cabin Heater, Read DTCs.
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will cause the DELAY and Snowflake VF segments on the ATC to flash for 162 seconds (RG with DCHA only). If the air conditioning
portion of this test fails, the DELAY and Snowflake VF segments will continue to flash until the vehicle is driven more than three miles.
Manual Temperature Control (MTC)
MANUAL TEMPERATURE CONTROL (MTC)
CAUTION: Manual Temperature Control (MTC) Modules with software versions 0614 and 0700 used in 2001 and 2002 RS/RG vehicles are NOT
