Town & Country LWB FWD V6-3.3L VIN G Flex Fuel (1999)
DIAGNOSTICS
During the Actuator calibration, diagnostics are performed on the actuators and evaporator temperature Fin Sensor. Once diagnostics are completed
the REAR WIPER and INTERMITTENT LED's will flash to indicate either a successful calibration or the appropriate fail code(s). At this time
manual testing of the Blend, Mode and Driver (if equipped) potentiometers can be performed. If a failure is detected during Diagnostics a fault will be
set in the control. When Ignition is cycled OFF and then ON or Diagnostics is aborted, the REAR WIPER and INTERMITTENT LED's will flash
simultaneously showing that a failure has occurred. The control will not indicate the fail code, but only that a failure had occurred during the last
diagnostics test. The only way to clear the failure codes is repeat the Calibration Diagnostic and Cooldown test, after all repairs are completed.
COOLDOWN TEST
This test has been designed for performance testing of the A/C system at the manufacturing facility. If the IWAC control module is replaced, the
Cooldown test will occur during Calibration test. Cooldown will not occur on Heater Only units. During the Cooldown test the control will monitor the
temperature of the Fin Sensor. The A/C system must be able to bring the evaporator temperature down a predetermined minimum amount in less than
2 minutes.
CALIBRATION / COOLDOWN LED DISPLAY CODES
Calibration / Cooldown LED Display Codes
See chart for definition of the flashing LED's noted before ignition cycled off. If no problems are found, the control functions normally.
NOTE: Calibration is run automatically whenever the control head detects a "new" VIN number. Calibration may be initiated manually by pressing
and holding WASH and REAR WIPER buttons for 5 seconds.
COOLDOWN TEST ENTRY
To Initiate Test:
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Set Blower motor ON HIGH
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Open all A/C outlets
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Depress A/C and WASH buttons simultaneously for 5 seconds (until all LED's light)
Results:
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All LED's will turn on for 5 seconds
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Cooldown test is running if A/C and RECIRC are alternately flashing
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Acceptable result is when LED flashing stops
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Calibration Diagnostics and Cooldown must be run separately
CALIBRATION DIAGNOSTICS AND COOLDOWN ABORT
Test can be aborted by doing one of the following:
