Chrysler Town and Country 2003 Owner's Manual page 577

REAR BLEND POT CIRCUIT OPEN (ACTIVE) - MTC —
TEST
6 Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
NOTE: Make sure that the Rear Blower Rear Control Switch C2 harness
connector is connected to the Rear Blower Rear Control Switch.
Measure the resistance of the Rear Blower Rear Control Switch, Rear Blend
Potentiometer as follows:
Turn the Rear Blend knob to full hot.
Measure the resistance between the 5 Volt Supply circuit and the Rear Temperature
Feedback Signal circuit at the A/C - Heater Control Module C1 harness connector.
The resistance should be approximately 800 ohms.
Slowly rotate the Rear Blend knob from full hot to full cold while viewing the DVOM.
The reading should change fluidly from approximately 800 to 10.5K ohms.
Turn the Rear Blend knob to full hot.
Measure the resistance between the 5 Volt Supply circuit and the Rear Temperature
Return circuit at the A/C - Heater Control Module C1 harness connector. The
resistance should be approximately 10.9K ohms.
Slowly rotate the Rear Blend knob from full hot to full cold while viewing the DVOM.
The reading should stay steady at approximately 10.9K ohms.
Turn the Rear Blend knob to full hot.
Measure the resistance between the Rear Temperature Return circuit and the Rear
Temperature Feedback Signal circuit at the A/C - Heater Control Module C1 harness
connector. The resistance should be approximately 10.2K ohms.
Slowly rotate the Rear Blend knob from full hot to full cold while viewing the DVOM.
The reading should change fluidly from approximately 10.2K to 800 ohms.
Are all of the resistance measurements as specified?
Yes → Replace the A/C - Heater Control Module in accordance with the
→ Replace the Rear Blower Rear Control Switch in accordance with
No
ACTION
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
553
HEATING & A/C
Continued
APPLICABILITY
All