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Test 25C - ATC Blend Door Circuit

WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, 1994 Chrysler New Yorker, 1994 Chrysler LHS, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Perform TEST 19A before proceeding with this test.
  1. Connect DRB. With DRB in voltmeter mode, probe Pink/Dark Blue wire at Black BCM connector, located above right kick panel. If meter does not indicate higher than 10 volts, go to next step. If meter indicates higher than 10 volts, repair short to voltage on Pink/Dark Blue wire. Perform VERIFICATION TEST.
  2. If meter does not indicate higher than 4 volts, go to next step. If meter indicates higher than 4 volts, go to step 6).
  3. Turn ignition off. Unplug BCM connectors, located above right kick panel. With DRB in ohmmeter mode, probe Black BCM connector cavity No. 6 (Pink/Dark Blue wire). If resistance is not less than 5 ohms, go to next step. If resistance is less than 5 ohms, repair short to ground on Pink/Dark Blue wire. Perform VERIFICATION TEST.
  4. Using external ohmmeter, measure resistance between Gray/Tan wire at Beige BCM connector and Pink/Dark Blue wire at Black BCM connector. If resistance is less than 2000 ohms, go to next step. If resistance is not less than 2000 ohms, replace BCM. Perform VERIFICATION TEST.
  5. Unplug blend door actuator, located to left on A/C-heater unit. Using external ohmmeter, measure resistance between Gray/Tan wire at Beige BCM connector and Pink/Dark Blue wire at Black BCM connector. If resistance is less than 2000 ohms, replace mode door actuator. If resistance is not less than 2000 ohms, replace blend door actuator. Perform VERIFICATION TEST.
  6. With DRB in voltmeter mode, backprobe Pink/Dark Blue wire at HVAC connector, located near top center of A/C-heater unit. If voltage is higher than 4 volts, go to next step. If voltage is not higher than 4 volts, repair Pink/Dark Blue wire between HVAC connector and BCM. Perform VERIFICATION TEST.
  7. With DRB in voltmeter mode, backprobe cavity No. 5 (Red/White wire) at Black BCM connector, located above right kick panel. If voltage is not higher than 10 volts, go to next step. If voltage is higher than 10 volts, repair short to voltage on Red/White wire. Perform VERIFICATION TEST.
  8. With DRB in voltmeter mode, backprobe cavity No. 5 (Red/White wire) at Black BCM connector, located above right kick panel. If voltage is not higher than 0.1 volt, go to next step. If voltage is higher than 0.1 volt, go to step 11).
  9. With DRB in voltmeter mode, backprobe Red/White wire at HVAC connector, located near top center of A/C-heater unit. If voltage is not higher than 0.1 volt, go to next step. If voltage is higher than 0.1 volt, repair open Red/White wire between HVAC connector and BCM. Perform VERIFICATION TEST.
  10. Turn ignition off. Unplug 10-pin HVAC connector. Unplug Black BCM connector. With DRB in ohmmeter mode, probe Red/White wire at Black BCM harness connector. If resistance is less than 5 ohms, repair short to ground on Red/White wire. If resistance is not less than 5 ohms, inspect blend door for free movement. If door is okay, replace blend door actuator. Perform VERIFICATION TEST.
  11. With DRB in ohmmeter mode, backprobe Gray/Tan wire at Beige BCM connector. If resistance is less than 100 ohms, go to next step. If resistance is not less than 100 ohms, replace BCM. Perform VERIFICATION TEST.
  12. With DRB in ohmmeter mode, backprobe Gray/Tan wire at HVAC connector. If resistance is less than 100 ohms, go to next step. If resistance is not less than 100 ohms, repair open Gray/Tan wire between HVAC connector and BCM. Perform VERIFICATION TEST.
  13. With DRB in voltmeter mode, backprobe Dark Blue/White wire at Black BCM connector. Continue to observe voltmeter. Turn recirculation switch off. Turn panel switch on. Turn recirculation switch on. If voltage did not increase to higher than 10 volts, go to next step. If voltage increased to higher than 10 volts, go to step 16).
  14. Turn ignition off. Unplug BCM. Unplug 10-pin HVAC connector. With DRB in ohmmeter mode, probe Dark Blue/White wire at Black BCM connector. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, replace BCM. Perform VERIFICATION TEST.
  15. Read BCM INFORMATION. If BODY COMPUTER VERSION 1993 appears, repair short to ground in Dark Blue/White wire and replace BCM. Perform VERIFICATION TEST. If BODY COMPUTER VERSION 1993 does not appear, repair short to ground in Dark Blue/White wire. Perform VERIFICATION TEST.
  16. Read BCM codes. If ATC BLEND DOOR OUTPUT SHORTED TO BATTERY (OR) GROUND does not appear, go to next step. If specified code appears, perform TEST 25H.
  17. Using external voltmeter, backprobe Dark Blue/Red wire at HVAC connector. If voltage does not remain higher than 10 volts, go to next step. If voltage remains higher than 10 volts, repair short to voltage on Dark Blue/Red wire and replace BCM. Perform VERIFICATION TEST.
  18. Continue to observe external voltmeter. Rotate temperature control knob through its range from cold to hot. If voltage does not go higher than 10 volts, go to next step. If voltage goes higher than 10 volts, go to step 21).
  19. Using external voltmeter, backprobe Dark Blue/Red wire at Black BCM connector. Rotate temperature control knob through its range from cold to hot. If voltage does not go higher than 10 volts, go to next step. If voltage goes higher than 10 volts, repair open Dark Blue/Red wire between BCM and HVAC connector. Perform VERIFICATION TEST.
  20. Turn ignition off. Unplug BCM. Unplug 10-pin HVAC connector. With DRB in ohmmeter mode, probe Dark Blue/Red wire at Black BCM connector. If resistance is less than 5 ohms, repair short to ground on Dark Blue/Red wire and replace BCM. Perform VERIFICATION TEST. If resistance is not less than 5 ohms, replace BCM. Perform VERIFICATION TEST.
  21. Turn ignition off. Unplug BCM. Turn ignition on. With DRB in voltmeter mode, probe Dark Blue/White wire at Black BCM connector. If voltage is not higher than 10 volts, go to next step. If voltage is higher than 10 volts, go to step 23).
  22. Turn ignition off. Unplug 10-pin HVAC connector. Using external ohmmeter, measure resistance between Dark Blue/White wires at Black BCM connector and 10-pin HVAC connector. If resistance is less than 5 ohms, inspect blend door for free movement. If door is okay, replace blend door actuator. If resistance is not less than 5 ohms, repair open Dark Blue/White wire between BCM and HVAC connectors. Perform VERIFICATION TEST.
  23. Read BCM INFORMATION. If display is BODY COMPUTER VERSION 1993, repair short to voltage in Dark Blue/White wire and replace BCM. Perform VERIFICATION TEST. If display is anything else, repair short to voltage on Dark Blue/White wire. Perform VERIFICATION TEST.
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