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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 32 (A/C-Heater System - Automatic) >> Trouble Shooting >> Test 25D - ATC Mode Door Circuit

Test 25D - ATC Mode 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 mode 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 blend door actuator. If resistance is not less than 2000 ohms, replace mode 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. 4 (Red wire) at Gray 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 wire. Perform VERIFICATION TEST.
  8. With DRB in voltmeter mode, backprobe cavity No. 5 (Red wire) at Gray 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 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 wire between HVAC connector and BCM. Perform VERIFICATION TEST.
  10. Turn ignition off. Unplug 10-pin HVAC connector. Unplug Gray BCM connector. With DRB in ohmmeter mode, probe Red wire at Gray BCM harness connector. If resistance is less than 5 ohms, repair short to ground on Red wire. If resistance is not less than 5 ohms, inspect mode door for free movement. If door is okay, replace mode door actuator.
  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 display is BODY COMPUTER VERSION 1993, repair short to ground in Dark Blue/White wire and replace BCM. Perform VERIFICATION TEST. If display is anything else, repair short to ground in Dark Blue/White wire. Perform VERIFICATION TEST.
  16. Read BCM codes. If ATC MODE DOOR OUTPUT SHORTED TO BATTERY (OR) GROUND does not appear, go to next step. If specified code appears, perform TEST 25J.
  17. Using external voltmeter, backprobe Dark Green/Yellow 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 Green/Yellow wire and replace BCM. Perform VERIFICATION TEST.
  18. Continue to observe external voltmeter. Press panel, defrost, and bi-level switches, one at a time. 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 Green/Yellow wire at Black BCM connector. Press panel, defrost, and bi-level switches, one at a time. If voltage does not go higher than 10 volts, go to next step. If voltage goes higher than 10 volts, repair open Dark Green/Yellow 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 Green/Yellow wire at Black BCM connector. If resistance is less than 5 ohms, repair short to ground on Dark Green/Yellow 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 Green/Yellow 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 Green/Yellow wires at Black BCM connector and 10-pin HVAC connector. If resistance is less than 5 ohms, inspect mode door for free movement. If door is okay, replace mode door actuator. If resistance is not less than 5 ohms, repair open Dark Green/Yellow wire between BCM and HVAC connectors. Perform VERIFICATION TEST.
  23. Read BCM INFORMATION. If BODY COMPUTER VERSION 1993 appears, repair short to voltage in Dark Blue/White wire and replace BCM. Perform VERIFICATION TEST. Perform VERIFICATION TEST. If BODY COMPUTER VERSION 1993 does not appear, repair short to voltage on Dark Blue/White wire. Perform VERIFICATION TEST.
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