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Front IR Sensor Not Calibrated

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn ignition switch to OFF position. Locate ATC remote sensor located above ATC module. Disconnect ATC remote sensor 4-pin harness connector. See Fig 1. Turn ignition switch to ON position. Using DVOM, measure voltage at ATC remote sensor connector terminal No. 1 (Light Blue/Pink wire). If reading is more than 10 volts, go to next step. If reading is 10 volts or less, go to step  14.
  2. Measure voltage at ATC remote sensor 4-pin harness connector terminal No. 4 (Brown/Light Blue wire). If reading is more than 10 volts, go to next step. See Fig 1. If reading is 10 volts or less, go to step  12.
  3. Turn ignition switch to OFF position. Disconnect ATC module C3 connector. See Figure. Turn ignition switch to ON position. Measure voltage at ATC remote sensor 4-pin harness connector terminal No. 4 (Brown/Light Blue wire). See Fig 1. If reading is one volt or more, repair short to voltage in Brown/Light Blue wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING. If reading is less than one volt, go to next step.
  4. Turn ignition switch to OFF position. Connect ATC control C3 connector. Set up lab scope (oscilloscope) for 12-volt square wave pattern. Set lab scope voltage range to 20 volts with an offset of 4 volts. Set lab scope to 40-millisecond division (40ms/div) scale. Connect lab scope ground lead to chassis ground. Connect lab scope probe lead to ATC remote sensor harness connector terminal No. 2 (White/Light Blue wire). See Fig 1. Turn ignition switch to ON position. If lab scope pattern is good and cycles between 0 and 8 volts, go to next step. If voltage pattern is erratic or does not cycle between about 0 and 8 volts, go to step  9.
  5. Turn ignition switch to OFF position. Using DVOM, measure resistance between ground and sensor return circuit at ATC remote sensor harness connector terminal No. 3 (Brown/Light Blue wire). See Fig 1. If reading is less than 10 ohms, go to next step. If resistance is 10 ohms or more, go to step  7.
  6. Replace ATC remote sensor. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in HVAC.
  7. Turn ignition switch to OFF position. Disconnect ATC module C3 connector. Measure resistance in Brown/Light Blue wire between ATC module C3 connector terminal No. 3 and ATC remote sensor harness connector terminal No. 3. See Fig 1 and Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown/Light Blue wire.
  8. Replace ATC module. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING.
  9. Turn ignition switch to OFF position. Disconnect ATC module C3 connector. Turn ignition switch to ON position. Using DVOM, measure voltage between ground and ATC remote sensor connector terminal No. 2 (White/Light Blue wire). See Fig 1. If reading is more than one volt, repair short to voltage in White/Light Blue wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING. If reading is less than one volt, go to next step.
  10. Turn ignition switch to OFF position. Measure resistance between ground and ATC remote sensor connector terminal No. 2 (White/Light Blue wire). If reading is less than 100 k/ohms, repair short to ground in White/Light Blue wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING. If reading is 100 k/ohms or more, go to next step.
  11. Measure resistance in White/Light Blue wire between ATC module C3 connector terminal No. 2 and ATC remote sensor connector terminal No. 2. See Figure and Fig 1 . If reading is 5 ohms or more, repair open in White/Light Blue wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING. If reading is less than 5 ohms, go to step  8.
  12. Turn ignition switch to OFF position. Measure resistance between ground and ATC remote sensor connector terminal No. 4 (Brown/Light Blue wire). If resistance is 100 k/ohms or more, repair short to ground in Brown/Light Blue wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING. If reading is less than 100 k/ohms, go to next step.
  13. Disconnect ATC module C3 connector. See Figure. Measure resistance in Brown/Light Blue wire between ATC module connector C3 terminal No. 4 and ATC remote sensor connector terminal No. 4. If resistance is less than 5 ohms, go to step  8. If resistance is 5 ohms or more, repair open Brown/Light Blue wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING.
  14. Measure resistance in Light Blue/Pink wire between ATC module connector C3 terminal No. 1 and ATC remote sensor connector terminal No. 1. See Fig 1 and Figure . If resistance is less than 5 ohms, go to step  8. If resistance is 5 ohms or more, repair open Light Blue/Pink wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING.
Fig 1: Identifying ATC Remote Sensor Connector Terminals
G00172183Courtesy of DAIMLERCHRYSLER CORP.
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