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HVAC System Test

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn the ignition on. With the DRBIII®, attempt to communicate with the Powertrain/Engine Control Module. With the DRBIII®, attempt to communicate with the Body Control Module. With the DRBIII®, attempt to communicate with the Front Control Module. If the DRBIII® was able to communicate with the PCM/ECM, the BCM, and the FCM, go to the next step. If the DRBIII® was not able to communicate with the PCM/ECM, the BCM, and the FCM, refer to the communication section of the DIAGNOSTIC TROUBLE CODE IDENTIFICATION table for the related symptom(s). See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table.
  2. With the DRBIII®, read Powertrain/Engine Computer DTC's. If there are any HVAC related DTCs present, see SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If there are not any HVAC related DTCs present, go to the next step.
  3. With the DRBIII®, read Body Computer DTC's. If there are any DTCs present, see DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table. If there are not any DTCs present, go to the next step.
  4. With the DRBIII®, read Front Control Module DTC's. If there are any DTCs present, see DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table. If there are not any DTCs present, go to the next step.
    5. CAUTION: The work area ambient temperature must be above 60°F (15.6°C) to test A/C system operation.
    NOTE: Active codes must be resolved before diagnosing stored codes.
    NOTE: Anytime a code becomes active, or a Cooldown Test fault message is displayed, proceed to the conclusion question.
    NOTE: If multiple codes appear, diagnose those that relate to a short circuit first.
  5. Start the engine. Press the ATC Power switch on. Turn the mode control to the panel position. Verify that the front and rear blower motors operate correctly in all speeds from each control. Diagnose and repair all blower related faults before proceeding with this test. Turn the front blower control to the high speed position. Before actuating the AC Cooldown Test, verify that the A/C compressor is not running. If the compressor is running, turn the A/C off and allow the evaporator to warm up before proceeding with the test. With the DRBIII® in ATC, System Tests, perform the AC Cooldown test. Turn the front blower control to the low speed position. Turn the rear blower control to the Rear Control position. Set the Driver, Rear, and Pass temperature controls to 60. Monitor the DRBIII® for active ATC DTCs while performing the following test steps. Press the recirculation mode switch on, wait 30 seconds, and then press it off. Press the A/C mode switch on, wait 30 seconds, and then press it off. Press the rear defogger switch on, wait 30 seconds, and then press it off. Set the Driver temperature control to the Max heat setting, wait 30 seconds, and then set it to the Max cool setting. Repeat this step for the Rear and Pass temperature controls. Turn the mode control to each position for 30 seconds and then turn it back to the panel position. Press the Auto HI switch, wait 30 seconds, and then press the Auto LO switch. When function is complete, turn the front blower control to the low speed position. On the Rear ATC Control, set the rear temperature control to the Max heat setting, wait 30 seconds, and then set it to the Max cool setting. On the Rear ATC Control, turn the mode control to each position for 30 seconds. With the DRBIII® in ATC, Miscellaneous, reset the ATC. If the DRBIII® displays any active ATC DTCs or Cooldown Test fault messages, return to the DIAGNOSTIC TROUBLE CODE IDENTIFICATION table and choose the symptom(s) See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table. If the DRBIII® does not display any active ATC DTCs or Cooldown Test fault messages, go to the next step.
  6. With the DRBIII®, read PCM/ECM DTC's. If there are any HVAC related DTCs present, see SELF-DIAGNOSTICS article in ENGINE PERFORMANCE for the related symptom(s). If there are not any HVAC related DTCs present, recheck the climate control system performance. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in HVAC.
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