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NOTE: The Cooldown Test can take up to 90 seconds to run. While the test is running, the A/C status indi- Allow the test to run to completion before proceeding. Actuate the Display DTC function by performing the following: • Turn the blower control on. • Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately NOTE: The A/C Heater Control will display a DTC for every fault that it detects, not just DTCs specific to A/C NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and Does the A/C status indicator display any DTCs? Yes >> Diagnose and Repair the DTC(s). Refer to the Table of Contents in this Section for a complete list of HVAC related symptoms. Run the Cooldown Test again after the repair is complete. No >> As necessary, either Go To 3 or 4, or Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND 3. GENERAL SYSTEM OPERATION & FUNCTION TEST If not done so previously, start the engine. Turn the blower control on. Turn the Blend control to full cold. Turn the Mode control to panel. Press the A/C mode switch on, wait 30 seconds, press it off, and then proceed to the next step. Press the EBL mode switch on, wait 30 seconds, press it off, and then proceed to the next step. Turn the Blend control to full hot, wait 30 seconds, turn it to full cold, and then proceed to the next step. Turn the Mode control to every door position. Leave it in each position for 30 seconds. When complete, proceed to Actuate the Display DTC function by performing the following: • Turn the blower control on. • Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and NOTE: If multiple DTCs are active, diagnose those that relate to a short circuit first. Does the A/C status indicator display any DTCs? Yes >> Diagnose and repair the DTC(s). Go To 4 if Overcurrent faults (DTC 41, 43, or 44) are present and run the Actuator Circuit Test / Door Calibration Function. Otherwise, refer to the Table of Contents in this No >> If you are here due to a stored DTC, it is possible that a technician may not have erased the DTC following a repair. If possible, verify if the vehicle was recently in for this type of service. Otherwise, Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL 24 - 318 HVAC - ELECTRICAL DIAGNOSTICS LX |