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(b) Does the blower motor operate at its highest speed ? (c) Feel the outlet temperature. Does it get hot and then cycle cold ? (d) Does the air flow switch from DEFROST out- lets and then cycle to PANEL outlets? proceed to step 4, otherwise proceed to step 5. (4) If you answered NO to: SYMPTOM A The display symbols and indicators do not illumi- nate. Diagnostic Trouble Codes are not displayed. TEST After self-diagnostic test is complete, select a mode that will display the malfunction. ACTION If the ATC system operates properly, and the dis- play does not, replace ATC control panel computer. SYMPTOM B The blower motor does not operate. CAUTION: Stay clear of blower motor and power TEST Check all power module and blower motor connec- tions. Use a voltmeter to test for 12 volts (ignition) Turn ignition to the ON position. volts to body ground on the black/tan wire of the Check for 12 volts at the Power Module pin #4 (BK/TN). Check for continuity from the Power Module pin #3 (BK) to chassis ground. Replace the Power Module. ACTION If 12 volts is not detected, repair feed circuit. Refer to the Front Wheel Drive Car-Wiring Diagrams Ser- If 12 volts is not detected, repair wires of the blower motor or replace the blower motor. If 12 volts is not present, repair wire from the blower motor connector to the Power Module. If circuit is open, repair ground circuit of the Power Module. Replace the Power Module (power transistor open). SYMPTOM C The outlet air temperature does not become hot and then cycle to cold during self-test operation. Di- TEST/ACTION Make sure the blend-air door is properly attached to the actuator. If cold air is not discharged from the outlets, check the base A/C refrigerant system. Make sure heating operation works correctly, (wa- ter level, thermostat, heater hoses, heater core, etc.). SYMPTOM D Air does not flow from DEFROST outlets and then cycle to PANEL outlets during self-test operation. TEST/ACTION Check linkages from the mode door actuator for binding. Check for proper door travel in the unit. • Will return to the control settings that were se- Repair all Diagnostic Trouble Codes in the order that they have been indicated, and then retest the Diagnostic Test can be stopped at any time by de- pressing any button other than PANEL. DIAGNOSTIC TROUBLE CODE DEFINITIONS Non-computer aided diagnostics should be per- formed first. Hood of vehicle should be closed during Also refer to the wiring Pin out charts. • DIAGNOSTIC TROUBLE CODE 1 Involves the wiring or the ATC control head. • DIAGNOSTIC TROUBLE CODES 2, 13, 14, 15, Ä HEATING AND AIR CONDITIONING 24 - 73 |