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*A/C HEATER CONTROL WILL NOT ENTER DIAGNOSTIC MODE (MTC) (CONTINUED) For a complete wiring diagram Refer to Section 8W. Theory of Operation An active DTC 33 will prevent the control from entering diagnostic mode and performing certain diagnostic functions, Possible Causes OBJECT HOLDING A/C MODE SWITCH / EBL MODE SWITCH IN A PUSHED POSITION SUBSTANCE CAUSING A/C MODE SWITCH / EBL MODE SWITCH TO GET STUCK IN A PUSHED POSITION (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO VOLTAGE (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO (C121) SENSOR GROUND CIRCUIT (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO GROUND (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT OPEN A/C STATUS INDICATOR / EBL STATUS INDICATOR INOPERATIVE A/C HEATER CONTROL Diagnostic Test 1. INSPECT THE A/C HEATER CONTROL FOR DAMAGE Turn the ignition off. Inspect the A/C Heater Control for damage. Is the A/C Heater Control damaged? Yes >> Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL No >> Go To 2 2. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE A/C MODE SWITCH OR EBL MODE SWITCH TO Inspect the A/C Heater Control for anything that would cause the A/C mode switch or the EBL mode switch to stay Is anything present that would cause the A/C mode switch or EBL mode switch to stay or stick in a Yes >> Repair as necessary. Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL No >> Go To 3 24 - 356 HVAC - ELECTRICAL DIAGNOSTICS WK |