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B100A–RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW (ATC) For a complete wiring diagram Refer to Section 8W. Theory of Operation The switch input changes when the switch is pushed down. A stored DTC B100A indicates that the Recirculation • When Monitored: • Set Condition: Possible Causes OBJECT HOLDING RECIRCULATION MODE SWITCH IN A PUSHED POSITION SUBSTANCE CAUSING RECIRCULATION MODE SWITCH TO GET STUCK IN A PUSHED POSITION A/C HEATER CONTROL Diagnostic Test 1. INSPECT THE A/C HEATER CONTROL FOR DAMAGE 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 RECIRCULATION MODE SWITCH TO STAY OR Inspect the A/C Heater Control for anything that would cause the Recirculation mode switch to stay or stick in a Is anything present that would cause the Recirculation mode switch to stay or stick in a pushed posi- Yes >> Repair as necessary. Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL No >> Go To 3 3. CHECK FOR NORMAL RECIRCULATION MODE SWITCH & STATUS INDICATOR FUNCTION Turn the ignition on. Set the Mode control to any position between Panel and Floor. Press the Recirculation mode switch on and off several times while observing the Recirculation status indicator. Does the Recirculation status indicator turn on and off? Yes >> Go To 4 No >> Replace the A/C Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL 24 - 218 HVAC - ELECTRICAL DIAGNOSTICS LX |