B1001–A/C SWITCH REQUEST INPUT CIRCUIT LOW (CCN)For a complete wiring diagram Refer to Section 8W.Theory of OperationThe A/C mode switch input changes when the switch is pushed down. An active DTC indicates that the switch is stuck in a pushed position. A stored DTC indicates that the switch was stuck in a pushed position for more than two minutes, but has since returned to its normal state.When Monitored:With the ignition on.Set Condition:If the A/C mode switch is stuck in a pushed position for more than two minutes. This DTC has a maturing time of two minutes and a de-maturing time of two seconds. If the DTC's status changes from active to stored it will stay in memory for 100 ignition cycles.Possible CausesOBJECT HOLDING SWITCH IN A PUSHED POSITIONA/C HEATER CONTROL
Diagnostic Test1. VERIFY B1001–A/C SWITCH REQUEST INPUT CIRCUIT LOW IS ACTIVETurn the ignition on.With the scan tool, erase DTCs.Turn the ignition off, wait 10 seconds, and turn the ignition on.With the scan tool, read DTCs.Does the scan tool display this DTC as active?YesGo To 2NoCheck for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).2. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITIONInspect the A/C Heater Control for an object holding the switch in a pushed position. If present, remove the object.Turn the ignition on.With the scan tool, erase HVAC DTCs.Turn the ignition off, wait 10 seconds, and then turn the ignition on.Wait two minutes, then with the scan tool, read HVAC DTCs.Does the scan tool display this DTC as active?YesReplace the A/C Heater Control in accordance with the service information.Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).NoPerform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).