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B1083–HVAC MUX CIRCUIT HIGH (CONTINUED) For the Manual Temperature Control (MTC) circuit diagram (Refer to 24 - HEATING & AIR CONDITIONING - SCHE- For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes (C221) A/C SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE (C221) A/C SWITCH SENSE CIRCUIT OPEN INSTRUMENT CLUSTER (CCN) A/C HEATER CONTROL Diagnostic Test 1. VERIFY DTC B1083–HVAC MUX CIRCUIT HIGH IS ACTIVE Turn the ignition on. With the scan tool, erase CCN DTCs. Turn the ignition off, wait 10 seconds, and turn the ignition on. With the scan tool, read CCN DTCs. Does the scan tool display active: B1083–HVAC MUX CIRCUIT HIGH? Yes >> Go To 2 No >> Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL 24 - 320 HVAC - ELECTRICAL DIAGNOSTICS WK |