For a complete wiring diagram Refer to Section 8W.When Monitored:With ignition on, and the rear Defroster Grid activated.Set Condition:When the Instrument Cluster (CCN) detects a low condition on the Rear Window Defogger Switch Signal circuit..Possible Causes(C215) REAR WINDOW DEFOGGER SWITCH SIGNAL CIRCUIT SHORTED TO GROUNDINSTRUMENT CLUSTER (CCN)HVAC CONTROL MODULE1. VERIFY REAR DEFROST SWITCH REQUEST INPUT CIRCUIT LOW IS ACTIVETurn the ignition on.With the scan tool, check for DTCs.Does the scan tool display this DTC as active?YesGo To2NoThe condition that caused this symptom is currently not present. Check 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. CHECK FOR DTC WITH THE A/C HEATER CONTROL DISCONNECTED

Turn the ignition off.Disconnect the A/C Heater Control C1 harness connector.Turn the ignition on.Using the scan tool, check for DTC'sDoes the scan tool display this DTC as active?YesGo To 3NoReplace A/C Heater Control in accordance with the service information.Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).3. CHECK THE (C215) REAR WINDOW DEFOGGER SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND

Disconnect the Instrument Cluster (CCN) C3 harness connector.Using an ohm meter measure the resistance from the (C215) Rear Window Defogger Switch Signal circuit to ground.Does the ohm meter read open circuit?YesReplace the Instrument Cluster (CCN) in accordance with the service information.Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).NoRepair short to ground on the (C215) Rear Window Defogger Switch Signal circuit.Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).