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Symptom: *REAR WINDOW DEFOGGER GRID INOPERATIVE POSSIBLE CAUSES REAR DEFOGGER RELAY DTC’S INTERMITTENT CONDITION REAR WINDOW DEFOGGER GROUND CKT REAR WINDOW DEFOGGER GRID OPEN REAR WINDOW DEFOGGER RELAY OUTPUT OPEN REAR WINDOW DEFOGGER RELAY REAR WINDOW DEFOGGER RELAY OUTPUT SHORTED TO GROUND REPLACE FAULTY FUSE FUSED B(+) CKT OPEN AT RELAY SUBSTITUTE RELAY JUNCTION BLOCK REAR WINDOW DEFOGGER SWITCH SENSE CKT OPEN REAR WINDOW DEFOGGER SWITCH SENSE CKT SHORTED TO GROUND REAR WINDOW DEFOGGER SWITCH SENSE CKT SHORTED TO VOLTAGE AUTOMATIC ZONE CONTROL MODULE BODY CONTROL MODULE TEST ACTION APPLICABILITY 1 With the DRBIII t, read the Body Computer DTC’s. Are there any Rear Defogger Relay DTC’s present? All Yes → Refer to the symptom list for problems related to Rear Defogger No → 2 Toggle the Rear Defogger switch and observe the indicator. All Yes → No → 3 Turn the ignition and all lights off. All Yes → No → Repair the open Rear Window Defogger Ground circuit. 227 ELECTRICALLY HEATED SYSTEMS |