Component Tests and General Diagnostics

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. Check INDIC Fuse, CLSTR Fuse, and REAR DEFOG Circuit Breaker.
2. If REAR DEFOG Circuit Breaker is open, check CKT 1040 for a short to ground.
3. Check that G203 and G302 are clean and tight.
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (refer to General Troubleshooting Procedures). Diagnostic Aids
^ Refer to System Diagnosis. System Diagnosis - Rear Window Defogger & Heated Mirrors (SSE & SSEI Models)