Component Tests and General Diagnostics

1. Check the R DEFOG Fuse for an open. If the Fuse is blown check CKT 1040 for a short to ground.
2. Check the DIC/HVAC Fuse for an open. If the Fuse is blown check CKT 541 for a short to ground.
3. Make sure that G200 and G401 are clean and tight.
4. Check Rear Defogger Grid for opens.
^ 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.