Component Tests and General Diagnostics

Procedure

Note: Perform before beginning System Diagnosis

1. Check Rear WDO Defogger Grid for opens.
2. Check that G200 and G310 are clean and tight.
3. Check for an open HVAC Fuse #3.

^ Check for a broken (or partially broken) wire inside of the insulation which could cause system failure but prove "GOOD" in a continuity/voltage check. Use Test Light J 34142 whenever possible. Test lights require more current than a high impedance DVM and are more useful for detecting abnormally high resistive circuits. Some test lights have high impedances and will not be as useful in detecting resistive circuits.
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems.