Troubleshooting Hints - Compressor Controls

1. CHECK A/C Compressor Clutch operations in Heating, Ventilation, and Air Conditioning.
2. CHECK that HTR-A/C Fuse 12, IGN E MINIFUSE, and A/C COMP FUSE are not open. If any Fuse is open, LOCATE and REPAIR source of overload and REPLACE the Fuse(s).
3. CHECK that Grounds G104 , G105 and G200 (Diesel) or Grounds G103, G104, G105 and G200 (Gasoline) are clean and tight.
4. CHECK that A/C Compressor Clutch Relay is properly mated to its connector.
5. CHECK condition of Diode D104. REPLACE if either opened or shorted.
6. If the A/C Compressor Clutch is operating continuously, CHECK for short to ground on DK GRN/WHT (459) wire. If shorted to ground, LOCATE and REPAIR source of short.
- CHECK for broken (or partially broken) wire inside of 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