Troubleshooting Hints - Front Ventilation Controls
TROUBLESHOOTING HINTSGeneral
1. See Instrument Panel Dimming illumination lamp circuits for diagnosis.
2. If the Mode or Temperature Doors do not operate smoothly in response to control Dial changes, the rheostat in the Module may be bad or a ground connection from the Module may be open.
- CHECK for a broken (or partially broken) wire inside 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 system.
Front
1. CHECK condition of HTR-A/C FUSE. If Fuse is open, LOCATE and REPAIR cause of overload and REPLACE Fuse.
2. CHECK that Grounds G105 and G200 are clean and tight.