Component Tests and General Diagnostics

1. Turn ignition off, then on, to reset the system.

2. Ensure engine is warm. (At least 49°C (120°F) coolant temperature.)

3. Set control assembly to AUTO: 32°C (AUTO/9O°F).

^ Wait 40 seconds, minimum.

^ Verify that the system goes to high blower and that warm air is being discharged from the floor.
^ Verify that the recirc door is in the OUTSIDE AIR position.

^ Verify that warm air is bleeding out of the defroster nozzle.

^ Enter Self Test.

^ Record all faults and error codes displayed.

^ Exit Self Test.

^ Diagnose the system according to Error Code Key if any error codes are displayed. If any error codes were displayed during the AUTO: 32°C (AUTO/9O°F) test turn vehicle ignition off, then on, to reset the system.

4. Set control assembly to AUTO: 15°C (AUTO/6O°F).

^ Verify that the system goes to low blower then back to high blower as the temperature setting changes.

^ Wait 40 seconds, minimum.

^ Verify that cool air is being discharged from the panel.

^ Verify that the recirc door is in RECIRC position.

^ Enter Self Test.

^ Record all faults and error codes displayed.

^ Exit Self Test.

^ Diagnose the system according to Error Code Key if any error codes are displayed.

5. Repeat Step 3.

System Wiring Diagram:

6. Refer to Fig. 19 and Pinpoint Tests H through P for diagnosis if any other faults still exist. Pinpoint Tests