Control Assembly: Testing and Inspection

1. Measure the resistance of temperature control lever, between terminals A1 and A10 at each lever position.
Lever Position Resistance (k Ohms)
Max. Cool Infinite
Middle 1.5 +/- 0.2
Max. Warm 0

If resistance is not as shown, replace heater control assembly.





2. Inspect Indicator Light Operation
a. Connect the positive (+) battery lead to terminal A2 and the negative (-) battery lead to terminal A16.
b. With the blower button pushed in, check that the indicator light is lit. (The indicator light will not go on when the blower is in the OFF position.)
c. With the RECIRC/FRESH control button pushed in, check that the (RECIRC) indicator light is lit.
d. Next, press the RECIRC/FRESH control button in again (FRESH) and check that the indicator light goes off.
e. Press each of the mode buttons in and check that their indicator lights go on.

If the operation is not as specified, replace the heater switch.





3. Check that the illumination lights come on when the positive (+) battery lead is connected to terminal A3, and the negative (-) battery lead connected to terminal A4.

If operation is not as specified, inspect the bulbs.









4. Inspect blower switch continuity, if continuity is not as specified in illustration, replace the heater controls.









5. Inspect the air vent mode switch continuity between terminals.

If continuity is not as specified, replace heater control.





6. Inspect Recirc/Fresh control switch operation.

a. With the positive (+) battery lead connected to terminal A2 and the negative (-) battery lead connected to terminal A16, check that the RECIRC indicator light comes on.
b. Remove the battery leads.





c. Check that there is continuity between terminals A15 and A16, and no continuity between terminals A14 and A16 with the control switch in the FRESH position.
d. Check that there is continuity between terminals A14 and A16, and no continuity between terminals A15 and A16 with the control switch in the RECIRC position.

If operation is not as specified, replace heater control.