Control Assembly: Testing and Inspection

A/C CONTROL ASSEMBLY INSPECTION








1. INSPECT ILLUMINATION OPERATION
Connect the positive (+) lead from the battery to terminal A-13 and the negative (-) lead to terminal A-3, then check that the illuminations light up. If illuminations do not light up, test the bulb.

2. INSPECT INDICATOR LIGHT OPERATION
Air Inlet Control Switch:






a. Connect the positive (+) lead from the battery to terminal A-9 and the negative (-) lead to terminal A-8.
b. With the air inlet control button pushed in, check that the FRESH or RECIRC indicator light lights up.
c. Next, push in the button again, and check that the indicator light goes off and the other indicator light lights up.







d. Then connect the positive (+) lead from the battery to terminal A-13 and check that the indicator dims.

If operation is not as specified. replace the A/C control assembly.

Mode Control Switch:







a. Connect the positive (+) lead from the battery to terminal A-9 and the negative (-) lead to terminal B-16.
b. Push each of the mode buttons in and check that their indicator light lights up.







c. Then connect the positive (+) lead from the battery to terminal A-13 and check that the indicator dims.

If operation is not as specified, replace the A/C control assembly.

Blower Speed Control Switch:







a. Connect the positive (+) lead from the battery to terminal A-9 and the negative (-) lead to terminal B-16.
b. Push each of the blower speed control buttons in and check that their indicator light lights up.







c. Then connect the positive (+) lead from the battery to terminal A-13 and check that the indicator dims.

If operation is not as specified, replace the A/C control assembly.

A/C or DEF Switch:







a. Connect the positive (+) lead from the battery to terminal A-9 and the negative (-) lead to terminal B-18.
b. Push the A/C or DEF switch button in and check that the indicator light lights up.







c. Then, connect the positive (+) lead from the battery to terminal A-13 and check that the indicator dims.

If operation is not as specified, replace the A/C control assembly.










3. INSPECT AIR INLET CONTROL SWITCH CONTINUITY

If continuity is not as specified, replace the A/C control assembly.










4. INSPECT MODE CONTROL SWITCH CONTINUITY

If continuity is not as specified, replace the A/C control assembly.










5. INSPECT BLOWER SPEED CONTROL SWITCH CONTINUITY

If continuity is not as specified, replace the A/C control assembly.







6. INSPECT A/C OR DEF SWITCH CONTINUITY
Check that there is continuity between terminals B-6 and B-17 intermittently each time the A/C or DEF switch button pressed.

If continuity is not as specified. replace the A/C control assembly.







7. INSPECT TEMPERATURE CONTROL SWITCH RESISTANCE
a. Measure resistance between terminals B-1 and B-2.

Standard resistance:
Approx. 3.0 K Ohms

b. Check that the resistance between terminals B-1 and B-3 increases from 0 to approx. 3.0 K Ohms when the switch knob is turned from COOL to HOT.

If operation is not as specified, replace the A/C control assembly.