Component Tests and General Diagnostics

1. A/C control panel assembly:
INSPECT DRIVERS SEAT HEATER SWITCH OPERATION
a. Connect the positive (+) lead from the battery to terminal 17, 18 and negative (+) lead to terminal 40, 41.
b. Connect the positive (+) lead from the battery to terminal 28 through a 1.4 W test bulb.

c. Turn the defogger switch ON and check that the test bulb and indicator light turn ON, then turn OFF after about 15 minutes.
If operation is not as specified, proceed to the next inspection.

2. A/C control panel assembly:
INSPECT PASSENGER SEAT HEATER SWITCH OPERATION
a. Connect the positive (+) lead from the battery to terminal 17,18 and negative (-) lead to terminal 40, 42.
b. Connect the positive (+) lead from the battery to terminal 29 through a 1.4 W test bulb.

3. INSPECT SEAT CUSHION CONTINUITY
a. Heat the 2 thermostats with a light and check that there is no continuity above 40 °C (113 °F) between terminal 1 and 2.
b. Cool the 2 thermostats below 20 °C (59 °F) between terminals 1 and 2.
c. Check that there is continuity between terminals 1 and 3. If continuity is not as specified, replace the seat heater.

4. INSPECT SEAT BACK CONTINUITY
Check that there is continuity between terminals 1 and 2.
If continuity is not as specified, replace the seat back pad.

5. INSPECT IGNITION MAIN RELAY CONTINUITY
If continuity is not as specified, replace the relay.