1. Disconnect the negative battery cable..
2. Remove the sunvisor..
3. Verify that the continuity between the vanity mirror illumination terminals is as indicated in the table.

If not as indicated in the table, inspect the bulb. If there is no malfunction, replace the sunvisor.

Vanity Mirror Illumination Bulb Removal/Installation
Power Outer Mirror Switch InspectionOperation of Automatic Air
Conditioning
Press the AUTO switch. Selection
of the airflow mode, air intake
selector and amount of airflow will be
automatically controlled.
Use the temperature control dial to
select a desired temperature.
Press the DUAL switch or turn the
front passenger temperature control
dial to control ...
Air Intake Actuator Inspection [Full Auto Air Conditioner]
1. Connect battery positive voltage to air intake actuator terminal B (or C),
connect terminal C (or B) to ground, and then verify that the air intake actuator
operates as shown in the table.
If the operation condition is not normal, replace the air intake actuator.
...
Battery
WARNING
Wash hands after handling the battery and related accessories:
Battery posts, terminals and related accessories contain lead and lead
compounds,
chemicals known to the State of California to cause cancer and
reproductive harm.
Read the following
precautions ...