With Manufacturer's Scantool

1. Connect tester C-4805 or equivalent to diagnostic connector located in engine compartment near passenger side strut tower. Access fault codes as outlined.
2. After Code 55 has been displayed, indicating end of fault code display, observe tester display and operate switches as follows:
a. Operate brake lamp switch by depressing and releasing brake pedal.
b. Operate neutral safety and indicator lamp switches by moving shift selector through range.
c. Ensure that A/C dampened pressure switch is closed, then cycle A/C compressor clutch on and off with blower switch in on position.
d. On 1986-87 models, raise and support vehicle and rotate drive wheels to operate speed sensor.
3. As each switch is opened and closed, numerical read-out on tester should change.
4. If read-out does not change as switch is operated, check continuity of wiring between switch and logic module and repair as needed.
5. If wiring is satisfactory, test each switch individually.