Switch Test
- Ensure that all input switches are turned off. After code 55 is displayed for "end of message" in diagnostic mode, watch display while operating various switches. Digital display MUST change if switches are working properly.
- Check brake pedal switch by applying and releasing brake pedal. Check A/T gear selector switch by moving lever from Park to Reverse to Park. Check A/C switch by turning blower switch to "ON" and "OFF" positions (only valid when A/C dampened pressure switch is closed).