- Check for continuity between the No. 2 terminal of the heater fan switch 7P connector and body ground.
HEATER FAN SWITCH 7P CONNECTOR
Wire side of female terminals
Is there continuity?
YES - Go to step 31.
NO - Check for an open in the wire between the heater fan switch and body ground. If the wire is OK, check for poor ground at G501. 
- Test the A/C switch.
Is the A/C switch OK?
YES - Replace the heater fan switch.
NO - Replace the push switch.
- Check for proper A/C system pressure.
Is the pressure within specifications?
YES - Replace the A/C pressure switch.
NO - Repair the A/C pressure problem.
