KM3 - Check For Power On A/C Demand Circuit

- Key "ON", engine "OFF".

- Wide Open Throttle A/C Cut-Off (WAC) relay disconnected.

- A/C demand switch to "A/C ON".

- Measure voltage between A/C demand input pin at WAC relay vehicle harness connector and chassis ground.

- Is voltage greater than 10.5 volts?

Yes -- Go to KM5. KM5 - Check WAC Circuit For Short to Ground

No -- Verify operation of A/C clutch cyclic pressure switch and A/C demand switch. Refer to Heating and Air Conditioning. If OK, service open circuit. Reconnect all components. Re-evaluate symptom.