KM55 - Check ACD Circuit Continuity to Low Pressure Switch

- Key "OFF".

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

- Disconnect Low Pressure (LP) switch.

- Measure resistance between A/C demand switch side of LP switch vehicle harness connector and chassis ground.

- Is resistance less than 5.0 ohms?

Yes -- Go to KM56. KM56 - Measure Resistance of LP Switch

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