KF57 - Check Additional Relay For Short To Ground
- Key "OFF".- Low Fan Control (LFC) and High Fan Control (HFC) relays disconnected.
- AC Pressure Switch (ACPSW) disconnected.
- Disconnect additional fan relay.
- Measure resistance between the circuit to the additional fan relay at the ACPSW vehicle harness connector and the battery negative post.
- Is resistance less than 10,000 ohms?
Yes -- Service short to ground. Reconnect all components. Re-evaluate symptom.
No -- Check if additional fan relay normally open contacts are always closed. Service as necessary. Reconnect all components. Re-evaluate symptom.