X39 - Verify Cooling Fan Ground

- Key "OFF".

- Cooling fan disconnected.

- Constant Control Relay Module (CCRM) disconnected.

- Jumper Pin 1 to Pin 3 at the CCRM vehicle harness connector.

- Connect negative probe of Digital Volt/Ohm Meter (DVOM) to the battery negative post.

- Check for voltage to the cooling fan vehicle harness connector (check Power-To-High Fan pin).

- Is voltage greater than 8.0 volts?

Yes -- Service open in ground circuit to fan. Reconnect all components. Re-evaluate symptom.

No -- All others: Service open in power-to-fan circuit from CCRM vehicle harness connector to cooling fan vehicle harness connector. Reconnect all components. Re-evaluate symptom.