X17 - Check HFC Circuit Continuity

- Key "OFF".

- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- Install breakout box, leave PCM disconnected.

- Constant Control Relay Module (CCRM) disconnected.

- Measure resistance between the High Fan Control (HFC) test pin 31 at breakout box and Pin 17 of CCRM vehicle harness connector.

- Is resistance less than 5.0 ohms?

Yes -- Go to X18. X18 - Check HFC Circuit For Short to Power

No -- Service open in HFC circuit. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)