To troubleshoot a climate fault:
- Check to see if the system is displaying an accurate temperature. If the temperature is dashed out, a thermistor may have come loose.
- To rule out the BMPRO system, locate the Node and disconnect the A/C climate connector. This is the XA-4 connector.
- Next, cycle power and check if the fault remains with the XA-4 connector disconnected.
- If the fault remains with A/C disconnected, there is an issue with the Node. If the fault is cleared when the A/C is disconnected, the Node is not at fault. You will need to check the wiring and troubleshoot the A/C control module.