How are HVAC Electronic Control Module issues diagnosed?
When the heater or air conditioner, and sometimes other components that happen to be tied into the control module, act erratically or not at all, the technician will go for the diagnostic scan tool. This will allow the technician to view current system operation as long as the control module is still functioning. If during the course of diagnostics any circuit is reading differently in the control module than is input, or the control module is sending incorrect information, it will be considered faulty. This is because all control modules are designed to send information, receive information, and interpret that information based on pre-set information.
How are HVAC Electronic Control Modules replaced?
Like any other control module, the location of the HVAC electronic control module will be identified, and the technician will then begin removing all obstructing components needed to access and remove the control module. Once accessed and removed, the connectors are cleaned and inspected, and the new module will be installed. After all components are reassembled on the vehicle, the technician will program the control module, if needed, and test the operation of the system to ensure the customer complaint has been corrected.
RepairPal Recommendations for HVAC Electronic Control Module issues
When dealing with electronic systems, especially if the issue pertains to the control module, we recommend thorough diagnostics before replacing parts. In effort to correct an electronic failure, it would be very easy to spend hundreds of dollars replacing components before realizing the issue is more advanced. In the case of electronic failures, diagnostics is a must.
What to look out for when dealing with HVAC Electronic Control Module issues
Every possible scenario related to the failure of the HVAC electronic control module can be replicated by one or more failures within the HVAC control system. This means that the control module may be blamed for an external issue, or an external component may be blamed for an internal HVAC electronic control module issue. When the issue has been routed to one circuit, the entire circuit should be tested to prove the diagnosis.
Can I replace the HVAC Electronic Control Module myself?
Except for the very advanced DIY mechanic with a strong understanding of computerized circuit diagnostics and testing, this repair should be left to a professional. Again, diagnostics of electronic systems are difficult for the untrained person to perform correctly. Unless safety and diagnostic methods are understood and followed properly, this should be left to a professional.
