Q&A

I changed a faulty heater control module (the controls under the radio), and when I plug that in, my gauges quit working. They work fine if I leave the wiring unplugged on the heater controls.I left the controls on heat and defrost and I do have the fan control plugged in for defrosting and heat for cold mornings. But doing so, I do not have control over temperature or control for rear window functions now (defrost, wipers, etc). Could problem be in wiring itself or with the cluster, or perhaps the used heater control module I put in. The self diagnostic on the heater control module ends up with no fault codes, but with the heater control wiring plugged in, I cant even get the self dianostic on the cluster to activate until I unplug it from the back of the heater control.