Savana Mirror Heater Fix: Real DIY Solutions

As someone with some hands-on experience with car electronics, I dealt with a very similar issue on my 2005 GMC Sierra diesel. The mirror heating problem is actually quite common, especially relevant for winter driving safety. In my case, the heater element was working fine, but the issue stemmed from a faulty cable connection between the mirror and the door wiring. The workshop found that moisture had caused corrosion in one of the plugs. They cleaned the connections, replaced the damaged wiring section, and properly sealed everything. The repair cost was 95 Euro and took about 2 hours. Before spending money at a shop, you might want to check a few things: Does the fuse for the mirror heating look intact? Can you hear any clicking sound when activating the heating? Is there visible damage to the mirror casing or wiring? To provide more specific guidance about your car mirror issue, could you share: Does the heating fail on both mirrors or just one? Are there any other electrical issues with the mirrors (adjustment, folding)? What error code is stored in the system? This would help determine if your issue matches what I experienced or if it might be something different.

Thanks for the detailed suggestions about checking the wiring. My last service was at 142000 KM and the issue started shortly after. The heating fails on both mirrors and the error code is B1354. The power adjustment still works fine on both sides, just the heating is completely dead. I checked the fuse panel and all fuses look good, and theres no clicking sound when I press the heating button. The mirror casings look intact with no visible damage to the wiring. Wondering if this points more toward a system-wide issue rather than just the heater elements themselves.

Having gone through this exact situation with my GMC Sierra, that error code B1354 actually points to a temperature control module issue rather than the mirror heating elements themselves. This matches with both mirrors failing simultaneously while retaining their adjustment functionality. After my initial diagnosis with the wiring, I discovered the root cause was the temperature control module not sending proper signals to the mirror heating system. The lack of clicking sound you mention is another indicator, its the same symptom I had. In my case, the repair involved: Replacing the temperature control module (280 Euro), Recalibrating the system (included in labor), Total repair time was about 3 hours While checking the mirror connections was a good start, the simultaneous failure of both sides strongly suggests a central electrical fault rather than individual mirror issues. The fact that your power adjustments still work reinforces this, the basic mirror electronics are fine, its just the heating control thats affected. If you want to verify before replacing parts, try testing the voltage at the mirror connectors when activating the heat function. If you get no reading there, its almost certainly the control module.

Thanks for that thorough explanation about the temperature control module. It definitely makes sense that both mirrors failing at once while keeping their adjustment function points to a central system issue. That 280 Euro repair cost is steep but still better than replacing both mirrors entirely. Since my symptoms match yours exactly, no clicking, dual failure, working adjustments, I will go ahead and have the control module checked first. The vehicle safety aspect is important since winter driving without proper mirror defrosting can be dangerous. I will test the voltage at the connectors as suggested before proceeding with any repairs. Taking it to the shop next week and will make sure to have them verify the module before replacing any parts. Any recommendations on testing points for the voltage check? Want to make sure I measure at the right spots to get an accurate reading before the shop visit.