Dead Blower in Suzuki Ignis, AUC Sensor Investigation

Running a 1998 Suzuki Swift 1.6L here and encountered similar symptoms last winter. The complete blower failure you describe is likely not related to the AUC sensor or auto recirculation system, those typically affect air quality control but not basic fan operation. Based on my repair experience, this points to either: 1. Failed blower motor 2. Blown fuse 3. Faulty blower motor resistor 4. Damaged wiring harness The most common culprit is the blower motor resistor. When mine failed, the blower would not respond to any speed settings through the climate control panel, exactly like your situation. Check the fuse first, its the simplest fix. If thats good, the resistor pack likely needs replacement. Not a major repair but requires removing the lower dash panel to access. The air conditioning sensor and HVAC sensor systems are separate from the basic blower operation, so I would focus troubleshooting on the blower circuit components first.

Thanks for the detailed reply. My problem was exactly as you described, no response from the blower regardless of settings. I checked the fuse but it was fine, so I went ahead and replaced the blower motor resistor. The fan works perfectly now across all speeds. Could you share what the repair cost in your case? Also wondering if you encountered any other HVAC sensor issues since fixing the resistor pack? Want to know if I should watch out for anything else with these Suzuki blower systems.

Good to hear you got it fixed. For my Swift, the blower motor resistor repair actually revealed a damaged AUC sensor cable connection which explained some previous climate control quirks. The mechanic fixed both the BMW AUC sensor wiring and the resistor pack, total was 95€ for the cable repair work. Since fixing the air quality sensor and connections, the HVAC system has worked flawlessly. No more auto recirculation issues or climate control glitches. The key was having a thorough diagnostic check of the entire system rather than just replacing parts. These Suzuki blowers are generally reliable once properly repaired. Just keep the cabin air filter clean and check the climate control operations regularly. The HVAC sensor system should work smoothly if all connections are secure. A properly functioning AUC sensor really improves the auto climate performance. Worth having it checked during regular maintenance to catch any developing issues early.

Thanks everyone for your help! Just wanted to update on how it went. Took it to my regular mechanic who diagnosed the blower motor resistor right away. Parts and labor came to 120€ total, more reasonable than expected. The whole repair only took about an hour. The mechanic also found and fixed a loose connection in the HVAC sensor wiring while he was in there. He explained this likely wouldnt have affected the blower, but could have caused problems with the auto recirculation system down the road. Been running great for the past week, all fan speeds working perfectly and the cabin air sensor seems to be doing its job controlling the fresh air intake. Really glad I asked here first before assuming it needed major work. Will definitely keep an eye on the blower system during future services.