Radio/A-C/display/fan failure — blown fuse

Tags: #fuse · #radio · #cooling-fan · #unresolved

Symptom. One owner's radio, A/C, the interior display, and the right-side cooling fans all stopped working at the same time — everything "to the right of the driver," in the owner's words ¹². The climate-control system was confirmed non-functional as part of the same failure, not a separate issue ³⁴.

Root cause found: a burnt 30A fuse under the hood. Investigation located a burnt 30A fuse in the engine-bay fuse box ⁵. The discoloration on the fuse's legs suggested more than a simple overload — "судя по цвету ножек... там не всё хорошо" (going by the color of the legs, something's not right there) ⁶. Community consensus: a fuse doesn't burn out "just because" — a genuine short circuit (КЗ) was suspected, most likely from a wire that had rubbed through its insulation somewhere and was touching the chassis/body ^{78 9}.

Debate: what amperage fuse to use for testing. Conflict, both sides attributed: HS Development argued for temporarily fitting a lower-rated 25A fuse instead of the correct 30A when testing, on the reasoning that a lower rating is gentler on the wiring if a short is still present and will blow before the wiring itself is damaged further ^1011121314. Che Guevara pushed back, arguing the 30A fuse was specified for a reason and that under-rating it risks a nuisance blow even without a real fault, so the correct fix is to find and repair the short and then use the proper 30A fuse rather than work around it with a smaller one ^15161718. Both agreed that if a fresh 30A fuse blows immediately upon installation, that by itself confirms a real short circuit is present rather than a one-off overload ¹⁹²⁰⁹.

Diagnostic process. Steps worked through in this thread: (1) test with a multimeter's continuity/diode-test setting to check circuits before and after the suspect fuse ²¹; (2) with the fuse pulled, turn the ignition on and hold the head-unit power button for a few seconds — power should not reach the unit if the fuse is truly the only feed, which helps confirm which circuit the fuse actually protects ²²; (3) pull back the corrugated wire-loom (гофра) in the suspect area and visually inspect the bundled wires for chafing, melted insulation, or scorch marks ^{23242526 2728}; (4) check connectors in the area for oxidation/corrosion after removing them ²⁶; (5) as a targeted test, apply water drop by drop onto the suspect harness section to try to reproduce an intermittent short under conditions closer to real-world moisture exposure, focusing on the area toward the main harness bundle ^29303132. In this case, visual inspection of the exposed wiring found insulation tape at the ends of a corrugated section that may simply be factory-applied strain relief rather than damage, so its presence there is not itself conclusive evidence of a prior fault ²⁸³³.

Outcome: unresolved in this batch, referred to a professional. After working through the above without pinning down the exact break/short location, the owner exhausted the troubleshooting options they were willing to try themselves and decided to pay for a professional diagnostic (quoted at 3,000 RUB, RU market, 2026-08) at an independent ("Euro auto") shop rather than an official dealer, deliberately leaving the dashboard disassembled in case the shop needs further access ³⁴³⁵. No fix was confirmed as of this batch of messages — logged here as an open case; revisit and merge in the professional shop's findings if/when the owner reports back.

Related report: dead functions after a battery change. In a similar case an owner changed the battery and checked all fuses, found a 15 A fuse in the cabin and replaced it; some functions returned, but the heater and climate control still did not work. Wiring under the dash was wrapped in tape and a member saw possibly melted wires near the BCM connectors; another member suggests wiggling the connectors under the seat and trying a fuse swap ^36373839. Fuse ratings of the blocks are in the fuse and relay map.

Media

The head unit/dashboard photographed off — a blank black touchscreen and dark AC control cluster, showing the display, radio, and climate controls all dead at once

A DT-832 digital multimeter with the diode/continuity-test position circled in red, marking the setting recommended for checking the suspect circuit

Close-up of the exposed wiring harness with the corrugated loom (гофра) pulled back, showing a bundle of blue, red, yellow, and white wires and a section of exposed/bare wire near a taped joint

A second angle of the same exposed wiring harness and corrugated-loom section shown in message 49817

Related pages

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• Fog/parking light fuse (5A) blowing
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• Trailer wiring adapter fuse damage
• Radio interference from rear defroster

Sources

This page is compiled from 39 community messages. Every fact carries a numbered reference to its original author and message.

Last updated: 2026-10-29