Side mirror assembly — folding motor failure

Tags: #mirror · #part-number · #price

Part number and pricing: left mirror part number 5CA16918X#E1, listed on kitparts.ru. A full replacement mirror is expensive — a new complete mirror costs around 20,000 RUB (RU market, May 2025) ¹².

Motorized folding failure — worn plastic gears: the power-fold mechanism fails when its internal plastic gears wear down and develop play/slop. Symptoms: a loud grinding/whirring noise ("вжик") followed by complete failure of the fold function. One owner's mirror worked normally all winter, then stopped folding once the weather warmed up — suggesting temperature/lubrication-related wear can surface seasonally rather than failing gradually and predictably. A repair kit for the gears is mentioned as existing, but a full mirror-assembly replacement is often more practical than attempting a gear-level repair ³⁴.

Disabling automatic mirror folding in winter: to stop mirrors from auto-folding in cold weather, two approaches are reported: Option A — cut the motor wire inside the connector (the same connector controls both heating and the fold motor, so identify the correct wire carefully); Option B — install an alarm system (e.g. StarLine A63), which prevents the automatic folding behavior as a side effect. If folding isn't disabled, a workaround is to apply silicone spray regularly to the folding mechanism and to activate the heated mirrors before arriving at the destination, to prevent ice buildup from locking the fold mechanism. One owner reports using a StarLine A63 alarm with no folding issues ^{567891011121314}.

Left mirror fails to fold only in cold weather: separate report — the left mirror fails to fold when locking the car with the factory alarm specifically in cold/fall weather, but works reliably in warm seasons, consistent with the thermal/lubrication wear pattern above. Likely thermal contraction affecting the motor mechanism; debris in the gears can also prevent folding in some cases, and manual disassembly + cleaning may restore function temporarily ^1516171819. Conflict: one owner reports the opposite seasonal pattern — folding works only in summer and stops once autumn begins ¹⁸, while another reports the reverse of that too ¹⁹ — the temperature relationship is not consistent across cars.

Trick to prevent mirrors from auto-folding when locking (no disassembly): stand at the center of the car, press the lock button on the driver door with one hand while simultaneously opening the rear door with the other hand, then close the rear door quickly to catch the moment before the lock completes — this consistently prevents the mirrors from folding on both left and right sides, without cutting any wires or disassembling anything. The trick was discovered by accident (a rear-door passenger closed the door right as the driver locked the car) and confirmed to work by repeating it several times ^2021222324. Conflict: one user reports this trick only works in winter, suggesting a possible temperature or mechanical sensitivity ²⁵.

Disabling automatic mirror folding on door lock: the door-interrupt method (Алексей: works; Konstantin: asks how to reverse it) and the battery-disconnect method with its re-enable steps are described in [Electric mirror adjustment — disable methods]](../body-exterior/electric-mirror-control-disable.md) ^26272829.

Mirror-element disassembly for internal repair (left mirror): to service the mirror internals: pry the mirror glass element gently with plastic tools (not metal) from the edges, working in a warm environment (~room temperature) to protect the fragile plastic. The core assembly is held by two hex-torx screws under the mirror element; plastic liftoff tools are needed to separate the plastic housing, and the assembly must be rotated carefully — protective clips hold it together and require delicate separation. After accessing the interior, disconnect the heating wires and the turn-signal-repeater bulb, then reassemble in reverse. This job benefits from a 2-person team and prior experience; cold temperatures make the plastic brittle, so use a heat source or a warm garage. Replacing just the repeater bulb element is the most common repair; a full mirror replacement is often cheaper than attempting an internal mechanism repair ^{30313233343536373839404142434445}. ⚠️ Note: the reporting author mentions photo evidence of this repair was later deleted, and recommends less-experienced DIYers use a professional service given the fragile plastic and complex clip system.

Turn-signal repeater bulb replacement — requires internal mirror- element removal: replacing the turn-signal repeater bulb inside the side mirror requires removing the mirror glass element from the inside — it cannot be accessed from outside only. The snap fasteners holding things together are delicate and risk breaking. Recommended to do the job in a warm garage with two people, or via professional help. Parts (including for older/20-year-old X80s) are readily available through auto-parts catalogs ^{464748495051525354}. Separately, the mirror's turn-signal repeater bulb itself can be replaced without excessive difficulty once the back panel is removed — again best done in a warm environment to avoid cracking brittle cold plastic; parts available from Chinese suppliers (Kitzip/Kitparts) and Russian retailers ⁵⁵⁵⁶⁵⁷.

Electric mirrors unresponsive in cold or on low battery: side mirrors may fold or freeze in position (fail to respond to the fold/ unfold control) when battery voltage is low or in extreme cold. Fixes: (1) manually assist the mirror fold/unfold gently, without forcing it; (2) spray WD-40 under the mirror-housing access hatch; (3) restore full battery charge. Mirrors typically recover normal function once the car warms up and battery power is restored ^{58596061626364656667686970}.

Auto-fold ratchet sometimes fails to fully latch: separately from the gear-wear failure above, owners report the power mirrors' automatic fold/unfold function sometimes doesn't latch fully — one or both mirrors fold or extend only partially, with the internal ratchet mechanism failing to catch completely. This affects convenience rather than safety. The auto-fold function itself cannot be easily disabled without removing interior panels and disconnecting the wiring harness (see [the disable methods card]](../body-exterior/electric-mirror-control-disable.md) for the battery-disconnect method) ⁷¹⁷²⁷³.

Turn-signal repeater removal — detailed step-by-step: repair procedure for a failed side-mirror turn-signal repeater (повторитель поворота), most often caused by corrosion: (1) remove the mirror completely from the door; (2) at home, in a warm environment, press the bottom of the mirror element to create a gap at the top, then grip and pull the mirror element toward you to release its retaining clips; (3) carefully pry off the painted protective cap; (4) unscrew the micro-bolts to access the repeater element; (5) replace the repeater bulb/LED. Alternative first step: check the power supply at the door-panel connector before disassembling, in case the fault is wiring rather than the bulb itself. The assembly is delicate — the mirror element can crack if forced ^747576777879.

Turn-signal repeater — sealed unit, part 5DA069182, and mirror-clip removal trick: separately, the mirror turn-signal repeater/side-marker light is confirmed to be a sealed, non-repairable unit — the entire repeater assembly (not just the bulb) must be replaced if it fails. Left-side part number: 5DA069182, priced from 2,745 RUB (RU market, March 2026) at autonomia.pro (the cheapest source found by one owner). Mirror removal tip: the mirror housing is held by clips — gently heat it first to soften the clips, then insert fingers into the gap that opens at the top of the mirror and pull outward ^{808182838485868788}.

Pre-facelift mirror part numbers — mirror element vs. full assembly: for pre-facelift (дорест) cars, the mirror element only part number is 5CA16912Z; the full mirror assembly with housing (left side) is 5CA56918X. When buying a used mirror on Avito, verify condition carefully before purchase — some listed units are fire-damaged (from heated-mirror wiring faults) ^89909192.

Mirror folding asymmetry is by design, not a defect: multiple owners report the mirrors don't fold symmetrically — the right mirror fully retracts while the left mirror doesn't fully close. Community analysis concludes this is not a defect: the mirrors are mounted at different initial angles, and when both fold through the same uniform rotation angle, the asymmetry naturally persists. This affects both pre-facelift and facelift models ^9394959697.

Driver's mirror element removal — screwdriver tab-release trick: to remove the driver's-side mirror element (glass/element only, not the whole housing): rotate the mirror element to the right (or left) to expose the mounting tab, then use a thin, long screwdriver to press on that tab and carefully pop the element free. This is a quick technique for addressing a loose or rattling mirror element without a full disassembly ⁹⁸⁹⁹.

Media

Mirror folding positions demonstrating the asymmetry — right mirror fully retracted

Left mirror at a partial fold angle, not fully closed

The sealed turn-signal repeater unit removed from the mirror housing

Related pages

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• Side-mirror heating — availability by trim

Sources

This page is compiled from 99 community messages. Every fact carries a numbered reference to its original author and message.

Last updated: 2026-10-29