Product Overview

This is an aftermarket compatible rubber power button for the Garmin zūmo 340LM, 345LM, 350LM, 390LM, and 395LM motorcycle GPS navigators, which share the same housing and button design. It is intended for riders whose original power button has cracked, hardened, or fallen off — a common issue on this generation of zūmo devices, since the button also seals the internal switch against water. Installation requires cutting away the old rubber layer and bonding the new button in place with adhesive; it is not a simple press-fit part.

Compatibility

Compatible:

• Garmin zūmo 340LM
• Garmin zūmo 345LM
• Garmin zūmo 350LM
• Garmin zūmo 390LM
• Garmin zūmo 395LM

These five models share the same front housing design and power button, based on consistent listings from multiple aftermarket parts suppliers.

Not confirmed:

• Garmin zūmo 396 LMT-S (a later model — uses a similarly-functioning rubber power button, but not confirmed to be the same size/shape as this part)
• Garmin zūmo 590LM / 595LM (larger devices with a comparable rubber-button design, but not confirmed interchangeable)
• BMW Navigator Street (some third-party listings group this model with the zūmo 340–395 series for this button, but this has not been independently confirmed)

Confirm your exact model before ordering. If your model isn't listed above, do not assume the button will fit, even if the general design looks similar.

Common Replacement Scenarios

This part is typically needed when:

• The rubber power button has cracked, hardened, or broken off
• The original button has visibly deteriorated or fallen apart from age
• The device is no longer sealing properly at the power button, raising water-resistance concerns
• The button feels loose or fails to register presses reliably despite the internal switch still working

Key Features

• Aftermarket compatible rubber power button — not a genuine Garmin part
• Designed to match the button size and mounting position across the zūmo 340LM/345LM/350LM/390LM/395LM shared housing
• Intended to restore a proper physical and weatherproof seal over the internal power switch
• Standalone button only — does not include the surrounding rubber front panel or internal switch

Specifications

Installation Notes

The front of the device housing is built from a plastic base with a rubber layer bonded on top, and the power button is part of that rubber layer. Installation is not a simple snap-in replacement:

1. Remove the battery and clean the case, keeping it dry throughout the process.
2. Use a knife to carefully cut through the old rubber layer around the button.
3. Peel away the old rubber layer from the plastic button base using a plastic tool, taking care not to damage the base underneath.
4. Clean the exposed surface with isopropyl or ethyl alcohol.
5. Apply a suitable adhesive (a cyanoacrylate-based adhesive with a compatible primer is commonly used for this type of rubber-to-plastic bond) evenly across the prepared surface.
6. Press the new button firmly into place and allow the adhesive to cure fully — typically 24 hours — before use.

Because this repair involves cutting near the device housing and bonding a part responsible for water sealing, take care during removal not to damage the underlying plastic base, and ensure the adhesive fully cures before exposing the device to moisture.

What Is Included

• 1x replacement rubber power button (aftermarket compatible)
  

Buying Checklist

• Confirm your device is one of: zūmo 340LM, 345LM, 350LM, 390LM, or 395LM
• Understand that installation requires cutting off the old button and bonding the new one with adhesive — this is not a press-fit repair
• Check that the internal mechanical switch beneath the button still functions — a new button will not fix a failed internal switch
• Source a suitable adhesive and primer separately if not included with your order
• Allow full adhesive cure time before using the device outdoors or in wet conditions

FAQ

Q: My power button has crumbled or fallen apart — is this a known issue on these models?
A: Yes. Riders on Zumo-dedicated forums have reported this exact issue — for example, one owner asked where to find a replacement after their 340LM's rubber power button "fell to bits" from age.
Source: Zumo User Forums — Garmin Zumo 345/350

Q: Is this a simple snap-in replacement?
A: No. Multiple aftermarket suppliers describe the same installation process: cutting through the old rubber layer, peeling it off the plastic base, cleaning the surface, applying adhesive, and pressing the new button into place before letting it cure for about 24 hours.
Source: gFixer — Rubber Power Button for Garmin Zumo 350; Amazon — Ciuouient Replacement Rubber Power Button

Q: Will replacing the button fix a device that won't turn on at all?
A: Not necessarily. If the internal mechanical switch beneath the button has failed — rather than just the rubber cover — a new button alone won't restore power-on function. Confirm the internal switch still responds (e.g., by pressing firmly into the recess where the button sits) before ordering.

Q: Will this restore my device's water resistance?
A: A properly bonded and fully cured button is intended to restore the physical seal over the switch. However, since the bond depends on careful installation, water resistance after a DIY repair cannot be guaranteed to the same standard as the original factory seal.

Q: What should I check before ordering?
A: Confirm your exact model is one of the five listed (340LM, 345LM, 350LM, 390LM, 395LM), plan for an adhesive-based installation rather than a press-fit, and source a compatible adhesive separately if one isn't included.

Package Include

• Repair parts are shown in the picture.

Product Inspection

• Display Screen Check
• Cable Connection Check
• Frame Waterproof Test
• Contact Oxidation Inspection