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Your right mirror stops blinking while the rest of the front end keeps flashing. The dash adds a lamp-out message for a lamp you can barely see.

This is a lens job, not a bulb change. The 2PCS mirror turn signal kit for the ML320, ML350, and GL450 (reference 1649061400) replaces the failed LED strip with a sealed unit.

Check the lens itself. Most of these trucks show one of three things:

• A milky haze inside the plastic.
• A strip of dead LED segments — the slim row of lights bonded inside the shell.
• An amber lens that has faded toward pink.

Why a sealed lens fills with water

A wet, foggy, or patchy lens is a replace-the-assembly job. There is no bulb behind the plastic, and no polish brings the sealing back.

The indicator is an LED strip: a slim row of lights glued inside a plastic shell. That seam opens by a hair over years of heat, washing, and pressure rinsing.

• Warm air carries moisture in; every cool-down condenses it onto the plastic.
• Water sits on the strip's copper traces and corrodes them.
• Segments die one at a time — dim, then patchy, then dark.

Sunlight is the second killer. The amber plastic fades to pink, and a faded lens throws a weak flash.

The warning that outlives the new lamp

The dash message can survive a correct new lens.

Your body computer (the module that switches your lights) watches current on the lamp circuit. A broken hinge wire or a corroded pin reads the same as a dead LED.

Run the angle test to separate the two failures:

• Fold and tilt the mirror while the blinker runs.
• The lamp flickers or drops out at certain angles → the wiring, not the LED.
• The lamp is dark at every angle → the sealed assembly itself.

Work in that order. Every light in this family lives in the lighting parts collection.

Verify before you order: number, side, connector

Two minutes with the old lens prevents the most common return. Run four checks:

1. Read the suffix molded on the old housing: 13 00 or 14 00. Catalogs disagree on sides, so your lens is the authority.
2. Hold the old lens against the listing photo: match the cut and the connector orientation.
3. The cut is handed — a left lens will not sit flush on the right.
4. If the shell came out full of water, clean green corrosion off the pins first.

Swapping the lens in fifteen minutes

No lift, no scanner. All published W164 walk-throughs follow the same moves:

1. Fold the mirror electrically, then push the glass to its outer travel.
2. Lever the glass out from the inner edge with a plastic trim tool — it is clipped, not bolted.
3. Release the heated-glass connector by hand.
4. Remove the lens fastener set or clips, then unplug the wedge connector.
5. Snap the new lens in and seat the connector until it clicks.
6. Clip the glass back onto its pins, then run the blinker check.

Two cautions come straight from owner experience:

• Keep the tool plastic — the glass edge and the housing clips break under a screwdriver.
• Seating a new lens disturbs a marginal hinge wire, so end the job with a wiggle test on the connector.

One side or both?

Nothing forces a pair. Each side has its own connector and its own LED strip, so replacing only the failed side is normal practice.

The 2PCS route still earns its price in three situations:

• Both lenses faded to the same pink — one new lens leaves a two-tone mirror.
• The surviving side already shows haze from the same moisture history.
• Both sides get done in one glass-out session anyway; only the second lens costs extra.

That is the case the 2PCS 1649061400 kit is built for. A single failed side is served by the right-side W164 / X164 unit above.

The same lamp, other Mercedes platforms

The diagnosis transfers across the Mercedes range: moisture kills the strip, hinge wiring fakes the failure, and the suffix on the old lens picks the part.

The W204 shows the same pattern with a different housing. The 2048200821 front-right indicator covers the 2008-2014 C250, C300, and C350, and the W204 / W212 pair adds sequential LEDs for CANbus compliance.

Van, G-Wagen, and older E-Class owners follow the same logic:

• Sprinter mirror indicator listing — the A91090646/47 pair, 2018 onward.
• Mirror signal lamp pair for the W211 / W463 family — W211, S211, W463, W461.
• Heated mirror glass guide for the W169 and W245 (2008-2012) — the same glass-out route, one part deeper.
• W164 / X164 / R-Class 722.9 transmission mount guide — the companion job list for the same SUVs.

Frequently asked questions