GLS Class (X166) Produced from 2016 to 2019

Turn Signal Error Message

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Old Jan 7, 2025 | 12:59 PM
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Kbach's Avatar
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From: Smyrna, GA
GLS550
Turn Signal Error Message

I replaced a damaged left rear turn signal with an aftermarket one off eBay. The fit and finish was great, but it gives a check left rear turn signal warning and fast flash. The auto shop I had check to see if they could adjust the computer said they would need to replace the turn signal with an OEM unit. When I asked about installing a load resistor, they said they do not do modifications like that.

My question is, has anyone else had this issue and will a 50w 6 ohm resistor resolve the problem. I think I'd just need to identify the correct wires on the plug to install.

Any thoughts...
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Old Jan 7, 2025 | 04:11 PM
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From: New Hampsha
'17 GLS450, '14 GLK250, Grandpa's Roadster
What kind of bulb was in the original? What's in the replacement? Does the vendor you got it from have a suggestion?
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Old Jan 7, 2025 | 06:54 PM
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From: Smyrna, GA
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Originally Posted by John CC
What kind of bulb was in the original? What's in the replacement? Does the vendor you got it from have a suggestion?
The tail lights do not actually have individual bulbs. It’s a complete unit with individual LEDs that gets changed out.

I contacted the vendor and they recommended taking it the a shop and adjust the computer. I got it off eBay and it’s more than likely Chinese.
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Old Jan 7, 2025 | 08:40 PM
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From: New Hampsha
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Well, the load resistor for sure won't work.
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Old Jan 24, 2025 | 07:26 PM
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From: Smyrna, GA
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I took the vehicle to a shop and they couldn’t do anything to clear the error code. Ended up getting a refund and buying a used OEM taillight.
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