GL Class (X166) 2013-2015 after facelift became GLS (X166)

GL350 Bluetec Auxiliary battery malfunction

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Old Oct 18, 2022 | 11:09 PM
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GL350 Bluetec
GL350 Bluetec Auxiliary battery malfunction

The auxiliary battery malfunction warning came on. Checked for the location of the auxiliary battery, right rear compartment, under seat location, and no battery. The GL350 does not have a lot of electronics. Could the battery have yet a different location. I have a feeling it would be a much smaller battery. Anyone experience this anomaly? Thanks.
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Old Oct 19, 2022 | 05:56 AM
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14 GL 350, 23Chevy Bolt EV and 22 EUV
I replaced mine last year without problems, right rear area. I believe I followed a YouTube video to assist.
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Old Oct 19, 2022 | 08:45 AM
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E55, GLS450, GL63, GLE350
What year is your GL350?
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Old Oct 19, 2022 | 01:14 PM
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GL350 Bluetec
Originally Posted by BlownV8
What year is your GL350?
2015, And there is no circuitry at either known location for the battery. One is in the battery compartment, other is right rear compartment. In the battery box under the seat there is some interesting circuitry where the battery would be located. Very strange.
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Old Oct 19, 2022 | 01:16 PM
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GL350 Bluetec
Thanks for the reply. See my reply to BlownV8.
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Old Oct 19, 2022 | 09:42 PM
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Should be in the right rear. You can access via the spare tire wheel well.
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Old Oct 20, 2022 | 11:37 AM
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GL350 Bluetec
Checked there too. No battery, no wire harness, Nothing. Do you think it could be in the right side of the dash?
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