GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

Heat not working on both front seat base

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Old Jan 24, 2026 | 10:49 PM
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Gl450
Heat not working on both front seat base

2007 . The base of the front seats won’t heat .. only the backs. Is there a separate fuse or relay for the base ?
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Old Feb 5, 2026 | 03:32 PM
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Any suggestions where to look?
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Old Feb 6, 2026 | 02:45 AM
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08 GL320 CDI
Backs work so you at least know there is power. So I'd assume its just a broken wire, so simple as something not plugged in. Maybe somebody pushed something under the seat and just unplugged the connection??

I had an old Audi that the sensor for the weight of the passenger was broken so the seat wouldn't turn on (just a broken wire, simple fix). If everything looks fine under the seat, you are going to have to pull it apart to investigate further.
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Old Feb 6, 2026 | 11:35 AM
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Both seats losing heat at base seems unlikely to be wire disconnect unless they are fed by same connector. I will check and find out. Thanks
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Old Feb 6, 2026 | 02:02 PM
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Oh, both? Ya, thats not just a wire issue.
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