99 GMC Jimmy 4x4. Electric seat adj's have quit?

[Eriedipper]

The controls on both of the front power seats have suddenly quit?

I've been through the driver's manual looking for a fuse or circuit breaker for the power seats & can't see one listed!
(They do list a fuse for the heated seats??)

I can hardly believe this?

Strange thing though..... the "lumbar adj" on both seats still works.

Has anyone any suggestions please?

Thanks..... Lofty