Both front seats heated, but now the driver's side switch on-indicator doesn't light and the warm is gone on that side The wiring diagram I'm guessin' for the '90 is going to be the same as for the '91 (?) http://justplainobvious.blogspot.com/2012/01/fix-heated-seats-in-volvo-240.html and the guy who publishes this says "If your heated-seat indicator bulb illuminates, it means the fuse and wiring up to that point is good." Does this mean conversely that if the left bulb doesn't illuminate but the right (passenger) side does then the problem is likely with the driver's-side switch itself?