98 S90 Cruise control

ChrisG75077 · Post by **ChrisG75077** » 20 Jan 2011, 14:56

The Cruise does not work. The markings on the stalk are gone, but I followed the manual and it will not set. Any ideas?

Post by **jimmy57** » 20 Jan 2011, 16:52

The seat and the cruise may be related. There are two relays in the dash end fuse panel that switch on power to a couple of groups of fuses to take load off the ignition switch. They are labeled power supply A and B.
Turn on ignition and then tap those relays with the handle end of a screwdriver. Bad contacts or a bad solder joint in one of those may have killed the dead items. Smack relay and then try the RH seat, if it works go for drive and check the cruise.
If that repairs the relays are not expensive and available at several places and just pull out to replace.
Fuses that look good can be open and not conduct power.
There have been thousands of hours of experienced technician labor spent chasing problems for which a fuse "looked like it was good" but had a crack instead of the obvious burned open visible blown condition.
The cruise control has lots of things that can make it not work.
Faulty switch on column, brake cancel switch slipped out of position, servo on throttle under hood has ruptured, the hose from pump to servo or pump to brake pedal cancel switch is split, the pump is faulty, and the cruise module is faulty or is loose from electrical panel it mounts on.