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Often times the headlights, brights and turn signals are on different fuses. I used to have a 98 and I was surprised at how many things were connected to each other in the fuse box. If you can not find a fuse related to the brights, then get a fuse tester and walk through all the fuse. If not, it is not a total loss, any car audio place installs alarms can trouble shoot it, if they want the money, rewire or fix it. They are usually cheaper then an autoshop.
I am guessing that when they plug the tester in they are getting nothing. If this is the case you may want to check the fuses for the connector. That fuse is located in the fuse panel inside the vehicle (picture below of location). Also below is a diagram of the layout of the fuses. I know it sounds odd but the fuse for the diagnostic connector is the fuse marked "horn" in that fuse panel. I hope this helps and good luck.
First check your fuses and bulbs. If they check out OK, there is probably a faulty relay. If the car starts and runs normally, the alarm module is probably OK. A broken wire is possible, but not likely, unless an aftermarket radio or alarm has been installed. One other possibility is a faulty or stuck door jamb switch. If there is a burnt fuse, you will need to find the short that caused it to burn out. Look for corrosion in all of the non-working light bulb sockets.
IF FUSE IS GOOD TEST LIGHT WILL LIGHT UP ON BOTH SIDES.IF IT LIGHTS UP ON ONE SIDE.IT BLOWN.REPLACE IT.ALSO CHECK TO MAKE SURE BLOWER MOTOR GROUND WIRE NOT BROKEN OR LOOSE.CHECK TO SEE IF POWER GOING TO SWITCH.IF YES.ITS THE SWITCH IT SELF.IF FUSE IS GOOD AND RELAY.
I had a similar problem on my S80 1999 2.9 . It turned out to be the SMS multifunction module in the steering column that had gone bad. I eventually had to have it replaced plus a software reload. It was expensive. Suggestions that did not work were to disconnect the battery, charge the battery, reload software . It was only after the unit was changed that the software was loaded at a cost
Check the fuses in the fuse box. Use the diagram on the back of the cover. also check to see if there is power to them by using a light bulb tester. That should determine if you have a short or a cut wire somewhere.