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I have a 2003 9-5 Linear that had the cruise control first be intermittent to work or not and then finally quite all together. I knew that the main components were the brake and cruise switch at the brake peddle, the cruise and turn signal switch on the steering and the dreaded electronic throttle body. I started by throwing parts at the problem with replacing both switches at the brake peddle. Nothing changed. Then I removed the switch on the steering column and took it to the kitchen table and tested the end contact engagement switch and it tested good with a continuity tester. I disassembled the switch, cleaned the contacts and reassembled it and reinstalled it and again nothing (at least this time I did not buy the $95 switch, so far wasted $32 on the other 2 peddle switches)
Now welcome to the Saab wiring twilight zone. (kinda like doing brain surgery via your foot)
I had my independent Saab Master Tech that has my beloved 1998 NG900 ask me when I told him what happened to the 9-5 if I had any burned out bulbs in the rear tail lights and I told him no but thought what did that have to do with anything so I started with all the bulb testing. All of the bulbs in the lights that did not lift with the trunk were OK. Then I went after the rear fog lights and reverse lights in the trunk lid. Guess what, neither would light up. My trusty assistant and wife also noticed that the car had no rear trunk indicator on the dash and when you cut on the rear fog lights the SID said fog light failure (we never run these). The only functioning electric item in the trunk lid was the actuator for the trunk release. I decided to luckily try to introduce a ground direct to the rear fog light wiring at the light and guess what it lit up. Both of them. I traced the wiring harness from the trunk lid to the inside of the trunk under the liner on the driver’s side and unplugged the harness. I did a continuity check on the black wire and nothing from the light to the plug in inside the trunk. I started undoing the rubber gourmet the wiring harness is in from the fixed part of the car to the moving trunk lid whitch is 4 pieces. Started at the rear quarter it is rubber accordion style then a plastic tube mounted to the trunk hinge and then rubber and then a plastic gourmet on the trunk lid. When I disconnected the accordion rubber from the gourmet on the trunk lid and, low and behold two wires were severed in two. The black one and the green one. I then proceeded in pulling new wires through the rubber and plastic maze from the quarter panel to the trunk lid due to no good way to splice inside the travel tube. I then disconnected the wiring holders in the lid to get the slack I needed to pull the wires down the tube far enough to put a good wire wrap, on all wires to protect this from ever happening again. I tested the car and all functions in the trunk lid worked. I then went for a test drive and guess what we have cruise control again. The moral of the lesson is it may be true when your proctologist says you have a brain tumor and that Saab really needs a TSB on this one. I also thank my Saab tech for pointing me at the correct but less than obvious end of the car for the problem.
posted by 65.41.23...
, Fri, 3 Jun 2005 16:55:56
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