Tahoe Ignition Switch above with faulty internal section feeding AC/Heater, Cruise Control, 4 Wheel Drive, and Anti-loc brakes
It’s time for another inside baseball episode of auto repair. I ran across a very interesting case yesterday. A customer brought in his 1999 Chevy Tahoe SUV with 5.7L engine. Everything had been fine until he stopped at the store for a moment. When he got back in it to go home a few minutes later the AC/Heater blower, cruise control, 4 wheel drive and anti-loc brakes weren’t working and his anti-loc brake warning light was on. When something like this appears the first step is to find out if all the circuits were being fed from the same power source. They were - the ignition switch to the fuse panel and then to the circuits. The fuses were fine but reading very low voltage as was the power lead from the ignition switch. Since the other power functions were fine from the ignition switch, I figured rightly it was a bad section in the ignition switch. I’m blogging this in case someone out there with one of these vehicles (the Tahoe ignition stayed basically the same well into the 2000’s) would not miss the ignition switch as a culprit. Only a professional should attempt the replacement of this type of ignition switch as it means removal of the air bag module, steering wheel and special tools for the ignition switch fasteners.