Two problems related to headlight switch have been reported for the 2004 Volvo XC90. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Volvo XC90 based on all problems reported for the 2004 XC90.
2004 Volvo Xc90 sudden engine stall with lose of headlights: I was traveling on the interstate at night with the cruise set at 75 mph when suddenly it was like someone turned the ignition key to off for about 3 seconds, and then turned the key back on without restarting the engine. With all the warning lamps illuminated, and the engine at a stall I pulled into the emergency lane, and stopped. I then shifted to park and attempted to start the vehicle, where it took several attempts to start. The headlights did not stop working while pulling over, and when I stopped I switched the lights off before I restarted the engine. The first thing at mind was a fuel pump that was starting to act up. After restarting I revved the engine up a few quick times (to clear the engines throat). I then got back on the interstate accelerating to 75 mph , but doing so manually this time(no cruise control). About 10 min had passed when suddenly the engine started losing power as I was having to press the accelerator harder to maintain speed. While still coasting at 65 mph or so I placed the transmission into neutral, and attempted to restart the engine, when I turned the key to the start position I lost all the lights, I quickly released the key to the on position, and the lights remained off. I quickly pulled to the emergency lane and used the force to avoid the guardrail and the ditch. All the warning light were illuminated, and the engine was at a stall. I then turned the ignition key off and then back on, and that restored the headlights. It took 5-8 attempts to restart the engine, and again I'm thinking fuel pump acting up. Each time I attempted to restart the engine it would spit and sputter like if the fuel pump were only delivering half the pressure needed for the fuel injectors. After the engine restarted I made it home, and the problem has not arisen since,.
I switched from headlights on to daylight driving lights on. I received a "bulb failure" for the daylight driving lights. I switched back to headlights. I received a "bulb failure" for the hids. I have verified that the fuses are good, and that there are now no working headlights on the car. Had this happened at night it could have been bad, very bad. Thank god it happened during a sunny day and that the teen driver wasn't behind the wheel.