One problem related to headlight switch has been reported for the 2005 Mercury Mariner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Mercury Mariner based on all problems reported for the 2005 Mariner.
The contact owns a 2005 Mercury Mariner. While driving approximately 60 mph, the exterior headlights failed. The contact switched to the automatic light system. The vehicle was taken to the dealer where it was diagnosed as a light switch failure. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 150,000.