One problem related to wiring has been reported for the 2004 Buick Rainier. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Buick Rainier based on all problems reported for the 2004 Rainier.
This is my second complaint rising from the same issue, I own two 2004 Buick Rainier's and they both have had an issue with the low beam headlamp bulb and connector being melted due to poor connection. This is a costly repair since the gm parts catalog does not list a replacement connector, they would rather sell the entire headlamp assembly. The first complaint occurred on my other Rainier now this one. No headlamp is a safety concern, and due to the wiring overheating and melting could be a potential fire hazard.