One problem related to high/low beam switch has been reported for the 2005 Chevrolet Impala. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Chevrolet Impala based on all problems reported for the 2005 Impala.
Low beam malfunction. Low beam connector completely fried. Connector melted on to the bulb. 3-5 bulbs need to be replaced each month and must take it to the auto shop to have a new connector placed on as well. Chevy would not help, said it was not covered under warranty. Dealer said that my whole electrical system would have to be re-done because there is too much power running to the bulbs. Price estimate $3500.