One problem related to warning light on has been reported for the 2003 Lexus RX. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Lexus RX based on all problems reported for the 2003 RX.
Six months ago, the drivers side seat belt warning light came on. Two weeks ago, the drivers side air bag warning light came on. This appears to be a wide spread issue with these Lexus Rx 300's evidenced by the numerous complaints logged on the web. My car was garage kept for the majority of it's life. This issue should not be happening and should be repaired by Lexus at no cost to the consumer.