Lexus Owner Discovers Loose Sensor After Wiper Failure

A Lexus owner discovered his windshield wipers wouldn’t activate during rain. Despite repeatedly toggling the wiper control lever with no success, the wipers suddenly sprang to life the moment he lightly pressed the windshield just behind the rearview mirror. It turned out his 2004 LS430 was equipped with rain-sensing wipers, and the sensor—located at the top of the windshield—had become loose due to age or improper installation during a previous windshield replacement, rendering it inoperative. Pressing the glass temporarily reseated the sensor against the windshield, triggering the system. This issue is relatively common in older Toyota and Lexus models. The fix is straightforward: re-secure or replace the sensor assembly, with the part costing around $108 and labor ranging from approximately $81 to $118. Experts caution that rather than relying on “manual activation,” drivers should get the system properly repaired to ensure safe driving conditions.