Having problems with your 1999 Toyota Avalon ?
Horn and parking lights flash off and on randomly after auto is started and while driving
Sounds like alarm system problem is there a car starter installed and not properly installed or antivol system and do you have a hood switch that is broke try to disconnect hood switch to see if this will stop as well if you have a car starter installed maybe to unplug and testthe original alarm system or contact dealer for tsbs on alarm system problems
Repair Help & Product Troubleshooting for 1999 Toyota Avalon
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.