I recently picked up a 2010 5th 4Runner. The anti-theft light, security light, is on and flashing when I am driving. Is there any way to get it to shut off? A reset procedure? Thanks Phil

2010 4Runner SR5
Black 4WD

Hi Phil,

Before doing an ECU RESET, check a few things. Be sure that the Thieves didn't damage any of the door-locks e.g., Tail-gate, Hood-lock...etc! Because if there's still an ACTIVE FAULT in ANY of the systems, a RESET won't Stop the security system light from blinking [permanently]; it'll come back on once the system see's a breach in that system!

So find out what-cha can about any damage that may have been done to the truck during the theft... and if you don't find anything Obvious, then Reset the ECUs/PCM by disconnecting the battery (Both Terminals), and use a jumper wire to join the POS and NEG battery cables together for about 10 minutes. Remove the jumper wire and Reconnect the battery terminals to the battery!

Start the engine... it'll run for 2 seconds, and SHUT-DOWN! This is Normal. Re-start the engine and now the COMPU's have been RESET! See if the security system light went out(?)... If it did, you resolved the issue. If NOT, take the truck to Auto-Zone and let them scan it for DTC's (Diagnostic Trouble Codes)! That'll tell you why the security system light is on!

Let us know, ~rig~ Regards!

thank you. I checked for issues with the doors, cargo tailgate and hood. Nothing was obvious. I did the reset. Like you said, it started and shut down. Started again and the security light kept flashing. Now to check the codes. Thanks again. Phil