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Toyota Service
Toyota Service, Toyota Expert
Category: Toyota
Satisfied Customers: 4730
Experience:  30+ Yrs of auto experience, Award Winning Svc. Manager; Just Answer Customer's Choice Award Winner
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Our 1999 4runner door locks are not responding to key fob.

Customer Question

Our 1999 4runner door locks are not responding to key fob. At same time the dash switch to activate rear hatch window is not working. Key fob battery has been replaced, still no fix. Took to dealer for this problem and engine ck lite issue. Dealer repaired items to clear eng. ck. lite issue and said locks and hatch window are working. Within 3 days key fob and window problem back.
Submitted: 6 months ago.
Category: Toyota
Expert:  Toyota Service replied 6 months ago.

Hello. Welcome to Just Answer. Please allow me to assist you. The issue you are having seems to be two unrelated things. The door locks and the rear window are on two different circuits. As a dealer employee, I can certainly understand your frustration when a dealer shop cannot satisfy your needs; that is what we are supposed to be doing when you vist out facilities. Now, to your questions:

Door Locks: The very first thing you need to do is that the Radio frequency (RF) strength measured by a device designed for this. Some auto parts stores have this tool, and all Toyota service departments are required to have this tool. It is prudent to measure the RF of the fobs before any other diagnosis is done, because older fob transmitters are known to lose their ability to broadcast a properly strong and continuous signal to the wireless door lock control receiver in the vehicle. If the signal is weak, or it is pulsing, the fob needs to be replaced and reprogrammed. As long as the interior door lock switch locks and unlocks the doors (you did not mention if they did or not), the issue iis in either the transmitter fob or the wireless door lock receiver under the dashboard.

Rear Hatch window: There was a bulletin issued in 1999 about intermittent rear window operation. An upgraded/redesigned rear door electronic control unit was available to rectify this condition.