The designers of the Lexus navigation system have developed a reputation for systems that can track down even the most "tough to find" locations. But electronics by any company, no matter their reputation, can run into problems. Sometimes the issue can be easily resolved by simply unplugging the navigation system's computer. Knowing how to reset your navigation system can save owners a costly repair bill.
Set the hand brake, remove the key from the ignition switch, and open the bonnet.
Disconnect the negative battery lead from the battery terminal using the adjustable wrench. This will prevent any possibility of shock or shorting during the project.
Remove everything from the boot including any protective mats lining the bottom of the boot and leave the boot open.
Lift up the panel in the boot that covers your spare tire.
Locate a square metallic box on the right side of the boot. Use the screwdriver to remove the two screws holding the box in place.
Unplug the all of the wires connected to the box. Remembering where each wire is connected to the box is unimportant. Each of the wires is designed to plug into only one slot. Remove the box from the back of the car once all the wires are disconnected.
Unscrew the eight screws that hold the boxes rear panel in place to reveal two electronics boards.
Disconnect the left electronics board and flip it over so you can see where the two ribbon cables connect.
Disengage the two brown coloured clamps that hold the ribbon wire in place on either side of the electronics board using your fingers. Disconnect the ribbon wires. Let the apparatus sit disconnected for one minute while the computer resets.
Reassemble the navigation system following the steps given in reverse order.
Turn on the vehicle and test to make sure the system is working properly. Follow the directions on the screen.
This article is written for the 2001-'06 Lexus LS430 but is applicable for any Lexus or Toyota with the same navigation system.
Always disconnect the battery when working on automobile electronics.