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Toyota Sienna 2010-2021 Owners Manual: If the electronic key does not operate properly (vehicles with a smart key system)

Toyota Sienna 2010-2021 Owners Manual / When trouble arises / Steps to take in an emergency / If the electronic key does not operate properly (vehicles with a smart key system)

If communication between the electronic key and vehicle is interrupted or the electronic key cannot be used because the battery is depleted, the smart key system and wireless remote control cannot be used. In such cases, the doors can be opened or the engine can be started by following the procedure below.

If the shift lever cannot be shifted from P
If the shift lever cannot be shifted with your foot on the brake pedal, there may be a problem with the shift lock system (a system to prevent accidental operation of the shift lever). Have the veh ...

Locking and unlocking the doors and key linked functions
Using the mechanical key in order to perform the following operations. Locks all the doors Unlocks the door(s) Turning the key rearward unlocks the driver’s door. Turning the key onc ...

Other materials:

Definition of terms
Terms Definitions Monitor Description Description of what ECM monitors and how to detect malfunctions (monitoring purpose and details). Related DTCs A group of diagnostic trouble codes that are output by ECM based on the same malfunction detection lo ...

Terminals of ECU
1. MULTIPLEX NETWORK GATEWAY ECU Disconnect the G4 ECU connector. Measure the voltage between the specified terminals on the wire harness side connector. If the result is not as specified, there may be a malfunction on the wire harness side. Measure the resistance between ...

Symptom confirmation and diagnostic trouble code
HINT: The diagnostic system in the SIENNA has various functions. The first function is the Diagnostic Trouble Code (DTC) check. A DTC is a code stored in the ECU memory whenever a malfunction in the signal circuits to the ECU occurs. In a DTC check, a previous malfunction's DTC can be ...

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