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Home >> Toyota >> 2012 >> Prius Three >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Smart Key System (For Entry Function) (Plug-In) (Diagnostics - Introduction)) >> SMART KEY SYSTEM (for Entry Function) >> Diagnosis System >> Diagnosis System
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Diagnosis System

WARNING: This page is about a different variant/trim than selected.
  1. DESCRIPTION 
    1. The certification ECU (smart key ECU assembly) controls the vehicle smart key system functions. Smart key system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3). In some cases, a malfunction may be occurring in the smart key system. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.
  2. CHECK DLC3 
    1. Check the DLC3. Refer to GENERAL INFORMATION .
  3. INSPECT AUXILIARY BATTERY VOLTAGE 
    1. Measure the auxiliary battery voltage with the power switch off.

      Standard Voltage

      11 to 14 V

      If the voltage is below 11 V, recharge or replace the auxiliary battery.

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