Diagnosis System [08/2013 - ]

WARNING: This page is about a different car, the 2018 Toyota Corolla, 2017 Toyota Corolla, 2016 Toyota Corolla, 2015 Toyota Corolla, and 2014 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

DESCRIPTION
The certification ECU (smart key ECU assembly) stores DTCs when malfunctions occur.

The diagnostic system allows for reading of the DTCs from the DLC3.

Use the Techstream to check for malfunctions and perform repairs.
CHECK DLC3
1. Check the DLC3.
  Refer to GENERAL INFORMATION [08/2013 - ]
INSPECT BATTERY VOLTAGE
1. Measure the vehicle battery voltage.
  Standard Voltage
  
  11 to 14 V
  
  If the voltage is below 11 V, recharge or replace the battery.

SELF-DIAGNOSTIC MODE (USING TECHSTREAM)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.

Enter the following menus: Body Electrical / Smart Key / Utility / Wireless Door Lock Diagnosis Mode.

Body Electrical > Smart Key > Utility

Tester Display
Wireless Door Lock Diagnosis Mode

Proceed to the next step in accordance with the prompts on the Techstream screen.
Check that the system has switched to self-diagnostic mode by checking the wireless door lock buzzer output pattern.

Fig 1: Wireless Door Lock Buzzer Output Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the diagnostic outputs when an electrical key transmitter sub-assembly switch is pressed. The diagnostic outputs can be checked by the wireless door lock buzzer sounding pattern.

Fig 2: Wireless Door Lock Buzzer Sounding Pattern

RESULT

Wireless Door Lock Buzzer Output	Suspected Area
A	Normal (No malfunction)
B	Register wireless code
C	Wave interference or malfunction of a related component