Power Switch Illumination Circuit [01/2019 - 09/2022]: Procedure

WARNING: This page is about a different car, the 2022 Toyota Corolla, 2021 Toyota Corolla, and 2020 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST USING TECHSTREAM

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / Smart Key / Active Test.

Perform the Active Test according to the display on the Techstream.

Body Electrical > Smart Key > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Power/Engine SW Light	Power switch illumination	OFF or ON	-

Body Electrical > Smart Key > Active Test

Tester Display
Power/Engine SW Light

Power switch illumination comes on.

Result

Proceed to
OK
NG

Result:

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [01/2019 - 04/2020] , or refer to PROBLEM SYMPTOMS TABLE [04/2020 - 09/2022]

Result:

See step 2

INSPECT POWER SWITCH

Remove the power switch.
Refer to REMOVAL [01/2019 - ]

Inspect the power switch.

Refer to INSPECTION [01/2019 - ]

Result

Proceed to
OK
NG

Result:

REPLACE POWER SWITCH. Refer to REMOVAL [01/2019 - ]

Result:

See step 3

CHECK HARNESS AND CONNECTOR (POWER SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

Disconnect the I1 certification ECU (smart key ECU assembly) connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
I119-5 (SWIL) - I1-10 (SWIL)	Always	Below 1 Ω
I119-3 (GND) - I1-11 (AGND)	Always	Below 1 Ω
I119-5 (SWIL) or I1-10 (SWIL) - Body ground	Always	10 kΩ or higher
I119-3 (GND) or I1-11 (AGND) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [01/2019 - 03/2019] , or refer to REMOVAL [03/2019 - 09/2022]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR