DTC C1AAC: Vehicle Information Unmatched [02/2017 - 08/2020]: Procedure

WARNING: This page is about a different car, the 2020 Toyota C-HR, 2019 Toyota C-HR, and 2018 Toyota C-HR. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC OUTPUT (CAN COMMUNICATION DTC OUTPUT)

HINT:

The forward recognition camera communicates with the ECM via CAN communication. Confirm that the CAN communication system is functioning normally before proceeding.

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Chassis / LKA/LDA / Trouble Codes.

Check for DTCs.

Refer to DTC CHECK / CLEAR [02/2017 - 08/2020]

Chassis > LKA/LDA > Trouble Codes

Result

Result	Proceed to
DTC U0100 is not output	A
DTC U0100 is output	B

Result:

GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [02/2017 - 05/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [05/2018 - 09/2019] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 08/2020]

Result:

See step 2

READ VALUE USING TECHSTREAM

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Chassis / LKA/LDA / Data List.

Read the Data List according to the display on the Techstream.

Chassis > LKA/LDA > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Vehicle Information (2WD/4WD)	Vehicle information (drivetrain) stored in forward recognition camera	2WD, 4WD or Unknown	2WD: for 2WD 4WD: for AWD Unknown: Vehicle information not confirmed	-
Vehicle Information (Conv/HV)	Vehicle information (conventional/hybrid) stored in forward recognition camera	Conv, HV or Unknown	Conv: Conventional HV: Hybrid vehicle Unknown: Vehicle information not confirmed	-

Chassis > LKA/LDA > Data List

Tester Display
Vehicle Information (2WD/4WD)
Vehicle Information (Conv/HV)

HINT:

The vehicle information stored in the forward recognition camera is displayed on the Data List.
If the vehicle information stored in the forward recognition camera is different from the actual vehicle specifications, the vehicle information stored in the forward recognition camera may be incorrect. Check for DTCs and replace the forward recognition camera if necessary.
If the vehicle information stored in the forward recognition camera matches the actual vehicle specifications, the installed ECM is incompatible. Replace the ECM with a correct one.

Result

Result	Proceed to
Vehicle information stored in forward recognition camera and actual vehicle specifications do not match	A
Vehicle information stored in forward recognition camera and actual vehicle specifications match	B

Result:

REPLACE ECM. Refer to REMOVAL [02/2017 - 10/2017] , or refer to REMOVAL [10/2017 - 08/2020]

Result:

See step 3

CHECK DTC OUTPUT

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Chassis / LKA/LDA / Trouble Codes.
Clear the DTCs.
Refer to DTC CHECK / CLEAR [02/2017 - 08/2020]

Chassis > LKA/LDA > Clear DTCs
Make sure that the DTC detection conditions are met.
HINT:

If the following procedure is not performed, the previously output DTC cannot be detected.
1. Turn the ignition switch to ON and wait 2 seconds or more.

Check for DTCs.

Refer to DTC CHECK / CLEAR [02/2017 - 08/2020]

Chassis > LKA/LDA > Trouble Codes

Result

Result	Proceed to
DTC C1AAC is output	A
DTC C1AAC is not output	B

Result:

REPLACE FORWARD RECOGNITION CAMERA. Refer to REMOVAL [02/2017 - 08/2020]

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [02/2017 - 10/2017] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 05/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [05/2018 - 09/2019] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 08/2020]