Reverse Signal Circuit between Radio Receiver Assembly and Navigation ECU [06/2018 - 11/2022]: Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2023 Toyota GR Corolla, 2023 Toyota Corolla, 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.
- CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)
- Disconnect the I57 radio and display receiver assembly connector.
- Disconnect the I69 navigation ECU connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition I57-28 (REV2) - I69-19 (REV2) Always Below 1 Ω I57-28 (REV2) or I69-19 (REV2) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
OK
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [06/2018 - 01/2019] , or refer to PROBLEM SYMPTOMS TABLE [01/2019 - 03/2019] , or refer to PROBLEM SYMPTOMS TABLE [03/2019 - 09/2019] , or refer to PROBLEM SYMPTOMS TABLE [09/2019 - 04/2020] , or refer to PROBLEM SYMPTOMS TABLE [04/2020 - 09/2022] , or refer to PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR