ECU Power Source Circuit [08/2021 - ]: Procedure
WARNING: This page is about a different car, the 2024 Toyota 4Runner, 2023 Toyota 4Runner, and 2022 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - BATTERY AND BODY GROUND)
- Disconnect the R1 parking assist ECU connector.
*a Rear view of wire harness connector
(to Parking Assist ECU) - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition R1-4 (GND1) - Body ground Always Below 1 Ω - Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition R1-1 (+B) - Body ground Always 11 to 14 V R1-8 (IG) - Body ground Ignition switch ON 11 to 14 V R1-9 (ACC) - Body ground Ignition switch ACC 11 to 14 V
Result:
OK
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [08/2021 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Disconnect the R1 parking assist ECU connector.