ECU Power Source Circuit [12/2013 - 11/2016]: Procedure
WARNING: This page is about a different car, the 2016 Toyota Highlander, 2015 Toyota Highlander, and 2014 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK DRIVING SUPPORT ECU ASSEMBLY (B VOLTAGE)
- Disconnect the F84 driving support ECU assembly connector.
*a Front view of wire harness connector
(to Driving Support ECU Assembly) - Turn the engine switch on (IG).
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition F84-30 (B) - Body ground Engine switch on (IG) 11 to 14 V - Turn the engine switch off.
- Reconnect the F84 driving support ECU assembly connector.
Result
Proceed to OK NG
Result: 2
NG
REPAIR OR REPLACE POWER SOURCE CIRCUIT
Result: 1
OK
See step 2
- Disconnect the F84 driving support ECU assembly connector.
- CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - BODY GROUND)
- Disconnect the F84 driving support ECU assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open)
Tester Connection Condition Specified Condition F84-25 (GND) - Body ground Always Below 1 Ω - Reconnect the F84 driving support ECU assembly connector.
Result
Proceed to OK NG
Result: 1
OK
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [12/2013 - 11/2016]
Result: 2
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - BODY GROUND)