Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Side Auto Step ECU Power Source Circuit [08/2015 - ]: Procedure
- CHECK HARNESS AND CONNECTOR (SIDE AUTO STEP CONTROLLER ECU - BODY GROUND)
- Disconnect the A41 side auto step controller ECU assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A41-1 (GND) - Body ground Always Below 1 Ω
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 2
- CHECK HARNESS AND CONNECTOR (POWER SOURCE)
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A41-4 (B) - Body ground Always 11 to 14 V
Result:
A
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
(Refer to PROBLEM SYMPTOMS TABLE [08/2015 - ] )
Result:
B
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Measure the voltage according to the value(s) in the table below.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.