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.
Test 37, Check For IDM Short To VBAT In Harness
With key off and ECA disconnected, set DVOM to 20-volt scale. Turn key on, leaving engine off. Measure voltage between breakout box pins No. (+) J41 (IDM E) and (-) J7 (BAT -). If voltage is greater than 0.5 volt, IDM is shorted to VBAT between EDIS module and ECA. Repair short circuit. Remove all test equipment, and reconnect all components. Clear Continuous Memory, and check for fault codes.
If voltage is less than 0.5 volt, IDM is shorted to another wire between EDIS module and ECA. Repair short or replace harness. Remove all test equipment, and reconnect all components. Clear Continuous Memory, and check for fault codes.
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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.