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.
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HOMESERVICE MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISBODY AND FRAMELOCKSKEYLESS ENTRYTESTING AND INSPECTIONDESCRIPTION OF BMW DIAGNOSTIC SYSTEMSYSTEMATIC TROUBLESHOOTINGWIRE TESTINGSIGNAL TEST USING OSCILLOSCOPE
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Signal Test Using Oscilloscope
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Signal Test Using Oscilloscope
Image Legend:
1 D+, blue
2 Terminal 1, black
3 Terminal 31, brown
Signal Test Using Oscilloscope:
Measuring instrument: BMW SERVICE TESTER
Test lead: Terminal 1, black; Terminal D+, blue; Terminal 31, brown
Test Procedure
Connect terminal 31 to vehicle ground, connect terminal 1 and terminal 0+ to the wire to be tested.
To facilitate triggering, the lead terminal 1 (black) can be connected to the lead "FREQ OFF" (blue). (-> Frequency for triggering specified).
Select *M* for multimeter and "22" for oscilloscope.
The measured signal is displayed on the oscilloscope.
RENDER: 1.0x
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.