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.
1990 Mitsubishi SigmaFACTORY OEM SERVICE PROCEDURE
Power Window Timer
- Open the glove compartment and connect a voltmeter between terminal for ETACS and terminal for ground, or connect the multi-use tester to the diagnosis connector. See Fig 1 .
- Check to be sure that voltage should be output as follows, with the ignition key OFF, and door switch ON (door opened), when each switch is operated. If there is no output of a voltage pattern at all, or if the buzzer does not sound, check for a malfunction of that switch for damaged or disconnected wiring. Ignition Switch (ON/OFF, ACC/OFF) & Front door switch are to be tested. See Fig 2 and Fig 3 .
Factory Service Tools
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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.