Electric windows from switch to motor
Window does nothing from one switch, but works from another — or both switches appear dead.
What this lesson covers
CORE TEACHING Basic reversing-polarity motor circuit; modern door module; master switch requests; anti-trap; motor feedback; power/ground. PRACTICAL DEMONSTRATIONS AND TESTS Operate window; test motor connector in both directions; observe polarity reversal or module-controlled outputs; scan switch status. ADVANCED / SCAN TOOL LAYER Scope LIN/CAN door command where relevant; scope motor current for binding/anti-trap. KEY DIAGNOSTIC QUESTIONS Does switch request reach module? Does module command output? Is motor fed? Does polarity reverse? MUST-COVER CHECKPOINTS Map simple vs module-controlled architecture; prove heavy power and ground; verify switch/request; command output; measure load current; inspect signal/network where used.
What you will be able to do
Window does nothing from one switch, but works from another — or both switches appear dead.
Where it sits in the programme
- Builds on
- Lesson 26: Testing actuators: motors, solenoids and valves
- Feeds into
- Lesson 28: Electric mirrors