Inspection Using Ammeter

1990 Toyota 4Runner 2D Utility, 3.0 V, AutomaticSECTION Inspection Using Ammeter

Disconnect the connector from the master switch. Connect the positive (+) lead from the ammeter to terminal No. 6 on the wire harness side connector and the negative (-) lead to negative terminal of the battery. Connect the positive (+) lead from the battery to terminal No. 13 on the wire harness side connector. As the window goes down, check that the current flows about 7 amps. Check that the current increases about 14.5 amps or more when the window stops going down.

NOTE: The circuit breaker opens some 4-40 seconds after the window stops going down, so that check must be made before the circuit breaker operates. If the operation is as specified, replace the master switch.
RENDER: 1.0x

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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.