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Power Window System Current Test: Tacoma

WARNING: This page is about a different car, the 1999 Toyota Tacoma, 1999 Toyota Sienna, 1999 Toyota RAV4, 1999 Toyota Land Cruiser, and 1999 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect driver's power window switch connector. Connect positive lead of ammeter to driver's power window switch harness connector terminal No. 4. See Figure.
  2. Connect ammeter negative lead to negative terminal of 12-volt battery. Turn ignition switch to ON position. Connect a jumper wire from positive battery terminal to driver's power window switch harness connector terminal No. 9.
  3. As driver's window is lowered, current should be about 7 amps. When window reaches fully opened position, current should increase to about 14.5 amps or more. If current is as specified, replace driver's power window switch. If current is not as specified, check and repair appropriate circuit.
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