LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1999 >> GS 400 >> Repair and Diagnosis >> Body & Frame >> Power Windows >> Circuit Tests >> One-Touch System Circuit
April 5, 2026: LEMON Manuals is launched! Read the announcement.

One-Touch System Circuit

  1. Disconnect driver door ECU harness connector. Using an ammeter, connect positive lead to terminal No. 8 of harness connector, and negative lead to negative terminal of battery. See Fig 1. Using a jumper wire, connect battery positive to terminal No. 17 at harness connector.
  2. As window travels downward, amperage should be about 7 amps. Ensure amperage increases to 14.5 amps or greater when window reaches end of travel. With voltage still applied, amperage should decrease to less than one amp within 4-90 seconds as thermistor inside window motor opens. If operation is not as specified, replace window motor.
Fig 1: Testing One-Touch System Circuit
G99J51515Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002