2000 Lexus SC 400FACTORY OEM SERVICE PROCEDURE

One-Touch System Circuit

NOTE: During window operation, contacts of circuit breaker inside power window motor will open within 4-40 seconds at end of window travel if power is continually applied. All ammeter readings should be taken before circuit breaker contacts open.

Disconnect master switch. Using ammeter, connect positive lead to terminal No. 10 of master switch harness connector. See Fig 1. Connect negative lead to negative battery terminal. Using jumper wire, jumper terminal No. 9 of master switch harness connector to battery positive. As window travels downward, ammeter should indicate about 7 amps. When window reaches end of travel, ammeter should indicate 14.5 amps or greater.

Fig 1: Checking One-Touch System Circuit Current Draw
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.