1996 Lexus SC 400FACTORY OEM SERVICE PROCEDURE

Master Switch Test

Remove master switch. Check for continuity between specified terminals of master switch. See Fig 1. Refer to the appropriate MASTER SWITCH CONTINUITY TESTΒ  table. If continuity is not as specified, replace master switch.

MASTER SWITCH CONTINUITY TEST

Window Switch & Position Window Lock Switch Position Terminals No.
Driver's Switch
Off (Neutral) (1) 8 & 9; 8 & 10
Up (1) 4 & 10; 8 & 9
Down (1) 4 & 9; 8 & 10
Passenger's Switch
Off (Neutral) Unlock 5 & 8; 7 & 8
" Lock 5 & 7
Up Unlock 4 & 5; 7 & 8
" Lock 4 & 5
Down Unlock 4 & 7; 5 & 8
" Lock 4 & 7
(1) Position does not affect driver's switch.
Fig 1: Identifying Master Switch Terminals
G93I83970Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
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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.

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