1994 Lexus ES 300FACTORY OEM SERVICE PROCEDURE

Master Switch Test

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

MASTER SWITCH TEST

Window Switch & Position Window Lock Switch Position Terminal No.
Driver's Switch
Off (Neutral) (1) 3 & 4; 4 & 6
Up (1) 3 & 8; 4 & 6
Down (1) 3 & 4; 6 & 8
Right Front Switch
Off (Neutral) Unlock 4 & 11; 4 & 13
" Lock 11 & 13
Up Unlock 8 & 11; 4 & 13
" Lock 8 & 11
Down Unlock 4 & 11; 8 & 13
" Lock 8 & 13
Left Rear Switch
Off (Neutral) Unlock 4 & 10; 4 & 12
" Lock 10 & 12
Up Unlock 4 & 12; 8 & 10
" Lock 8 & 10
Down Unlock 4 & 10; 8 & 12
" Lock 8 & 12
Right Rear Switch
Off (Neutral) Unlock 4 & 7; 4 & 14
" Lock 7 & 14
Up Unlock 4 & 14; 7 & 8
" Lock 7 & 8
Down Unlock 4 & 7; 4 & 14
" Lock 8 & 14
(1) Position does not affect driver's switch.
Fig 1: Identifying Master Switch Terminals (ES300)
G93E83968Courtesy of Β© TOYOTA, LICENSE AGREEMENT TMS1002
Factory Service Tools

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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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