1997 Lexus LS 400FACTORY OEM SERVICE PROCEDURE

Master Switch Test

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

MASTER SWITCH CONTINUITY TEST

Position Terminals No.
Driver's Switch
Off (Neutral) (1)
Up Auto 3, 5 & 10
Up 3 & 10
Down Auto 5, 9 & 10
Down 9 & 10
Right Front Switch
Off (Neutral) (1)
Up 4 & 10
Down 10 & 12
Left Rear Switch
Off (Neutral) (1)
Up 1 & 10
Down 7 & 10
Right Rear Switch
Off (Neutral) (1)
Up 2 & 10
Down 8 & 10
(1) Continuity should not exist between any terminals.
Fig 1: Identifying Master Switch Terminals
G93E83968Courtesy 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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