1996 Lexus SC 400FACTORY OEM SERVICE PROCEDURE

Power Main Relay Test

Remove relay. See ELECTRICAL COMPONENT LOCATIONS TABLEΒ  under DESCRIPTION & OPERATION. Replace relay if it does not operate as follows. See Fig 1.

  • No continuity should exist between terminals No. 3 and 5.
  • Apply battery voltage between terminals No. 1 and 2. Continuity should exist between terminals No. 3 and 5.
Fig 1: Identifying Power Main Relay Terminals
G96F07650Courtesy 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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