2012 Lexus HS 250hFACTORY OEM SERVICE PROCEDURE

Integration Relay: Inspection: Inspection

  1. INSPECT NO. 1 INTEGRATION RELAY 
    Fig 1: Identifying Integration Relay Diagram
    GTY270626Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TEXT IN ILLUSTRATION

    *1 Integration Relay
    1. IG2 RELAY:
      1. Measure the resistance according to the value(s) in the table below.
        Fig 2: Identifying Integration Relay Terminals
        GTY286697Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Integration Relay

        Standard Resistance

        Tester Connection Condition Specified Condition
        Integration relay (C-1) - Integration relay (A-4) Battery voltage is not applied between terminals A-2 and A-3 10 kΩ or higher
        Integration relay (C-1) - Integration relay (A-4) Battery voltage is applied between terminals A-2 and A-3 Below 1 Ω

        If the resistance is not as specified, replace the integration relay.

    2. EFI MAIN RELAY:
      1. Measure the resistance according to the value(s) in the table below.
        Fig 3: Identifying Integration Relay Terminals
        GTY286697Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Integration Relay

        Standard Resistance

        Tester Connection Condition Specified Condition
        Integration relay (C-1) - Integration relay (B-4) Battery voltage is not applied between terminals B-2 and B-3 10 kΩ or higher
        Integration relay (C-1) - Integration relay (B-4) Battery voltage is applied between terminals B-2 and B-3 Below 1 Ω

        If the resistance is not as specified, replace the integration relay.

    3. C/OPN RELAY:
      1. Measure the resistance according to the value(s) in the table below.
        Fig 4: Identifying Integration Relay Terminals
        GTY286697Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Integration Relay

        Standard Resistance

        Tester Connection Condition Specified Condition
        Integration relay (B-5) - Integration relay (B-8) Battery voltage is not applied between terminals B-6 and B-7 10 kΩ or higher
        Integration relay (B-5) - Integration relay (B-8) Battery voltage is applied between terminals B-6 and B-7 Below 1 Ω

        If the resistance is not as specified, replace the integration relay.

    4. BATT FAN RELAY:
      1. Measure the resistance according to the value(s) in the table below.
        Fig 5: Identifying Integration Relay Terminals
        GTY286697Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Integration Relay

        Standard Resistance

        Tester Connection Condition Specified Condition
        Integration relay (C-1) - Integration relay (A-8) Battery voltage is not applied between terminals A-6 and A-7 10 kΩ or higher
        Integration relay (C-1) - Integration relay (A-8) Battery voltage is applied between terminals A-6 and A-7 Below 1 Ω

        If the resistance is not as specified, replace the integration relay.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

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

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