2023 Acura MDX BaseFACTORY OEM SERVICE PROCEDURE

Power Relay Test: Test

How to use this service information .

NOTICE: 

When working with a vehicle equipped with the electronic air suspension, be sure to set it to the leveling off mode to prevent unexpected operation. Refer to the Electronic Air Suspension System Service Precautions - Refer to: Electronic Air Suspension System Connector Fitting Precautions or Electronic Air Suspension System Service Precautions for the procedure.

  1. Power Relay - Test

    Preconditions 

    • Relay Removed

    Procedure/Specifications 

    Use this chart to identify the type of relay, then do the test listed for it.

    Relay Test
    Active control engine mount (ACM) control relay (3.5 L engine) Normally-open four-terminals type
    A/C condenser fan relay (3.5 L engine)
    Cargo area accessory power socket relay
    DC-DC converter ACC relay ('22-24 USA and Canada models/'25)
    DC-DC converter IG1 relay 1
    DC-DC converter IG1 relay 2
    Electronic throttle control system (ETCS) control relay (3.5 L engine)
    Front console accessory power socket relay ('22-24)
    Horn relay
    Injector relay
    Left second row seat with one-touch access relay
    PGM-FI main relay 1
    RFC relay 1 (3.0 L engine)
    RFC relay 2 (3.0 L engine)
    Radiator fan relay (3.5 L engine)
    Right second row seat with one-touch access relay
    SH-AWD relay (With AWD)
    Fan control relay (3.5 L engine) Five-terminals type

    Normally-Open Four-Terminals Type 

    Check the relay according to the table. (Figure 1 and 2)

    Figure 1 

    GHH659063Courtesy of HONDA, U.S.A., INC.

    Figure 2 

    GHH659064Courtesy of HONDA, U.S.A., INC.

    Five-Terminals Type 

    • Check the relay according to the table. (Figure 3, 4, and 5)

    Figure 3 (Battery power is not applied) 

    GHH659065Courtesy of HONDA, U.S.A., INC.

    Figure 4 (Battery power is applied) 

    GHH659066Courtesy of HONDA, U.S.A., INC.

    Figure 5 

    GHH659067Courtesy of HONDA, U.S.A., INC.

    Result 

    • If the result is not as specified, replace the power relay.
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:

  • • 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.

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