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Relay Circuit Board: Test

  1. Relay Circuit Board - Test
    GHH416516Courtesy of HONDA, U.S.A., INC.

    The relay circuit board is part of the under-hood fuse/relay box and contains these relay circuits:

    • A/C main relay circuit
    • Brake light relay circuit
    • Daytime running light relay circuit
    • IGA relay circuit
    • IGC relay circuit
    • Interior lights cut relay circuit
    • Security horn relay circuit
    • Taillight relay circuit

    NOTE:
    • Make sure the correct test lead (+ or -) is placed on the terminal.
    • When checking for continuity across the diode, use the diode setting ( ) on the digital volt/ohm meter to check the diode bias.
    • Remember this important operating characteristic; diode bias causes a diode to fully conduct electricity in one direction (forward), while not at all in the opposite direction (reverse).

    Daytime Running Light Relay Circuit and Interior Lights Cut Relay Circuit 

    Daytime running light relay circuit

    • There should be battery voltage at terminal B4 when 12 volt battery power is connected to terminal B12, and 12 volt battery ground is connected to terminal B10.
    • There should be no voltage at terminal B4 when terminal B10 is disconnected.

    Interior lights cut relay circuit

    • There should be battery voltage at terminal B1 when 12 volt battery power is connected to terminal B9, and 12 volt battery ground is connected to terminal A8.
    • There should be no voltage at terminal B1 when terminal A8 is disconnected.
    GHH416518Courtesy of HONDA, U.S.A., INC.

    Brake Light Relay Circuit and Security Horn Relay Circuit 

    Brake light relay circuit

    • There should be continuity between terminals C2 and C3, when 12 volt battery power is connected to terminal C4, and 12 volt battery ground is connected to terminal C5.
    • There should be no continuity between terminals C2 and C3, and there should be continuity between terminals C10 and C2 when terminal C5 is disconnected.

    Security horn relay circuit

    • There should be battery voltage at terminal B11 when 12 volt battery power is connected to terminal B5, and 12 volt battery ground is connected to terminal B2.
    • There should be no voltage at terminal B11 when terminal B2 is disconnected.
    GHH416519Courtesy of HONDA, U.S.A., INC.

    A/C Main Relay Circuit and IGA Relay Circuit 

    A/C main relay circuit

    • There should be battery voltage at terminal A3 when 12 volt battery power is connected to terminal A4, and 12 volt battery ground is connected to terminal A7.
    • There should be no voltage at terminal A3 when terminal A7 is disconnected.

    IGA relay circuit

    • There should be battery voltage at terminal B7 when 12 volt battery power is connected to terminal B3, and 12 volt battery ground is connected to terminal B8.
    • There should be no voltage at terminal B7 when terminal B8 is disconnected.
    GHH416520Courtesy of HONDA, U.S.A., INC.

    IGC Relay Circuit and Taillight Relay Circuit 

    IGC relay circuit

    • There should be battery voltage at terminal C6 when 12 volt battery power is connected to terminal B13, and 12 volt battery ground is connected to terminal C1.
    • There should be no voltage at terminal C6 when terminal C1 is disconnected.

    Taillight relay circuit

    • There should be battery voltage at terminal A1 when 12 volt battery power is connected to terminal A2, and 12 volt battery ground is connected to terminal A6.
    • There should be no voltage at terminal A1 when terminal A6 is disconnected.
    GHH416521Courtesy of HONDA, U.S.A., INC.
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