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HOMESERVICE MANUALSACURA2008MDXREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESMULTIPLEX INTEGRATED CONTROL SYSTEMRELAY CONTROL MODULE INPUT TEST
2008 Acura MDX

Relay Control Module Input Test

2008 Acura MDXSECTION Relay Control Module Input Test
NOTE: Before testing the relay control module, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A  ).
  1. Turn the ignition switch to LOCK (0).
  2. Remove the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ).
  3. Disconnect under-hood fuse/relay box connectors D (10P) and E (14P).
    Fig 1: Identifying Under-Hood Fuse/Relay Box Connectors D (10P) And E (14P)
    G05487867Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Inspect the connector and socket terminals to be sure they are all making good contact.
    • If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
    • If the terminals look OK, go to step 5.
  5. With the connectors still disconnected, make these input tests at the connectors.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, go to step 6.
    INPUT TESTS REFERENCE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    E1 LT GRN Under all conditions (Under-dash fuse/relay box connector D(17P) disconnected Check for continuity between the E1 terminal and the under-dash fuse/ relay box connector D (17P) No. 11 terminal:
    There should be continuity.    		 An open in the wire
    Check for continuity to ground:
    There should be no continuity.    		 A short to ground in the wire
  6. Reconnect the connectors, and make these input tests at the connectors.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, replace the relay control module.
    INPUT TESTS REFERENCE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    D4 BLK Under all conditions Measure the voltage to ground:
    There should be less than 0.5 V.
    • Poor ground (G401)
    • An open in the wire
    D6 WHT Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 4 (40 A) fuse in the main under-hood fuse box
    • Blown No. 7 (10 A) fuse in the under-dash fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open in the wire
    D7 YEL Ignition switch ON (ID Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open in the wire
RENDER: 1.0x

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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.