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Home >> Acura >> 2007 >> RDX >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Entry Lights Control System >> MICU Input Test

MICU Input Test

  1. Before troubleshooting the entry lights control system, refer to B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
  2. Check the No. 10 (7.5 A) fuse in the under-dash fuse/relay box. If any fuse is blown, replace it and go to step 3.
  3. Disconnect under-dash fuse/relay box connectors E, F, K, R, and T.
    NOTE: All connector views are shown from wire side of female terminals.
    Fig 1: Identifying MICU Connectors (1 Of 2)
    G05446443Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 2: Identifying MICU Connectors (2 Of 2)
    G05446444Courtesy 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 appropriate connector.
    • 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.
    SYMPTOM CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    K4 PNK Interior light switch in middle (DOOR) position Attach to ground: The ceiling light and front individual map lights should come on.
    • Blown No. 22 (7.5 A) fuse in the under-hood fuse/relay box
    • Blown bulb(s)
    • Faulty ceiling light
    • Faulty front individual map light
    • Faulty interior light switch
    • Faulty junction box
    • An open in the wire
  6. Reconnect the connectors to the under-dash fuse/relay box, turn the ignition switch ON (II), 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, the MICU must be faulty; replace the under-dash fuse/relay box.
    SYMPTOM CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    E6 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.
    • Poor ground (G601)
    • An open in the wire
    E33 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.
    • Poor ground (G601)
    • An open in the wire
    F20 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.
    • Poor ground (G451)
    • An open in the wire
    T34 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.
    • Poor ground (G501)
    • An open in the wire
    E37 GRN Driver's door open Measure the voltage to ground: There should be less than 1 V.
    • Faulty driver's door switch
    • An open in the wire
    Driver's door closed Measure the voltage to ground: There should be 5 V or more.
    • Faulty driver's door switch
    • A short to ground in the wire
    E3 LT GRN Front passenger's door open Measure the voltage to ground: There should be less than 1 V.
    • Faulty front passenger's door switch
    • An open in the wire
    Front passenger's door closed Measure the voltage to ground: There should be 5 V or more.
    • Faulty front passenger's door switch
    • A short to ground in the wire
    E2 LT BLU Right rear door open Measure the voltage to ground: There should be less than 1 V.
    • Faulty right rear door switch
    • An open in the wire
    Right rear door closed Measure the voltage to ground: There should be 5 V or more.
    • Faulty right rear door switch
    • A short to ground in the wire
    E17 BRN Left rear door open Measure the voltage to ground: There should be less than 1 V.
    • Faulty left rear door switch
    • An open in the wire
    Left rear door closed Measure the voltage to ground: There should be 5 V or more.
    • Faulty left rear door switch
    • A short to ground in the wire
    R6 PNK Ignition key inserted into the ignition switch Measure the voltage to ground: There should be less than 1. V.
    • Poor ground (G502)
    • Faulty ignition key switch
    • An open in the wire
    Ignition key removed from the ignition switch Measure the voltage to ground: There should be 5 V or. more.
    • Faulty ignition key switch
    • A short to ground in the wire
    T31 BRN Driver door key cylinder switch unlocked Measure the voltage to ground: There should be less than 1 V.
    • Poor ground (G501)
    • Faulty driver door key cylinder switch
    • An open in the wire
    Driver door key cylinder switch in neutral Measure the voltage to ground: There should be 5 V or more.
    • Faulty driver door key cylinder switch
    • A short to ground in the wire
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