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Automatic Lighting Control Unit Input Test/Replacement

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before testing, 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. Disconnect the 14P connector (A) from the automatic lighting control unit (B).
    Fig 1: Identifying Automatic Lighting Control Unit & 14P Connector
    G05966293Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Inspect the connector and socket terminals to be sure they all making good contact.
    • If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
    • If the terminals are OK, go to step  4.
  4. With the connector still disconnected, do these input tests.
    • If any tests indicate a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, go to step  5.
    TEST CONDITION TABLE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    3 LT GRN Under all conditions Check for continuity between terminal No. 3 and under-dash fuse/relay box connector T (34P) terminal No. 29: There should be continuity. An open in the B-CAN wire
    4 WHT Under all conditions Check for continuity between terminal No. 4 and under-dash fuse/relay box connector T (34P) terminal No. 12: There should be continuity. An open in the B-CAN wire
    5 BLU / WHT Under all conditions Check for continuity between terminal No. 5 and automatic lighting sensor 5P connector terminal No. 1: There should be continuity. An open or high resistance in the wire
    6 BLU / RED Under all conditions Check for continuity between terminal No. 6 and automatic lighting sensor 5P connector terminal No. 3: There should be continuity. An open or high resistance in the wire
    14 BLU / BLK Under all conditions Check for continuity between terminal No. 14 and automatic lighting sensor 5P connector terminal No. 5: There should be continuity. An open or high resistance in the wire
    1 LT GRN Under all conditions Check for continuity between terminal No. 1 and under-dash fuse/relay box connector S (20P) terminal No. 11: There should be continuity. An open in the wire
  5. Reconnect the connectors, then do these input tests at the following connector.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, replace the automatic lighting control unit.
    TEST CONDITION TABLE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    11 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G403)
    • An open or high resistance in the wire
    12
    7 PNK Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
    • Blown No. 8 (7.5 A) fuse in the under-dash fuse/relay box
    • An open or high resistance in the wire
    • Faulty under-dash fuse/relay box
    9 BRN Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 7 (10 A) fuse in the under-dash fuse/relay box
    • An open or high resistance in the wire
    • Faulty under-dash fuse/relay box
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