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Power Seat Control Unit Input Test

NOTE: Before testing, troubleshoot the multiplex integrated control system 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 driver's seat (see FRONT SEAT REMOVAL/INSTALLATION ).
    NOTE: Be careful not to scratch the interior trim.
  3. Disconnect the 40P connector (A) and 18P connector (B) from the power seat control unit(C).
    Fig 1: Identifying 40P Connector And 18P Connector
    G06160966Courtesy 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, do the input test 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.
    POSSIBLE CAUSE RESULT REFERENCE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A39 BLK Under all conditions Check for continuity between the terminal A39 and power tilt/ telescopic steering control unit connector A (16P) terminal No. 11.
    There should be continuity.    		 An open in the wire
  6. Reconnect the connectors to the power seat control unit, and do 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 control unit must be faulty; replace it.
    POSSIBLE CAUSE RESULT REFERENCE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A9 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
    B4 BLK
    B18 BLK
    A35 BLK/YEL Ignition switch ON (II) Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
    • An open in the wire
    A37 BLU Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 15 (40 A) fuse in the under-hood fuse/relay box
    • Blown No. 7 (10 A) fuse in the driver's under-dash fuse/relay box
    • An open in the wire
    B1 RED Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 20 (40 A) fuse in the under-hood fuse/relay box
    • Blown No. 16 (20 A) fuse in the driver's under-dash fuse/relay box
    • An open in the wire
    B8 BLU Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 20 (40 A) fuse in the under-hood fuse/relay box
    • Blown No. 14 (20 A) fuse in the driver's under-dash fuse/relay box
    • An open in the wire
    A31 BLK/BLU Shift lever in P Measure the voltage to ground:
    There should be less than 1 V.
    • Faulty transmission range switch
    • An open in the wire
    Shift lever out of P Measure the voltage to ground:
    There should be about 10 V.    		 A short to ground in the wire
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