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Door Multiplex Control Unit Input Test

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in 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 power window master switch (see REAR POWER WINDOW SWITCH TEST ).
    NOTE: Be careful not to scratch the door trim.
  3. Disconnect the 37P connector (A) from the power window master switch (B).
    Fig 1: Identifying Power Window Master Switch And 37P Connector
    G06946947Courtesy 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. Reconnect the connector to the power window master switch, and do the following input tests:
    • 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.
    WIRE TEST CONDITION CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    13 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 15 (10 A) fuse in the under-hood fuse/relay box
    • An open or high resistance in the wire
    14 LT GRN Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
    • Blown No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box
    • An open or high resistance in the wire
    25 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 3-4 (DR F/B) (60 A) fuse in the under-hood fuse/relay box
    • Blown No. 24 (20 A) fuse in the driver's under-dash fuse/relay box
    • An open or high resistance in the wire
    32 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G501)
    • An open or high resistance in the ground wire
    37 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G502)
    • An open or high resistance in the ground wire
    16 RED Ignition switch ON (II), position 2 button pressed Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G501)
    • Faulty driving position memory switch
    • An open or high resistance in the wire
    Ignition switch ON (II), position 2 button released Measure the voltage to ground: There should be about 5 V.
    • Faulty driving position memory switch
    • A short to ground in the wire
    17 GRY Ignition switch ON (II), position 1 button pressed Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G501)
    • Faulty driving position memory switch
    • An open or high resistance in the wire
    Ignition switch ON (II), position 1 button released Measure the voltage to ground: There should be about 5 V.
    • Faulty driving position memory switch
    • A short to ground in the wire
    19 YEL Ignition switch ON (II), SET button pressed Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G501)
    • Faulty driving position memory switch
    • An open or high resistance in the wire
    Ignition switch ON (II), SET button released Measure the voltage to ground: There should be about 5 V.
    • Faulty driving position memory switch
    • A short to ground in the wire
  6. Turn the ignition switch to LOCK (0)
  7. Disconnect the connector from the power window master switch, and do the following input tests:
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, the door multiplex control unit must be faulty; replace the power window master switch (see REAR POWER WINDOW SWITCH TEST ).
    NOTE: After replacing the power window master switch, reset the power window control unit (see RESETTING THE POWER WINDOW CONTROL UNIT ).
    WIRE TEST CONDITION CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    4 GRN Under all conditions Connect terminals No. 25 and No. 4: The driving position memory switch indicator 2 should come on.
    • Faulty driving position memory switch
    • Faulty LED
    • Poor ground(G501)or an open in the ground wire
    • An open or high resistance in the wire
    6 PUR Under all conditions Connect terminals No. 25 and No. 6: The driving position memory switch indicator 1 should come on.
    • Faulty driving position memory switch
    • Faulty LED
    • Poor ground(G501) or an open in the ground wire
    • An open or high resistance in the wire
    26 PNK Ignition switch ON (II) Connect terminals No. 14 and No. 26: The driving position memory switch lights should come on.
    • Faulty driving position memory switch
    • Faulty LED
    • Poor ground(G501)or an open in the ground wire
    • An open or high resistance in the wire
    33 BLU Under all conditions (disconnect power seat control unit connector A (40P)) Check for continuity between terminal No. 33 and power seat control unit connector A (40P) terminal No. 39: There should be continuity. An open in the B-CAN wire
    35 PNK Under all conditions (disconnect power seat control unit connector A (40P)) Check for continuity between terminal No. 35 and power seat control unit connector A (40P) terminal No. 40: There should be continuity. An open in the B-CAN wire
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