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Power Seat Control Unit Input Test/Replacement

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 Honda Crosstour, 2014 Honda Crosstour, 2013 Honda Crosstour, 2012 Honda Crosstour, and 2011 Honda Accord Crosstour. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  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 18P connector (A) and 40P connector (B) from the power seat control unit (C).
    Fig 1: Identifying 18P Connector (A) And 40P Connector And Power Seat Control Unit
    G06420558Courtesy of ABLE BODY CORP.
  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 next step.
  5. Reconnect the connectors to the power seat control unit, 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.
      CONNECTOR INPUT TESTS REFERENCE

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      B27 BLK/YEL Ignition switch ON (II) Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. B2 (7.5 A) fuse in the driver's under-dash fuse/relay box
      • An open or high resistance in the wire
      B25 BLU Under all conditions Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. A15 (10 A) fuse in the under-hood fuse/relay box
      • An open or high resistance in the wire
      A8 PNK Under all conditions Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. A3-4 (DR F/B STD) (60 A) fuse in the under-hood fuse/relay box
      • Blown No. B21 (20 A) fuse in the driver's under-dash fuse/relay box
      • An open or high resistance in the wire
      A1 LT BLU Under all conditions Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. A3-4 (DR F/B STD) (60 A) fuse in the under-hood fuse/relay box
      • Blown No. B19 (20 A) fuse in the driver's under-dash fuse/relay box
      • An open or high resistance in the wire
      B12 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G801)
      • An open or high resistance in the ground wire
      A5 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G801)
      • An open or high resistance in the ground wire
      A9 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G801)
      • An open or high resistance in the ground wire
      B35 BLK/BLU Shift lever in P position Measure the voltage to ground:
      There should be less than 0.2 V.
      • Faulty transmission range switch
      • Poor ground (G101) or an open in the ground wire
      • An open or high resistance in the wire
      Shift lever in any other position than P Measure the voltage to ground:
      There should be about 5 V.
      • Faulty transmission range switch
      • A short to ground in the wire
      B6 PUR Run the power seat motors Measure the voltage to ground:
      There should be at least about 10 V.
      • Faulty position sensor
      • A short to ground in the wire
      B11
      .
      B32      		 GRN
      .
      WHT      		 Run the recline motor Measure the voltage between terminals B11 (+) and B32(-):
      There should be about 2.5 V average.
      • Faulty position sensor
      • An open or high resistance in the wire
      • A short to ground in the wire
      B10
      .
      B32      		 BRN
      .
      WHT      		 Run the slide motor Measure the voltage between terminals B10 (+) and B32(-):
      There should be about 2.5 V average.
      • Faulty position sensor
      • An open or high resistance in the wire
      • A short to ground in the wire
      B9
      .
      B32      		 PNK
      .
      WHT      		 Run the front up-down motor Measure the voltage between terminals B9 (+) and B32 (-):
      There should be about 2.5 V average.
      • Faulty position sensor
      • An open or high resistance in the wire
      • A short to ground in the wire
      B8
      .
      B32      		 YEL
      .
      WHT      		 Run the rear up-down motor Measure the voltage between terminals B8 (+) and B32 (-):
      There should be about 2.5 V average.
      • Faulty position sensor
      • An open or high resistance in the wire
      • A short to ground in the wire
      B20
      .
      B14      		 LT BLU
      .
      BLU      		 Slide switch in FORWARD position Measure the voltage between the terminals:
      There should be less then 0.2 V.
      • Faulty driver's power seat adjustment switch
      • An open or high resistance in the wire
      B20
      .
      B37      		 LT BLU
      .
      BRN      		 Slide switch in BACKWARD position Measure the voltage between the terminals:
      There should be less then 0.2 V.
      • Faulty driver's power seat adjustment switch
      • An open or high resistance in the wire
      B20
      .
      B15      		 LT BLU
      .
      GRY      		 Recline switch in FORWARD position Measure the voltage between the terminals:
      There should be less then 0.2 V.
      • Faulty driver's power seat adjustment switch
      • An open or high resistance in the wire
      B20
      .
      B38      		 LT BLU
      .
      RED      		 Recline switch in BACKWARD position Measure the voltage between the terminals:
      There should be less then 0.2 V.
      • Faulty driver's power seat adjustment switch
      • An open or high resistance in the wire
      B20
      .
      B16      		 LT BLU
      .
      LT GRN      		 Front up-down switch in UP position Measure the voltage between the terminals:
      There should be less then 0.2 V.
      • Faulty driver's power seat adjustment switch
      • An open or high resistance in the wire
      B20
      .
      B17      		 LT BLU
      .
      WHT      		 Front up-down switch in DOWN position Measure the voltage between the terminals:
      There should be less then 0.2 V.
      • Faulty driver's power seat adjustment switch
      • An open or high resistance in the wire
      B20
      .
      B39      		 LT BLU
      .
      BLU      		 Rear up-down switch in UP position Measure the voltage between the terminals:
      There should be less then 0.2 V.
      • Faulty driver's power seat adjustment switch
      • An open or high resistance in the wire
      B20
      .
      B18      		 LT BLU
      .
      ORN      		 Rear up-down switch in DOWN position Measure the voltage between the terminals:
      There should be less then 0.2 V.
      • Faulty driver's power seat adjustment switch
      • An open or high resistance in the wire
  6. Turn the ignition switch to LOCK (0), then disconnect the connectors from the power seat control unit, 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 control unit must be faulty; replace it.
      CONNECTOR INPUT TESTS REFERENCE

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      B22 BLU Under all conditions (disconnect the door multiplex control unit 37P connector) Check for continuity between terminal B22 and door multiplex control unit 37P connector terminal No. 30:
      There should be continuity.      		 An open in the B-CAN wire
      Under all conditions (disconnect the immobilizer-keyless control unit 7P connector) Check for continuity between terminal B22 and immobilizer-keyless control unit 7P connector terminal No. 5:
      There should be continuity.      		 An open in the B-CAN wire
      B21 PNK Under all conditions (disconnect the door multiplex control unit 37P connector) Check for continuity between terminal B21 and door multiplex control unit 37P connector terminal No. 28:
      There should be continuity.      		 An open in the B-CAN wire
      Under all conditions (disconnect the immobilizer-keyless control unit 7P connector) Check for continuity between terminal B21 and immobilizer-keyless control unit 7P connector terminal No. 4:
      There should be continuity.      		 An open in the B-CAN wire
      B23 BLK Disconnect the power mirror control unit 24P connector Check for continuity between terminal B23 and power mirror control unit 24P connector terminal No. 24:
      There should be continuity.      		 An open in the UART wire
      A2
      .
      A10      		 WHT
      .
      YEL      		 Under all conditions Connect terminals A8 and A2, and terminals A10 and A5:
      The seat should slide backward.
      • Faulty slide motor
      • An open or high resistance in the wire
      Connect terminals A8 and A10, and terminals A2 and A5:
      The seat should slide forward.
      A18
      .
      A16      		 GRY
      .
      RED      		 Under all conditions Connect terminals A8 and A18, and terminals A16 and A5:
      The seat should recline forward.
      • Faulty recline motor
      • An open or high resistance in the wire
      Connect terminals A8 and A16, and terminals A18 and A5:
      The seat should recline backward.
      A3
      .
      A11      		 YEL
      .
      ORN      		 Under all conditions Connect terminals A8 and A3, and terminals A11 and A5:
      The front of seat should move down.
      • Faulty front up-down motor
      • An open or high resistance in the wire
      Connect terminals A8 and A11, and terminals A3 and A5:
      The front of seat should move up.
      A7
      .
      A17      		 GRN
      .
      WHT      		 Under all conditions Connect terminals A8 and A7, and terminals A17 and A5:
      The rear of seat should move up.
      • Faulty rear up-down motor
      • An open or high resistance in the wire
      Connect terminals A8 and A17, and terminals A7 and A5:
      The rear of seat should move down.
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