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Power Seat Control Unit Input Test/Replacement

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 40P connector (A) and 18P connector (B) from the power seat control unit (C).
    Fig 1: Identifying Power Seat Control Unit, 40P Connector And 18P Connector Terminals
    G08089427Courtesy 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 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.
    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    B38 GRY Disconnect the power mirror control unit 24P connector Check for continuity between terminal B38 and power mirror control unit 24P connector terminal No. 13:
    There should be continuity.    		 An open in the UART wire
    A7
    .
    A17    		 RED
    .
    GRN    		 Under all conditions Connect terminals A1 and A7, terminals A4 and A17:
    The seat should slide backward.
    • Faulty slide motor
    • An open or high resistance in the wire
    Connect terminals A1 and A17, terminals A4 and A7:
    The seat should slide forward.
    A9
    .
    A11    		 WHT
    .
    GRN    		 Under all conditions Connect terminals A1 and A9, terminals A4 and A11:
    The seat should recline forward.
    • Faulty recline motor
    • An open or high resistance in the wire
    Connect terminals A1 and A11, terminals A4 and A9:
    The seat should recline backward.
    A6
    .
    A16    		 PUR
    .
    BLU    		 Under all conditions Connect terminals A1 and A6, terminals A4 and A16:
    The front of seat should move down.
    • Faulty front up-down motor
    • An open or high resistance in the wire
    Connect terminals A1 and A16, terminals A4 and A6:
    The front of seat should move up.
    A2
    .
    A10    		 YEL
    .
    PNK    		 Under all conditions Connect terminals A1 and A2, terminals A4 and A10:
    The rear of seat should move up.
    • Faulty rear up-down motor
    • An open or high resistance in the wire
    Connect terminals A1 and A10, terminals A4 and A2:
    The rear of seat should move down.
  6. 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, the control unit must be faulty; replace it.
    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A4 BLK In all ignition switch positions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G503)
    • An open or high resistance in the ground wire
    A18
    B9
    A1 BLU Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 9 (20 A) fuse in the auxiliary under-hood fuse/relay box
    • An open or high resistance in the wire
    A8 ORN Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 10 (20 A) fuse in the auxiliary under-hood fuse/relay box
    • An open or high resistance in the wire
    B34 YEL Ignition switch ON (II) Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 10 (7.5 A) fuse in the under-dash fuse/relay box
    • An open or high resistance in the wire
    B36 WHT Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 23 (10 A) fuse in the under-hood fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open or high resistance in the wire
    B1
    .
    B7    		 GRN
    .
    LT GRN    		 Slide switch in FORWARD position Measure the voltage between the terminals:
    There should be less than 0.2 V.
    • Faulty driver's power seat adjustment switch
    • An open or high resistance in the wire
    B1
    .
    B24    		 GRN
    .
    PUR    		 Slide switch in BACKWARD position Measure the voltage between the terminals:
    There should be less than 0.2 V.
    • Faulty driver's power seat adjustment switch
    • An open or high resistance in the wire
    B1
    .
    B6    		 GRN
    .
    LT BLU    		 Recline switch in FORWARD position Measure the voltage between the terminals:
    There should be less than 0.2 V.
    • Faulty driver's power seat adjustment switch
    • An open or high resistance in the wire
    B1
    .
    B23    		 GRN
    .
    WHT    		 Recline switch in BACKWARD position Measure the voltage between the terminals:
    There should be less than 0.2 V.
    • Faulty driver's power seat adjustment switch
    • An open or high resistance in the wire
    B1
    .
    B5    		 GRN
    .
    BLU    		 Front up-down switch in UP position Measure the voltage between the terminals:
    There should be less than 0.2 V.
    • Faulty driver's power seat adjustment switch
    • An open or high resistance in the wire
    B1
    .
    B4    		 GRN
    .
    RED    		 Front up-down switch in DOWN position Measure the voltage between the terminals:
    There should be less than 0.2 V.
    • Faulty driver's power seat adjustment switch
    • An open or high resistance in the wire
    B1
    .
    B22    		 GRN
    .
    PNK    		 Rear up-down switch in UP position Measure the voltage between the terminals:
    There should be less than 0.2 V.
    • Faulty driver's power seat adjustment switch
    • An open or high resistance in the wire
    B1
    .
    B3    		 GRN
    .
    GRY    		 Rear up-down switch in DOWN position Measure the voltage between the terminals:
    There should be less than 0.2 V.
    • Faulty driver's power seat adjustment switch
    • An open or high resistance in the wire
    B15 YEL Run the power seat motors Measure the voltage between to ground:
    There should be about 10 V or more.
    • Faulty position sensor
    • A short to ground in the wire
    • Faulty power seat control unit
    B10
    .
    B29    		 PNK
    .
    ORN    		 Run the recline motor Measure the voltage between terminals B10 and B29:
    There should be about 2.5 V average.
    • Faulty recline position sensor
    • An open or high resistance in the wire
    • A short to ground in the wire
    • Faulty power seat control unit
    B11
    .
    B29    		 GRY
    .
    ORN    		 Run the slide motor Measure the voltage between terminals B11 and B29:
    There should be about 2.5 V average.
    • Faulty slide position sensor
    • An open or high resistance in the wire
    • A short to ground in the wire
    • Faulty power seat control unit
    B12
    .
    B29    		 WHT
    .
    ORN    		 Run the front up-down motor Measure the voltage between terminals B12 and B29:
    There should be about 2.5 V average.
    • Faulty front up-down position sensor
    • An open or high resistance in the wire
    • A short to ground in the wire
    • Faulty power seat control unit
    B13
    .
    B29    		 BLU
    .
    ORN    		 Run the rear up-down motor Measure the voltage between terminals B13 and B29:
    There should be about 2.5 V average.
    • Faulty rear up-down position sensor
    • An open or high resistance in the wire
    • A short to ground in the wire
    • Faulty power seat control unit
    B26 PNK Transmission range switch in P position Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G101) or an open in the ground wire
    • Faulty or improperly adjusted transmission range switch
    • An open or high resistance in the wire
    Transmission range switch in any other position than P Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty transmission range switch
    • A short to ground in the wire
    • Faulty power seat control unit
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