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Power Seat Control Unit Input Test/Replacement

NOTE:
  1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  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 Power Seat Control Unit 18P, 40P Connectors Terminals
    G08077117Courtesy 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 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.
    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    B34 BRN Ignition switch ON (II), or power mode ON Measure the voltage to ground: There should be battery voltage.
    • Blown No. 12 (7.5 A) fuse in the driver's 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. 15 (10 A) fuse in the under-hood fuse/relay box
    • An open or high resistance in the wire
    A1 RED Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 3-4 (DR F/B STD) (60 A) fuse in the under-hood fuse/relay box
    • Blown No. 21 (20 A) fuse in the driver's under-dash fuse/relay box
    • An open or high resistance in the wire
    A8 LT BLU Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 3-4 (DR F/B STD) (60 A) fuse in the under-hood fuse/relay box
    • Blown No. 19 (20 A) fuse in the driver's under-dash fuse/relay box
    • An open or high resistance in the wire
    B9 BLK In all ignition switch positions or all power modes Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G602)
    • An open or high resistance in the ground wire
    A4 BRN In all ignition switch positions or all power modes Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G602)
    • An open or high resistance in the ground wire
    A18 BRN In all ignition switch positions or all power modes Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G602)
    • An open or high resistance in the ground wire
    B26 GRN 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 position other than P Measure the voltage to ground: There should be about 5 V.
    • Faulty transmission range switch
    • A short to ground in the wire
    B15 BLU Ignition switch ON (II), or power mode ON Measure the voltage to ground: There should be at least about 10 V.
    • Faulty power seat control unit
    • Faulty position sensor
    • A short to ground in the wire
    B10
    •
    B29    		 GRN
    •
    ORN    		 Run the recline motor Measure the voltage between terminals B10 (+) and B29 (-): 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
    B11
    •
    B29    		 WHT
    •
    ORN    		 Run the slide motor Measure the voltage between terminals B11 (+) and B29 (-): 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
    B12
    •
    B29    		 RED
    •
    ORN    		 Run the front up-down motor Measure the voltage between terminals B12 (+) and B29 (-): 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
    B13
    •
    B29    		 YEL
    •
    ORN    		 Run the rear up-down motor Measure the voltage between terminals B13 (+) and B29 (-): 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
    B1
    •
    B7    		 BLU
    •
    GRY    		 Slide switch to the 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
    B1
    •
    B24    		 BLU
    •
    LT GRN    		 Slide switch to the 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
    B1
    •
    B6    		 BLU
    •
    LT BLU    		 Recline switch to the 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
    B1
    •
    B23    		 BLU
    •
    GRN    		 Recline switch to the 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
    B1
    •
    B5    		 BLU
    •
    ORN    		 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
    B1
    •
    B4    		 BLU
    •
    RED    		 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
    B1
    •
    B22    		 BLU
    •
    PNK    		 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
    B1
    •
    B3    		 BLU
    •
    WHT    		 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), or press the engine start/stop button to select the OFF mode.
  7. Disconnect the connectors from the power seat control unit, and do these input tests at the following 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.
Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
B38 PUR Disconnect the power mirror control unit 24P connector and power tilt/telescopic steering control unit connector A (16P) 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
Check for continuity between terminal B38 and power tilt/telescopic steering control unit connector A (16P) terminal No. 11: There should be continuity. An open in the UART wire
Check for continuity to ground: There should be no continuity. A short to ground in the UART wire
A7
•
A17		 GRY
•
ORN		 Under all conditions Connect terminals A8 and A7, and terminals A17 and A18: The seat should slide backward.
  • Faulty slide motor
  • An open or high resistance in the wire
Connect terminals A8 and A17, and terminals A7 and A18: The seat should slide forward.
A9
•
A11		 YEL
LT GRN		 Under all conditions Connect terminals A1 and A9, and terminals A11 and A4: The seat should recline forward.
  • Faulty recline motor
  • An open or high resistance in the wire
Connect terminals A1 and A11, and terminals A9 and A4: The seat should recline backward.
A6
•
A16		 WHT
•
PUR		 Under all conditions Connect terminals A8 and A6, and terminals A16 and A18: The front of seat should move down.
  • Faulty front up-down motor
  • An open or high resistance in the wire
Connect terminals A8 and A16, and terminals A6 and A18: The front of seat should move up.
A2
•
A10		 GRN
•
PNK		 Under all conditions Connect terminals A1 and A2, and terminals A10 and A4: 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, and terminals A2 and A4: The rear of seat should move down.
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