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Power Seat Control Unit Input Test/Replacement

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • SRS components are located in this area. Review the SRS component locations, and precautions and procedures before doing repairs or servicing
  • Before testing, troubleshoot the multiplex integrated control unit 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 & 18P Connector
    G05966698Courtesy 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 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, go to step  6.
    WIRE CONDITION TABLE

    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 or high resistance in the 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 these input tests.
WIRE CONDITION TABLE

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 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 more than 5 V.
  • Faulty transmission range switch
  • A short to ground in the wire
  • Faulty power seat control unit
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