Power Seat Control Unit Input Test
  1. Turn the ignition switch to LOCK (0).
  1. Remove the driver's seat.
    NOTE: Be careful not to scratch the interior trim.
  1. Disconnect the 40P connector (A) and 18P connector (B) from the power seat control unit (C).
  1. 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 .
  1. With the connectors still disconnected, make these input tests at the 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 .
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if desired result is not obtained
    A34
    BLK/YEL
    Ignition switch ON (II)
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 2 (7.5 A) fuse in the driver's under-dash fuse/relay box
    • An open in the wire
    A36
    BLU
    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 in the wire
    B1
    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. 21 (20 A) fuse in the driver's under-dash fuse/relay box
    • An open in the wire
    B8
    PUR
    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. 19 (20 A) fuse in the driver's under-dash fuse/relay box
    • An open in the wire
    A9
    BLK/GRN
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G701)
    • An open in the wire
    B4
    BLK/YEL
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G701)
    • An open in the wire
    B18
    BLK/WHT
    A39
    BLK
    Under all conditions (disconnect the power window master switch 37P connector)
    Check for continuity between the A39 terminal and power window master switch 37P connector No. 33 terminal: There should be continuity.
    An open in the wire
    Under all conditions (disconnect the immobilizer-keyless control unit 7P connector)
    Check for continuity between the A39 terminal and immobilizer-keyless control unit 7P connector No. 3 terminal: There should be continuity.
    An open in the wire
    A40
    YEL
    Under all conditions (disconnect the power window master switch 37P connector)
    Check for continuity between the A40 terminal and power window master switch 37P connector No. 35 terminal: There should be continuity.
    An open in the wire
    Under all conditions (disconnect the immobilizer-keyless control unit 7P connector)
    Check for continuity between the A40 terminal and immobilizer-keyless control unit 7P connector No. 4 terminal: There should be continuity.
    An open in the wire
    A1·A7
    BRN/BLK·RED/WHT
    Slide switch in FORWARD position
    Check for continuity between the terminals: There should be continuity.
    • Faulty power seat adjustment switch
    • An open in the wire
    A1·A24
    BRN/BLK·ORN
    Slide switch in BACKWARD position
    Check for continuity between the terminals: There should be continuity.
    • Faulty power seat adjustment switch
    • An open in the wire
    A1·A6
    BRN/BLK·PNK
    Recline switch in FORWARD position
    Check for continuity between the terminals: There should be continuity.
    • Faulty power seat adjustment switch
    • An open in the wire
    A1·A23
    BRN/BLK·PUR
    Recline switch in BACKWARD position
    Check for continuity between the terminals: There should be continuity.
    • Faulty power seat adjustment switch
    • An open in the wire
    A1·A5
    BRN/BLK·LT GRN
    Front up-down switch in UP position
    Check for continuity between the terminals: There should be continuity.
    • Faulty power seat adjustment switch
    • An open in the wire
    A1·A4
    BRN/BLK·RED/BLK
    Front up-down switch in DOWN position
    Check for continuity between the terminals: There should be continuity.
    • Faulty power seat adjustment switch
    • An open in the wire
    A1·A22
    BRN/BLK·GRN/ORN
    Rear up-down switch in UP position
    Check for continuity between the terminals: There should be continuity.
    • Faulty power seat adjustment switch
    • An open in the wire
    A1·A3
    BRN/BLK·GRY
    Rear up-down switch in DOWN position
    Check for continuity between the terminals: There should be continuity.
    • Faulty power seat adjustment switch
    • An open in the wire
    B7·B17
    LT GRN·YEL
    Under all conditions
    Connect B1 and B7 terminals, and B17 and B4 terminals: The seat should slide backward.
    • Faulty slide motor
    • An open in the wire
    Connect B1 and B7 terminals, and B7 and B4 terminals: The seat should slide forward.
    B9·B11
    RED·GRY
    Under all conditions
    Connect B1 and B9 terminals, and B11 and B4 terminals: The seat should recline forward.
    • Faulty recline motor
    • An open in the wire
    Connect B1 and B11 terminals, and B9 and B4 terminals: The seat should recline backward.
    B6·B16
    BRN/WHT·ORN
    Under all conditions
    Connect B1 and B6 terminals, and B16 and B4 terminals: The front of seat should move down.
    • Faulty front up-down motor
    • An open in the wire
    Connect B1 and B16 terminals, and B6 and B4 terminals: The front of seat should move up.
    B2·B10
    ORN·BLU
    Under all conditions
    Connect B1 and B2 terminals, and B10 and B4 terminals: The rear of seat should move up.
    • Faulty rear up-down motor
    • An open in the wire
    Connect B1 and B10 terminals, and B2 and B4 terminals: The rear of seat should move down.


  1. Reconnect the connectors to the power seat control unit, and make these input tests at the 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
    A26 (A/T)
    BLU/BLK
    Shift lever in P position
    Measure the voltage to ground: There should be less than 1 V.
    • Poor ground (G101)
    • Faulty transmission range switch
    • An open in the wire
    Shift lever in any other position than P
    Measure the voltage to ground: There should be 5 V or more.
    • Faulty transmission range switch
    • A short to ground in the wire
    A15
    WHT/BLK
    Ignition switch ON (II)
    Measure the voltage to ground: There should be about 5 V.
    • Faulty position sensor
    • A short to ground in the wire
    A10·A29
    BLU/WHT·GRN/BLK
    Run the recline motor
    Measure the voltage between the A10 (+) and A29 (−) terminals: There should be about 2.5 V average.
    • Faulty position sensor
    • An open in the wire
    • A short to ground in the wire
    A11·A29
    YEL/BLK·GRN/BLK
    Run the slide motor
    Measure the voltage between the A11 (+) and A29 (−) terminals: There should be about 2.5 V average.
    • Faulty position sensor
    • An open in the wire
    • A short to ground in the wire
    A12·A29
    BLU/BLK·GRN/BLK
    Run the front up-down motor
    Measure the voltage between the A12 (+) and A29 (−) terminals: There should be about 2.5 V average.
    • Faulty position sensor
    • An open in the wire
    • A short to ground in the wire
    A13·A29
    GRN/WHT·GRN/BLK
    Run the rear up-down motor
    Measure the voltage between the A13 (+) and A29 (−) terminals: There should be about 2.5 V average.
    • Faulty position sensor
    • An open in the wire
    • A short to ground in the wire