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Control Unit Input Test

NOTE: Before testing, check the No. 22 (AS F/B) (70 A) fuse in the under-hood fuse/relay box, the No. 30 (7.5 A) fuse in the driver's under-dash fuse/relay box, and the No. 6 (20 A) fuse in the passenger's under-dash fuse/relay box.
  1. Remove the driver's or front passenger's seat (see FRONT SEAT REMOVAL/INSTALLATION ).
  2. Disconnect the 26P connector (A) from the seat ventilation control unit (B).
    Fig 1: Identifying 26P Connector And Seat Ventilation Control Unit
    G06162949Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. 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 4.
  4. Reconnect the 26P connector to the control unit, and do these input tests at the connector.
    • 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 5.
    WIRE TEST CONDITION REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    12 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V.
    • Poor ground (G601) [G651]
    • An open in the wire
    13 BLK Under all conditions Measure the voltage to ground: There should be less than 0.1 V.
    • Poor ground (G601) [G651]
    • An open in the wire
    1 BLK/YEL [RED] Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
    • Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    • An open in the wire
    [] : Front passenger's seat
  5. Disconnect the 26P connector from the control unit, and do these input tests at the connector.
    • 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.
    WIRE TEST CONDITION REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    3 BLK [GRN/YEL] Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
    • Blown No. 6 (20A) fuse in the passenger's under-dash fuse/relay box
    • Poor ground (G506)
    • Faulty seat heater relay
    • Faulty seat heater
    • Faulty passenger's under-dash fuse/relay box
    • An open in the wire
    4 BRN/BLK Under all conditions Check for continuity between terminals No. 4 and No. 5: There should be continuity.
    • Faulty seat heater
    • An open in the wire
    5 BRN
    6 PNK Ignition switch ON (II) Attach to ground: The seat cushion rear fan motor should run.
    • Poor ground (G506, G601, [G651])
    • Faulty seat heater relay
    • Faulty seat cushion rear fan motor
    • Faulty passenger's under-dash fuse/relay box
    • An open in the wire
    7 BLU Ignition switch ON (II) Attach to ground: The seat-back fan motors should run.
    • Poor ground (G506, G601, [G651])
    • Faulty seat heater relay
    • Faulty seat cushion rear fan motor
    • Faulty passenger's under-dash fuse/relay box
    • An open in the wire
    8 YEL Ignition switch ON (II) Attach to ground: The seat cushion front fan motor should run.
    • Poor ground (G506, G601, [G651])
    • Faulty seat heater relay
    • Faulty seat cushion rear fan motor
    • Faulty passenger's under-dash fuse/relay box
    • An open in the wire
    14 WHT/RED Ignition switch ON (II), seat ventilation switch UP side pushed Measure the voltage to ground: There should be battery voltage.
    • Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
    • Faulty seat ventilation switch
    • An open in the wire
    15 WHT/BLK Ignition switch ON (II), seat ventilation switch DOWN side pushed Measure the voltage to ground: There should be battery voltage.
    • Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
    • Faulty seat ventilation switch
    • An open in the wire
    17 RED/GRN Ignition switch ON (II) Attach to ground: The seat heater HIGH indicator should come on.
    • Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
    • Faulty seat ventilation switch
    • An open in the wire
    18 RED/YEL Ignition switch ON (II) Attach to ground: The seat heater MIDDLE indicator should come on.
    • Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
    • Faulty seat ventilation switch
    • An open in the wire
    19 RED/WHT Ignition switch ON (II) Attach to ground: The seat heater LOW indicator should come on.
    • Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
    • Faulty seat ventilation switch
    • An open in the wire
    20 BLU/GRN Ignition switch ON (II) Attach to ground: The seat fan HIGH indicator should come on.
    • Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
    • Faulty seat ventilation switch
    • An open in the wire
    21 BLU/YEL Ignition switch ON (II) Attach to ground: The seat fan MIDDLE indicator should come on.
    • Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
    • Faulty seat ventilation switch
    • An open in the wire
    22 BLU/WHT Ignition switch ON (II) Attach to ground: The seat fan LOW indicator should come on.
    • Blown No. 21 (10 A) fuse in the driver's under-dash fuse/relay box
    • Faulty seat ventilation switch
    • An open in the wire
    [] : Front passenger's seat
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