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Control Unit Input Test/Replacement

NOTE: Before testing the power tailgate control unit, troubleshoot the multiplex integrated control system 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), or press the engine start/stop button to select the OFF mode.
  2. Remove the left rear side trim panel (see TRIM REMOVAL/INSTALLATION - REAR SIDE AREA ).
  3. Disconnect power tailgate control unit connectors A (5P), B (20P), and C (14P) in the order shown in illustration.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Power Tailgate Control Unit A (5P), B (20P) And C (14P) Connectors Terminals
    G08087035Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Inspect all 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 all connectors to the power tailgate control unit, and do the following input tests:
    • If the test indicates a problem, find and correct the cause, then recheck the system.
    • If the input test proves OK, the control unit must be faulty; replace it.
    NOTE: After replacing the power tailgate control unit, reset the power tailgate control unit (see RESETTING THE POWER TAILGATE CONTROL UNIT  ).
    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A2 BRN Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 6 (40 A) fuse in the auxiliary under-hood fuse/relay box
    • An open or high resistance in the wire
    B12 RED Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 15 (20 A) fuse in the auxiliary under-hood fuse/relay box
    • An open or high resistance in the wire
    B11 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
    • Faulty driver's under-dash fuse/relay box
    • An open or high resistance in the wire
    C14 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
    A1 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G603)
    • An open or high resistance in the ground wire
    A4 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G603)
    • An open or high resistance in the ground wire
    B19 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G603)
    • An open or high resistance in the ground wire
    B8 LT BLU 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
    C13 WHT Ignition switch ON (II), or power mode ON Measure the voltage to ground: There should be about 5 V.
    • Faulty power tailgate sensor
    • A short to ground in the wire
    B14 ORN Ignition switch ON (II), or power mode ON, and while the tailgate is opened or closed manually Measure the voltage between terminals B14 and B19: An analog meter should alternate between 0 V and about 5 V (a digital voltmeter should read about 2.5 V while the tailgate moves).
    • Faulty power tailgate sensor
    • An open or high resistance in the wire
    • A short to ground in the wire
    B15 YEL Ignition switch ON (II), or power mode ON, and while the tailgate is opened or closed manually Measure the voltage between terminals B15 and B19: An analog meter should alternate between 0 V and about 5 V (a digital voltmeter should read about 2.5 V while the tailgate moves).
    • Faulty power tailgate sensor
    • An open or high resistance in the wire
    • A short to ground in the wire
    B18 LT GRN Under all conditions, disconnect the power tailgate control unit connector B (20P) Check for continuity to ground: There should be no continuity.
    • Poor ground (G901) or an open in the ground wire
    • An open or high resistance in the wire
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