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Power Mirror Control Unit Input Test/Replacement

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 Honda Crosstour, 2014 Honda Crosstour, 2013 Honda Crosstour, 2012 Honda Crosstour, and 2011 Honda Accord Crosstour. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before troubleshooting the DPMS, 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).
  2. Remove the driver's door panel (see FRONT DOOR PANEL REMOVAL/INSTALLATION ).
  3. Disconnect the 24P connector (A) from the power mirror control unit (B).
    Fig 1: Identifying 24P Connector And Power Mirror Control Unit
    G06420559Courtesy of ABLE BODY CORP.
  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 next step.
  5. Reconnect the connector to the power mirror 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 next step.
      CONNECTOR INPUT TESTS REFERENCE

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      2 LT GRN Ignition switch ON (II) Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. B16 (7.5 A) fuse in the driver's under-dash fuse/relay box
      • An open or high resistance in the wire
      13 WHT Under all conditions Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. A15 (10 A) fuse in the under-hood fuse/relay box
      • An open or high resistance in the wire
      15 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G401)
      • An open or high resistance in the ground wire
      12
      .
      11      		 PUR
      .
      BRN      		 Ignition switch ON (II), and mirror select switch in LEFT, then mirror down switch pressed Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. B16 (7.5 A) fuse in the driver's under-dash fuse/relay box
      • Faulty power mirror switch
      • An open or high resistance in the wire
      5
      .
      4      		 RED
      .
      WHT      		 Ignition switch ON (II), and mirror select switch in RIGHT, then mirror down switch pressed Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. B16 (7.5 A) fuse in the driver's under-dash fuse/relay box
      • Faulty power mirror switch
      • An open or high resistance in the wire
      3 GRY Ignition switch ON (II), and mirror select switch in LEFT or RIGHT, then mirror up switch pressed Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. B16 (7.5 A) fuse in the driver's under-dash fuse/relay box
      • Faulty power mirror switch
      • An open or high resistance in the wire
      6 YEL Move left or right mirrors Measure the voltage to ground:
      There should be about 5 V.
      • Faulty mirror position sensor
      • A short to ground in the wire
      9
      .
      7      		 GRN
      .
      BRN      		 Swing the left mirror from full left to full right Measure the voltage between terminals No. 9 and No. 7:
      There should be about 0.5 V to 4.5 V (average about 2.5 V when the mirror moves).
      • Faulty left mirror position sensor
      • An open or high resistance in the wire
      • A short to ground in the wire
      8
      .
      7      		 LT GRN
      .
      BRN      		 Move the left mirror from full up to full down Measure the voltage between terminals No. 8 and No. 7:
      There should be about 0.5 V to 4.5 V (average about 2.5 V when the mirror moves).
      • Faulty left mirror position sensor
      • An open or high resistance in the wire
      • A short to ground in the wire
      17
      .
      7      		 PUR
      .
      BRN      		 Swing the right mirror from full left to full right Measure the voltage between terminals No. 17 and No. 7:
      There should be about 0.5 V to 4.5 V (average about 2.5 V when the mirror moves).
      • Faulty right mirror position sensor
      • An open or high resistance in the wire
      • A short to ground in the wire
      18
      .
      7      		 ORN
      .
      BRN      		 Move the right mirror from full up to full down Measure the voltage between terminals No. 18 and No. 7:
      There should be about 0.5 V to 4.5 V (average about 2.5 V when the mirror moves).
      • Faulty right mirror position sensor
      • An open or high resistance in the wire
      • A short to ground in the wire
  6. Turn the ignition switch to LOCK (0), then disconnect the connectors from the power mirror 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, the control unit must be faulty; replace it.
      CONNECTOR INPUT TESTS REFERENCE

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      24 LT GRN Disconnect power seat control unit B (40P) connector Check for continuity between terminal No. 24 (LT GRN) and power seat control unit B (40P) connector terminal No. 23 (BLK):
      There should be continuity.      		 An open in the UART wire
      23
      .
      22      		 PUR
      .
      ORN      		 Under all conditions Connect terminals No. 23 and No. 13, and terminals No. 22 and No. 15:
      The left mirror should move up.
      • Faulty left mirror actuator
      • An open or high resistance in the wire
      Connect terminals No. 22 and No. 13, and terminals No. 23 and No. 15:
      The left mirror should move down.
      21
      .
      22      		 LT BLU
      .
      ORN      		 Under all conditions Connect terminals No. 22 and No. 13, and terminals No. 21 and No. 15:
      The left mirror should swing left.
      • Faulty left mirror actuator
      • An open or high resistance in the wire
      Connect terminals No. 21 and No. 13, and terminals No. 22 and No. 15:
      The left mirror should swing right.
      10
      .
      20      		 YEL
      .
      RED      		 Under all conditions Connect terminals No. 10 and No. 13, and terminals No. 20 and No. 15:
      The right mirror should move up.
      • Faulty right mirror actuator
      • An open or high resistance in the wire
      Connect terminals No. 20 and No. 13, and terminals No. 10 and No. 15:
      The right mirror should move down.
      19
      .
      20      		 WHT
      .
      RED      		 Under all conditions Connect terminals No. 20 and No. 13, and terminals No. 19 and No. 15:
      The right mirror should swing left.
      • Faulty right mirror actuator
      • An open or high resistance in the wire
      Connect terminals No. 19 and No. 13, and terminals No. 20 and No. 15:
      The right mirror should swing right.
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