2012 Honda Odyssey EXFACTORY OEM SERVICE PROCEDURE

Power Mirror Control Unit Input Test/Replacement

NOTE: Before testing, 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
    G06970198Courtesy 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. 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 step 6.
    TEST CONDITION CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    2 GRN Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
    • Blown No. C11 (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. B16 (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
    .
    PNK    		 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. C26 (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    		 LT BLU
    .
    GRY    		 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. C26 (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 RED 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. C26 (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    		 PNK
    .
    LT GRN    		 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    		 PUR
    .
    LT GRN    		 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    		 BLU
    .
    LT GRN    		 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
    .
    LT GRN    		 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).
  7. 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 power mirror control unit must be faulty; replace it.
    TEST CONDITION CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    24 GRY Disconnect power seat control unit B (40P) connector Check for continuity between terminal No. 24 (GRY) and power seat control unit B (40P) connector terminal No. 23 (GRY): There should be continuity. An open in the UART wire
    23
    .
    22    		 RED
    .
    LT GRN    		 Under all conditions Connect terminals No. 23 and No. 13, and terminals No. 22 and No. 15 with jumper wires: 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 with jumper wires: The left mirror should move down.
    21
    .
    22    		 BLU
    .
    LT GRN    		 Under all conditions Connect terminals No. 22 and No. 13, and terminals No. 21 and No. 15 with jumper wires: 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 with jumper wires: The left mirror should swing right.
    10
    .
    20    		 BRN
    .
    WHT    		 Under all conditions Connect terminals No. 10 and No. 13, and terminals No. 20 and No. 15 with jumper wires: 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 with jumper wires: The right mirror should move down.
    19
    .
    20    		 RED
    .
    WHT    		 Under all conditions Connect terminals No. 20 and No. 13, and terminals No. 19 and No. 15 with jumper wires: 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 with jumper wires: The right mirror should swing right.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.