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Power Mirror Control Unit Input Test/Replacement

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
  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 & Power Mirror Control Unit
    G05966699Courtesy 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. With the connector still disconnected, do these input tests at the following 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  6.
    WIRE CONDITION TABLE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    13 GRY Disconnect power seat control unit B (40P) connector Check for continuity between terminal No. 13 and power seat control unit B (40P) connector terminal No. 38:
    There should be continuity.    		 An open or high resistance in the UART wire
    14
    .
    15    		 GRN
    .
    BRN    		 Under all conditions Connect terminals No. 14 and No. 24, and terminals No. 15 and No. 22:
    The left mirror should move up.
    • Faulty left mirror actuator
    • An open or high resistance in the wire
    Connect terminals No. 15 and No. 24, and terminals No. 14 and No. 22:
    The left mirror should move down.
    15
    .
    16    		 BRN
    .
    WHT    		 Under all conditions Connect terminals No. 15 and No. 24, and terminals No. 16 and No. 22:
    The left mirror should swing left.
    • Faulty left mirror actuator
    • An open or high resistance in the wire
    Connect terminals No. 16 and No. 24, and terminals No. 15 and No. 22:
    The left mirror should swing right.
    3
    .
    17    		 LT BLU
    .
    ORN    		 Under all conditions Connect terminals No. 3 and No. 24, and terminals No. 17 and No. 22:
    The right mirror should move up.
    • Faulty right mirror actuator
    • An open or high resistance in the wire
    Connect terminals No. 17 and No. 24, and terminals No. 3 and No. 22:
    The right mirror should move down.
    17
    .
    18    		 ORN
    .
    GRY    		 Under all conditions Connect terminals No. 17 and No. 24, and terminals No. 18 and No. 22:
    The right mirror should swing right.
    • Faulty right mirror actuator
    • An open or high resistance in the wire
    Connect terminals No. 18 and No. 24, and terminals No. 17 and No. 22:
    The right mirror should swing left.
  6. Reconnect the connector to the power mirror control unit, and do these input tests at the following connector.
WIRE CONDITION TABLE

Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
22 BLK In all ignition switch positions Measure the voltage to ground:
There should be less than 0.2 V.
  • Poor ground (G4011)
  • An open or high resistance in the wire
11 YEL Ignition switch ON (II) Measure the voltage to ground:
There should be battery voltage.
  • Blown No. 10 (7.5 A) fuse in the under-dash fuse/relay box
  • Faulty under-dash fuse/relay box
  • An open or high resistance in the wire
24 WHT Under all conditions Measure the voltage to ground:
There should be battery voltage.
  • Blown No. 23 (10 A) fuse in the under-hood fuse/relay box
  • Faulty under-dash fuse/relay box
  • An open or high resistance in the wire
1
.
2		 RED
.
PUR		 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. 36 (10 A) fuse in the under-dash fuse/relay box
  • Faulty power mirror switch
  • An open or high resistance in the wire
8
.
9		 LT GRN
.
PNK		 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. 36 (10 A) fuse in the under-dash fuse/relay box
  • Faulty power mirror switch
  • An open or high resistance in the wire
10 GRN 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. 36 (10 A) fuse in the under-dash fuse/relay box
  • Faulty power mirror switch
  • An open or high resistance in the wire
4
.
6		 PNK
.
LT GRN		 Swing the left mirror from full left to full right Measure the voltage between terminals No. 4 and No. 6:
There should be about 0.5 V to 4.5 V (average about 2.5V when the mirror moves).
  • Faulty left mirror position sensor
  • An open or high resistance in the wire
  • A short to ground in the wire
5
.
6		 LT BLU
.
LT GRN		 Move the left mirror from full up to full down Measure the voltage between terminals No. 5 and No. 6:
There should be about 0.5 V to 4.5 V (average about 2.5V when the mirror moves).
  • Faulty left mirror position sensor
  • An open or high resistance in the wire
  • A short to ground in the wire
20
.
6		 BRN
.
LT GRN		 Swing the right mirror from full left to full right Measure the voltage between terminals No. 20 and No. 6:
There should be about 0.5 V to 4.5 V (average about 2.5V when the mirror moves).
  • Faulty right mirror position sensor
  • An open or high resistance in the wire
  • A short to ground in the wire
19
.
6		 GRN
.
LT GRN		 Move the right mirror from full up to full down Measure the voltage between terminals No. 19 and No. 6:
There should be about 0.5 V to 4.5 V (average about 2.5V when the mirror moves).
  • Faulty right mirror position sensor
  • An open or high resistance in the wire
  • A short to ground in the wire
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