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DTC 1501, 2703: Aircon System Error; Aircon Diag.

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.
NOTE:
  • Check the vehicle battery condition first.
  • Check any official Honda service website for more service information about the navigation system.
  • Check for B-CAN DTCs and resolve them before troubleshooting.
  • Before you troubleshoot, make sure to follow GENERAL TROUBLESHOOTING INFORMATION  .
  • When the ignition switch is in ACCESSORY (I), the A/C unit is turned off. The navigation loses communication with the A/C unit and stores DTC 1501 and/or 2703. Therefore, there is a possibility that the system is normal even though DTC 1501 and/or 2703 is stored. Check system links (see SYSTEM DIAGNOSTIC MODE  ) with the engine running, and if it appears OK, the system is OK at this time. If it is NG, do the following troubleshooting.
  1. Clear the hard error code (see HOW TO CLEAR ERROR HISTORY  ).
  2. Turn the ignition switch to LOCK (0), then back to ON (II).
  3. Go into the Diagnostic Menu, and select the Self-Diagnosis Mode in the Select Diagnosis Items menu (see SYSTEM DIAGNOSTIC MODE  ).
  4. Check the System Links.

    Is the Aircon icon red? 

    YES  - Go to step  5.

    NO  - Intermittent failure, the system is OK at this time. ■

  5. Turn the ignition switch to LOCK (0).
  6. Disconnect navigation unit connector B (32P).
  7. Connect navigation unit connector B (32P) terminals No. 4, No. 20, and No. 21 to body ground with a jumper wire.
    Fig 1: Connecting Navigation Unit Connector B (32P) Terminals No. 4, No. 20 & No. 21 To Body Ground With Jumper Wire
    G05967151Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Turn the ignition switch to ON (II).
  9. Press and hold the AUTO button, then press and hold the OFF button.

    Are both HEAT/VENT indicators solid with the remaining icons blinking? 

    YES  - Replace the navigation unit (see NAVIGATION UNIT REMOVAL/INSTALLATION  ). ■

    NO  - Go to step  10.

  10. Turn the ignition switch to LOCK (0), then disconnect the jumper wire.
  11. Disconnect climate control unit connector B (20P).
  12. Connect the climate control unit connector B (20P) terminals No. 2, No. 9 and No. 10 with a jumper wire.
    Fig 2: Connecting Climate Control Unit Connector B (20P) Terminals No. 2, No. 9 & No. 10 With Jumper Wire
    G05967152Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Check for continuity between navigation unit connector B (32P) terminals No. 4, No. 20, and No. 21 body ground individually.

    Is there continuity? 

    YES  - Go to step  14.

    NO  - Repair open in the wire(s) between the navigation unit and the climate control unit. ■

    Fig 3: Checking Continuity Between Navigation Unit Connector B (32P) Terminals No. 4, No. 20 & No. 21 Body Ground
    G05967153Courtesy of AMERICAN HONDA MOTOR CO., INC.
  14. Disconnect the jumper wire.
  15. Check for continuity between body ground and navigation unit connector B (32P) terminals No. 4, No. 20, and No. 21 individually.

    Is there continuity? 

    YES  - Repair short to body ground in the wire(s) between the navigation unit and the climate control unit. ■

    NO  - Go to step  16.

    Fig 4: Checking Continuity Between Body Ground & Navigation Unit Connector B (32P) Terminals No. 4, No. 20 & No. 21
    G05967154Courtesy of AMERICAN HONDA MOTOR CO., INC.
  16. Turn the ignition switch to ON (II).
  17. Measure the voltage between body ground and navigation unit connector B (32P) terminals No. 4, No. 20, and No. 21 individually.

    Is there 0.2 V or more? 

    YES  - Repair short to power in the wire(s) between the navigation unit and the climate control unit. ■

    NO  - Go to step  18.

    Fig 5: Checking Voltage Between Body Ground & Navigation Unit Connector B (32P) Terminals No. 4, No. 20 & No. 21
    G05967155Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Turn the ignition switch to LOCK (0).
  19. Check for continuity between the terminals of navigation unit connector B (32P) according to the table below.
    TERMINAL REFERENCE TABLE

    From Terminal To Terminals
    B4 (LT BLU) B20 (ORN), B21 (BLU)
    B20 (ORN) B21 (BLU)

    Is there continuity? 

    YES  - Repair short in the wire(s) between the navigation unit and the climate control unit. ■

    NO  - Replace the climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION ). ■

    Fig 6: Checking Continuity Between Terminals Of Navigation Unit Connector B (32P)
    G05967156Courtesy of AMERICAN HONDA MOTOR CO., INC.
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