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Reverse Lock System Circuit Troubleshooting

  1. Check whether the DTC P1705 or P1706 (2002-2004 models), P0705, P0706, and P0812 (2005-2006 models) is indicated.

    Does the scan tool or the HDS indicate code 2002-2004 models: P1705 or P1706,2005-2006 models: P0705, P0706, and P0812? 

    1. YES -  Perform the troubleshooting for the indicated code(s).
    2. NO -  Go to step 2.
  2. Turn the ignition switch OFF.
  3. Shift the shift lever to the P position while pushing the shift lock release.
  4. Turn the ignition switch ON (II).
  5. Press the brake pedal and release the accelerator pedal, shift the shift lever out of the P position, and check that the shift lock solenoid operates.

    Does the shift lever move out of the P position? 

    1. YES -  Go to step 6.
    2. NO -  Perform the Shift Lock System Circuit Troubleshooting:
  6. Shift to the N position.
  7. Turn the ignition switch to the ACC (I) position.
  8. Check that the shift lever shifts into the R position.

    Does the shift lever shift into the R position? 

    1. YES -  Check for loose terminal fit in the PCM and multiplex control unit connectors. If necessary, substitute a known-good PCM and multiplex control unit, and recheck.
    2. NO -  Go to step 9.
  9. Turn the ignition switch OFF.
  10. Remove the shift lock relay, and check for continuity between these terminals:
    • No. 3 and No. 5
    • No. 1 and No. 4
    • No. 1 and No. 2 while connecting battery voltage to terminals No. 3 and No. 5, and also check for no continuity between terminals No. 1 and No. 4.
      Fig 1: Removing Shift Lock Relay
      G03651990Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the shift lock relay test OK? 

    1. YES -  Go to step 11.
    2. NO -  Replace the shift lock relay.
  11. Turn the ignition switch to the ACC (I) position.
  12. Measure the voltage between the shift lock relay connector terminal No. 1 and body ground.
    Fig 2: Measuring Voltage Between Shift Lock Relay Connector Terminal And Body Ground
    G03651991Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there voltage? 

    1. YES -  Go to step 13.
    2. NO -  Check for blown No. 8 fuse in the underdash fuse/relay box. If the fuse is OK, repair open in the wire between the shift lock relay connector terminal No. 1 and the shift lock solenoid connector.
  13. Turn the ignition switch ON (II).
  14. Measure the voltage between the shift lock relay connector terminal No. 3 and body ground.
    Fig 3: Measuring Voltage Between Shift Lock Relay Connector Terminal And Body Ground
    G03651992Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Go to step 15.
    2. NO -  Check for blown No. 10 (7.5 A) fuse in the underdash fuse/relay box. If the fuse is OK, repair open in the wire between the shift lock relay connector terminal No. 3 and the underdash fuse/relay box.
  15. Measure the voltage between the shift lock relay connector terminal No. 3 and No. 5.
    Fig 4: Measuring Voltage Between Shift Lock Relay Connector Terminal
    G03651993Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES -  Repair open in the wire between the shift lock relay connector terminal No. 4 and the transmission range switch.
    2. NO -  Repair open in the wire between the shift lock relay connector terminal No. 5 and ground (G402), or repair poor ground (G402).
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