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Cruise Control Communication Circuit Troubleshooting

A/T 

  1. Start the engine.
  2. Turn on the cruise control main switch, then drive the vehicle at speeds over 25 mph (40 km/h) with the cruise control.

    Does the cruise control operate? 

    1. YES  - Go to step 3.
    2. NO  - Check the cruise control unit (see Cruise Control Unit Input Test  ) or cruise control actuator.
  3. Turn the ignition switch OFF.
  4. Disconnect powertrain control module (PCM) connector D (17P) and cruise control unit 14P connector.
  5. Check for continuity between PCM connector terminal D12 and body ground.
    Fig 1: Checking For Continuity Between PCM Connector Terminal D12 & Body Ground
    G01461268Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair a short to ground in the wire between PCM connector terminal D12 and the cruise control unit 14P connector terminal No.8.
    2. NO  - Go to step 6.
  6. Reconnect PCM connector D (17P) and the cruise control unit 14P connector.
  7. Connect a voltmeter between cruise control unit 14P connector terminal No. 8 and body ground. Test-drive the vehicle at speeds over 25 mph (40 km/h) with the cruise control set, and watch the voltmeter.
    Fig 2: Connecting A Voltmeter Between Cruise Control Unit 14-Pin Connector Terminal No. 8 & Body Ground
    G01461269Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 1 V? 

    1. YES  - Go to step 8.
    2. NO  - Substitute a known-good cruise control unit. If the system works properly, replace the cruise control unit.
  8. Connect a voltmeter between PCM connector terminal D12 and body ground. Drive the vehicle at speeds over 25 mph (40 km/h) with the cruise control set, and watch the voltmeter.
    Fig 3: Connecting A Voltmeter Between PCM Connector Terminal D12 & Body Ground
    G01461270Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there about 1 V? 

    1. YES  - Check for loose connectors of the BLU/ORN wire between the cruise control unit and PCM. If necessary, replace the PCM and recheck (see HOW TO RESET THE ECM/PCM ).
    2. NO  - Repair an open in the wire between PCM connector terminal D12 and the control unit 14P connector terminal No. 8.
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