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Home >> Chrysler >> 2001 >> Sebring LX, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Cruise Control Systems - Coupe) >> Auto-Cruise Control System Diagnosis >> Diagnostic Trouble Code Procedures >> DTC 14 : Stoplight Switch System >> Diagnosis

DTC 14 : Stoplight Switch System: Diagnosis

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tool: 

  1. STEP 1. Measure the signal voltage at stoplight switch connector C-03 by backprobing. 
    1. Do not disconnect stoplight switch connector C-03.
    2. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
      Fig 1: Disconnecting Stoplight Switch Connector C-03
      G04539323Courtesy of DAIMLERCHRYSLER CORPORATION
    3. Measure the voltage between stoplight switch connector C-03 terminal 3 and ground by backprobing.
      • The voltage should measure battery positive voltage. (When brake pedal is depressed).
      • The voltage should measure 0 V. (When brake pedal is not depressed).
    4. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.

    Q: Are all of the measured voltages satisfied? 

    YES  : Go to  Step 3.

    NO:  Go to Step 2.

    Fig 2: Measuring Voltage Between Stoplight Switch Connector C-03 Terminal 3 And Ground
    G04539324Courtesy of DAIMLERCHRYSLER CORPORATION
  2. STEP 2. Check stoplight switch connector C-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connector and terminals in good condition? 

    YES  : Go to  Step 13.

    NO:  Repair or replace the faulty connector. (Refer to , HARNESS CONNECTOR INSPECTION ). Go to  Step 17.

    Fig 3: Checking Stoplight Switch Connector C-03
    G04539325Courtesy of DAIMLERCHRYSLER CORPORATION
  3. STEP 3. Measure the signal voltage at stoplight switch connector C-03 by backprobing. 
    1. Do not disconnect stoplight switch connector C-03.
    2. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
      Fig 4: Disconnecting Stoplight Switch Connector C-03
      G04539326Courtesy of DAIMLERCHRYSLER CORPORATION
    3. Measure the voltage between stoplight switch connector C-03 terminal 4 and ground by backprobing.
      • The voltage should measure battery positive voltage. (When brake pedal is depressed).
      • The voltage should measure 0 V. (When brake pedal is not depressed).
    4. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.

    Q: Are all of the measured voltages satisfied? 

    YES  : Go to  Step 6.

    NO:  Go to Step 4.

    Fig 5: Measuring Voltage Between Stoplight Switch Connector C-03 Terminal 4 And Ground
    G04539327Courtesy of DAIMLERCHRYSLER CORPORATION
  4. STEP 4. Check stoplight switch connector C-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connector and terminals in good condition? 

    YES  : Go to Step 5.

    NO:  Repair or replace the faulty connector. (Refer to , HARNESS CONNECTOR INSPECTION ). Go to  Step 17.

    Fig 6: Checking Stoplight Switch Connector C-03
    G04539328Courtesy of DAIMLERCHRYSLER CORPORATION
  5. STEP 5. Check the stoplight switch. 
    1. Disconnect stoplight switch connector C-03.
      Fig 7: Disconnecting Stoplight Switch Connector C-03
      G04539329Courtesy of DAIMLERCHRYSLER CORPORATION
    2. Connect an ohmmeter to the stoplight switch between terminals 3 and 4, and check whether there is continuity when the plunger of the stoplight switch is pushed in and an open circuit when it is released.
    3. The stoplight switch is in good condition if the circuit is open when the plunger is pushed in to a depth of within 4 mm (0.2 inch) from the outer case edge surface, and if there is continuity when it is released.

    Q: Is the stoplight switch in good condition? 

    YES  : It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). Go to  Step 17.

    NO:  Replace the stoplight switch. (Refer to BRAKE PEDAL ). Go to  Step 17.

    Fig 8: Connecting Ohmmeter To Stoplight Switch Between Terminals
    G04539330Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 9: Checking Stoplight Switch Continuity
    G04539331Courtesy of DAIMLERCHRYSLER CORPORATION
  6. STEP 6. Measure the signal voltage at auto-cruise control vacuum pump connector A-01 by backprobing. 
    1. Do not disconnect auto-cruise control vacuum pump connector A-01.
    2. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
      Fig 10: Disconnecting Auto-Cruise Control Vacuum Pump Connector A-01
      G04539332Courtesy of DAIMLERCHRYSLER CORPORATION
    3. Measure the voltage between terminal 1 and ground by backprobing.
      • The voltage should measure battery positive voltage. (When brake pedal is depressed).
      • The voltage should measure 0 V. (When brake pedal is not depressed).
    4. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.

    Q: Are all of the measured voltages satisfied? 

    YES  : Go to  Step 9.

    NO:  Go to Step 7.

    Fig 11: Measuring Voltage Between Terminal 1 And Ground
    G04539333Courtesy of DAIMLERCHRYSLER CORPORATION
  7. STEP 7. Check auto-cruise control vacuum pump connector A-01 and intermediate connector C-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connectors and terminals in good condition? 

    YES  : Go to Step 8.

    NO:  Repair or replace the faulty connector. (Refer to , HARNESS CONNECTOR INSPECTION ). Go to  Step 17.

    Fig 12: Checking Auto-Cruise Control Vacuum Pump Connector A-01
    G04539334Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 13: Checking Intermediate Connector C-05
    G04539335Courtesy of DAIMLERCHRYSLER CORPORATION
  8. STEP 8. Check the harness wire between stoplight switch connector C-03 terminal 4 and auto-cruise control vacuum pump connector A-01 terminal 1 for damage. 

    Q: Is the harness wire in good condition? 

    YES  : It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). Go to  Step 17.

    NO:  Repair the damaged harness wire. Go to  Step 17.

    Fig 14: Checking Harness Wire Between Stoplight Switch Connector C-03
    G04539336Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 15: Checking Auto-Cruise Control Vacuum Pump Connector A-01
    G04539337Courtesy of DAIMLERCHRYSLER CORPORATION
  9. STEP 9. Measure the signal voltage at auto-cruise control-ECU connector C-21 by backprobing. 
    1. Do not disconnect auto-cruise control-ECU connector C-21.
    2. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
      Fig 16: Disconnecting Auto-Cruise Control-ECU Connector C-21
      G04539338Courtesy of DAIMLERCHRYSLER CORPORATION
    3. Measure the voltage between auto-cruise control-ECU connector C-21 terminal 7 and ground by backprobing.
      • The voltage should measure greater than 10 V. (When canceling constant speed driving with the auto-cruise control CANCEL switch).
    4. Measure the voltage between auto-cruise control-ECU connector C-21 terminal 8 and ground by backprobing.
      • The voltage should measure greater than 10 V. (When decelerating with the auto-cruise control SET switch while driving at constant speed).
        Fig 17: Measuring Voltage Between Auto-Cruise Control-ECU Connector C-21 Terminal 8 And Ground
        G04539339Courtesy of DAIMLERCHRYSLER CORPORATION
    5. Measure the voltage between auto-cruise control-ECU connector C-21 terminal 16 and ground by backprobing.
      • The voltage should measure battery positive voltage. (When the motor is stopped during a constant road speed).
    6. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.

    Q: Are all of the measured voltages satisfied? 

    YES  : Check that DTC 14 is not set. If DTC 14 is not set, It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). If DTC 14 is set, replace the auto-cruise control-ECU (Refer to AUTO-CRUISE CONTROL  ), and then Go to  Step 17.

    NO:  Go to Step 10.

  10. STEP 10. Check auto-cruise control vacuum pump connector A-01, auto-cruise control-ECU connector C-21 and intermediate connector C-212 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connectors and terminals in good condition? 

    YES  : Go to Step 11.

    NO:  Repair or replace the faulty connector. (Refer to , HARNESS CONNECTOR INSPECTION ). Go to  Step 17.

    Fig 18: Checking Auto-Cruise Control Vacuum Pump Connector A-01
    G04539340Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 19: Checking Auto-Cruise Control-ECU Connector C-21
    G04539341Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 20: Checking Intermediate Connector C-212
    G04539342Courtesy of DAIMLERCHRYSLER CORPORATION
  11. STEP 11. Check the auto-cruise control vacuum pump. 
    1. Disconnect the vacuum hose from the auto-cruise control vacuum pump and connect a vacuum gauge to the vacuum pump.
    2. Disconnect auto-cruise control vacuum pump connector A-01.
      Fig 21: Disconnecting Auto-Cruise Control Vacuum Pump Connector A-01
      G04539343Courtesy of DAIMLERCHRYSLER CORPORATION
    3. Check the auto-cruise control vacuum pump and valves according to the following procedure:
      • Connect the positive battery terminal to auto-cruise control vacuum pump connector A-01 terminal 1, and the negative battery terminal to terminals 2, 3 and 4. The vacuum gauge should read greater than 27 kPa (8.0 in.Hg).
      • The vacuum should be maintained when terminal 4 is disconnected from the negative battery terminal while terminals 1, 2 and 3 remain connected. The vacuum gauge should read 0 kPa (0 in.Hg) when terminal 2 is disconnected from the negative battery terminal while terminals 1 and 3 remain connected.
      • The vacuum should be maintained when terminal 4 is disconnected from the negative battery terminal while terminals 1, 2 and 3 remain connected. The vacuum gauge should read 0 kPa (0 in.Hg) when terminal 3 is disconnected from the negative battery terminal while terminals 1 and 2 remain connected.
    4. Connect the auto-cruise control vacuum pump connector A-01.
      Fig 22: Checking Auto-Cruise Control Vacuum Pump And Valves
      G04539344Courtesy of DAIMLERCHRYSLER CORPORATION

    Q: Are all of the above values satisfied? 

    YES  : Go to Step 12.

    NO:  Replace the auto-cruise vacuum pump. (Refer to AUTO-CRUISE CONTROL  ). Go to  Step 17.

  12. STEP 12. Check the harness wire between auto-cruise control vacuum pump connector A-01 terminals 2, 3, 4 and auto-cruise control-ECU connector C-21 terminals 7, 8, 16 for damage. 

    Q: Is the harness wire in good condition? 

    YES  : Check that DTC 14 is not set. If DTC 14 is not set, It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). If DTC 14 is set, replace the auto-cruise control-ECU (Refer to AUTO-CRUISE CONTROL  ), and then Go to  Step 17.

    NO:  Repair the damaged harness wire. Go to  Step 17.

    Fig 23: Checking Harness Wire Between Auto-Cruise Control Vacuum Pump Connector A-01
    G04539345Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 24: Checking Auto-Cruise Control-ECU Connector C-21
    G04539346Courtesy of DAIMLERCHRYSLER CORPORATION
  13. STEP 13. Measure the signal voltage at auto-cruise control-ECU connector C-21 by backprobing. 
    1. Do not disconnect auto-cruise control-ECU connector C-21.
    2. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
      Fig 25: Disconnecting Auto-Cruise Control-ECU Connector C-21
      G04539347Courtesy of DAIMLERCHRYSLER CORPORATION
    3. Measure the voltage between auto-cruise control-ECU connector C-21 terminal 5 and ground by backprobing.
      • The voltage should measure battery positive voltage. (When brake pedal is depressed).
      • The voltage should measure 0 V. (When brake pedal is not depressed).
    4. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.
      Fig 26: Measuring Voltage Between Auto-Cruise Control-ECU Connector C-21 Terminal 5 And Ground
      G04539348Courtesy of DAIMLERCHRYSLER CORPORATION

    Q: Are all of the measured voltages satisfied? 

    YES  : Go to Step 14.

    NO:  Go to  Step 16.

  14. STEP 14. Check stoplight switch connector C-03 and intermediate connector C-209 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connectors and terminals in good condition? 

    YES  : Go to Step 15.

    NO:  Repair or replace the faulty connector. (Refer to , HARNESS CONNECTOR INSPECTION ). Go to  Step 17.

    Fig 27: Checking Stoplight Switch Connector C-03
    G04539349Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 28: Checking Intermediate Connector C-209
    G04539350Courtesy of DAIMLERCHRYSLER CORPORATION
  15. STEP 15. Check the harness wire between stoplight switch connector C-03 terminal 3 and auto-cruise control-ECU connector C-21 terminal 5 for damage. 

    Q: Are the harness wire in good condition? 

    YES  : It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). Go to  Step 17.

    NO:  Repair the damaged harness wire. Go to  Step 17.

    Fig 29: Checking Harness Wire Between Stoplight Switch Connector C-03
    G04539351Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 30: Checking Auto-Cruise Control-ECU Connector C-21
    G04539352Courtesy of DAIMLERCHRYSLER CORPORATION
  16. STEP 16. Check auto-cruise control-ECU connector C-21 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connector and terminals in good condition? 

    YES  : Check that DTC 14 is not set. If DTC 14 is not set, It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). If DTC 14 is set, replace the auto-cruise control-ECU (Refer to AUTO-CRUISE CONTROL  ), and then go to Step 17.

    NO:  Repair or replace the faulty connector. (Refer to , HARNESS CONNECTOR INSPECTION ). Go to Step 17.

  17. STEP 17. Check the diagnostic trouble codes. 

    Q: Is DTC 14 set? 

    YES  : Go to  Step 1.

    NO:  This procedure is complete.

    Fig 31: Checking Auto-Cruise Control-ECU Connector C-21
    G04539353Courtesy of DAIMLERCHRYSLER CORPORATION
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