DTC 15: Cruise Control Switch System: Diagnosis

Required Special Tools: 

• MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
• MB992745: V.C.I.-Lite main harness A
• MB992747: V.C.I.-Lite USB cable short
• MB992748: V.C.I.-Lite USB cable long
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicles Communication Interface (V.C.I.)
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

1. STEP 1. Check the data list. 
   CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).

   Using scan tool (M. U. T-III), check the data list (Refer to DATA LIST REFERENCE TABLE  ).

   • Item number 75: Cancel switch
   • Item number 86: Main switch
   • Item number 91: Resume switch
   • Item number 92: Set switch

   Q: Is the check result normal? 

   YES:  Go to Step  19.

   NO:  Go to Step 2.

2. STEP 2. Measure the terminal voltage at cruise control switch connector. 
   1. Remove the cruise control switch from the steering wheel with the cruise control switch connector connected (Refer to CLUTCH INTERLOCK SWITCH CHECK <M/T> ).
   2. Connect the negative battery terminal that was disconnected when the driver's air bag module was removed.
   3. Turn the ignition switch to the "ON" position.
   4. Do not operate the cruise control switch.
   5. Measure the terminal voltage between cruise control switch connector terminal ECM CNTS (number 94) line and ground with cruise control switch connector connected.

   OK: 4.7 - 5.0 V 

   Q: Is the check result normal? 

   YES:  Go to Step  11.

   NO:  Go to Step 3.

3. STEP 3. Measure the terminal voltage at ECM connector. 
   1. Turn the ignition switch to the "ON" position.
   2. Do not operate the cruise control switch.
   3. Measure the terminal voltage between ECM terminal CNTS (number 94) and ground.

   OK: 4.7 - 5.0 V 

   Q: Is the check result normal? 

   YES:  Go to Step  8.

   NO:  Go to Step 4.

4. STEP 4. Check the harness wire for short circuit to ground between ECM connector terminal CNTS (number 94) and cruise control switch connector. 
   1. Check the ECM connector.
   2. Disconnect ECM connector and measure at the harness connector side.
   3. Turn the ignition switch to the "LOCK" (OFF) position.
   4. Measure the continuity between ECM connector terminal CNTS (number 94) and ground.

   OK: open circuit 

   Q: Is the check result normal? 

   YES:  Go to Step  18.

   NO:  Go to Step 5.

5. STEP 5. Check the harness wire between ECM connector terminal CNTS (number 94) and clock spring connector, and between clock spring connector terminal and cruise control switch connector. 
   • Check connector or harness wire for short circuit and damage.

   Q: Is the check result normal? 

   YES:  Go to Step 6.

   NO:  Repair connector or damaged harness wire. Then go to Step  20.

6. STEP 6. Check the clock spring. 

   Refer to DRIVER'S AIR BAG MODULE AND CLOCK SPRING INSPECTION .

   Q: Is the check result normal? 

   YES:  Go to Step  7.

   NO:  Replace the clock spring, and install the driver's air bag module [Refer to DRIVER'S AIR BAG MODULE AND CLOCK SPRING ]. Then go to Step  20.

7. STEP 7. Check the cruise control switches. 

   Refer to CRUISE CONTROL SYSTEM COMPONENT CHECK .

   Q: Is the check result normal? 

   YES:  Go to Step  10.

   NO:  Replace the cruise control switches (Refer to CLUTCH INTERLOCK SWITCH CHECK <M/T> ). Then go to Step  20.

8. STEP 8. Check the harness wire between ECM connector terminal CNTS (number 94) and clock spring connector, and between clock spring connector and cruise control switch connector. 
   • Check connector or harness wire for open circuit and damage.

   Q: Is the check result normal? 

   YES:  Go to Step  9.

   NO:  Repair connector or damaged harness wire. Then go to Step  20.

9. STEP 9. Check the clock spring. 

   Refer to DRIVER'S AIR BAG MODULE AND CLOCK SPRING INSPECTION .

   Q: Is the check result normal? 

   YES:  Go to Step  10.

   NO:  Replace the clock spring, and install the driver's air bag module [Refer to , DRIVER'S AIR BAG MODULE AND CLOCK SPRING ]. Then go to Step  20.

10. STEP 10. Check the data list. 
    CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).

    Using scan tool (M. U. T-III), Check The Data List (REFER TO DATA LIST REFERENCE TABLE  ).

    • Item number 75: Cancel switch
    • Item number 86: Main switch
    • Item number 91: Resume switch
    • Item number 92: Set switch

    Q: Is the check result normal? 

    YES:  Go to Step  19.

    NO:  Go to Step  11.

11. STEP 11. Measure the terminal voltage at cruise control switch connector. 
    1. Remove the cruise control switch from the steering wheel with the cruise control switch connector connected (Refer to CLUTCH INTERLOCK SWITCH CHECK <M/T> ).
    2. Turn the ignition switch to the "ON" position.
    3. Press the cruise control ON/OFF switch with cruise control switch connector connected, and measure the terminal voltage between cruise control switch connector terminal ECM SW- line (number 93) and ground.

    OK: 0.5 volt or less 

    Q: Is the check result normal? 

    YES:  Go to Step  15.

    NO:  Go to Step  12.

12. STEP 12. Measure the terminal voltage at ECM connector. 
    1. Turn the ignition switch to the "ON" position.
    2. Press the cruise control ON/OFF switch, and ECM connector terminal SW- (number 93) and ground.

    OK: 0.5 volt or less 

    Q: Is the check result normal? 

    YES:  Go to Step  13.

    NO:  Go to Step  18.

13. STEP 13. Check the harness wire between ECM connector terminal SW- (number 93) and clock spring connector, and between clock spring connector and cruise control switch connector. 
    • Check connector or harness wire for open circuit and damage.

    Q: Is the check result normal? 

    YES:  Go to Step  14.

    NO:  Repair connector or damaged harness wire. Then go to Step  20.

14. STEP 14. Check the clock spring. 

    Refer to , DRIVER'S AIR BAG MODULE AND CLOCK SPRING INSPECTION .

    Q: Is the check result normal? 

    YES:  Go to Step  18.

    NO:  Replace the clock spring, and install the driver's air bag module [Refer to DRIVER'S AIR BAG MODULE AND CLOCK SPRING ]. Then go to Step  20.

15. STEP 15. Check the harness wire between ECM connector terminal SW- (number 93) and clock spring connector, and between clock spring connector and cruise control switch connector. 
    • Check connector or harness wire for short circuit and damage.

    Q: Is the check result normal? 

    YES:  Go to Step  16.

    NO:  Repair connector or damaged harness wire. Then go to Step  20.

16. STEP 16. Check the clock spring. 

    Refer to , DRIVER'S AIR BAG MODULE AND CLOCK SPRING INSPECTION .

    Q: Is the check result normal? 

    YES:  Go to Step  17.

    NO:  Replace the clock spring, and install the driver's air bag module [Refer to GROUP 52B, DRIVER'S AIR BAG MODULE AND CLOCK SPRING ]. Then go to Step  20.

17. STEP 17. Check the cruise control switches. 

    Refer to CRUISE CONTROL SYSTEM COMPONENT CHECK .

    Q: Is the check result normal? 

    YES:  Go to Step  18.

    NO:  Replace the cruise control switches (Refer to CLUTCH INTERLOCK SWITCH CHECK <M/T> ). Then go to Step  20.

18. STEP 18. Check the data list. 
    CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).

    Using scan tool (M. U. T-III), Check The Data List (REFER TO DATA LIST REFERENCE TABLE  ).

    • Item number 75: Cancel switch
    • Item number 86: Main switch
    • Item number 91: Resume switch
    • Item number 92: Set switch

    Q: Is the check result normal? 

    YES:  Go to Step  19.

    NO:  Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) ). Then go to Step  20.

19. STEP 19. Read the DTC. 
    1. Disconnect the negative battery terminal, to erase the DTC of the cruise control system.
    2. Turn the ignition switch to the "ON" position, and press the cruise control ON/OFF switch to turn the cruise control system to ON (the cruise control indicator light is turned on).
    3. After turning the cruise control system to ON, when two minutes or more has elapsed without operating the cruise control switches, read the DTC of the cruise control system (Refer to HOW TO DIAGNOSE THE CAN BUS LINES ).

    Q: Is DTC 15 set? 

    YES:  Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) ). Then go to Step  20.

    NO:  It can be assumed that this malfunction is intermittent (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .

20. STEP 20. Check the data list. 
    CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).

    Using scan tool (M. U. T-III), Check The Data List (REFER TO DATA LIST REFERENCE TABLE  ).

    • Item number 75: Cancel switch
    • Item number 86: Main switch
    • Item number 91: Resume switch
    • Item number 92: Set switch

    Q: Is the check result normal? 

    YES:  Go to Step  21.

    NO:  Return to Step  2.

21. STEP 21. Read the DTC. 
    1. Disconnect the negative battery terminal, to erase the DTC of the cruise control system.
    2. Turn the ignition switch to the "ON" position, and press the cruise control ON/OFF switch to turn the cruise control system to ON (turn ON the cruise control indicator t).
    3. After turning the cruise control system to ON, when two minutes or more has elapsed without operating the cruise control switches, read the DTC of the cruise control system (Refer to HOW TO DIAGNOSE THE CAN BUS LINES ).

    Q: Is DTC 15 set? 

    YES:  Return to Step  1.

    NO:  The procedure is complete.