DTC 15
DTC 15: Cruise Control Switch SystemCruise Control Switch Circuit (Part 1):
Cruise Control Switch Circuit (Part 2):
CIRCUIT OPERATION
This circuit judges the signals of each switch ("ON/OFF", "CANCEL", "COAST/SET" and "ACC/RES") of the cruise control switch. The ECM detects the state of the cruise control switch by sensing the voltages shown below.
- When all switches are released: 4.7 - 5.0 volts
- When the "ON/OFF" switch is pressed: 0 - 0.5 volt
- When the "CANCEL" switch is pressed: 1.0 - 1.8 volts
- When the "COAST/SET" switch is pressed: 2.3 - 3.0 volts
- When the "ACC/RES" switch is pressed: 3.5 - 4.2 volts
DTC SET CONDITIONS
Check Condition
- The "CRUISE" indicator light illuminates.
Judgement Criteria
- This DTC will be set when the "COAST/SET" switch or the "ACC/RES" switch is continuously ON foe 60 seconds or more.
TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Damaged harness or connector.
- Malfunction of the cruise control switch.
- Malfunction of the clock spring.
- Malfunction of the ECM.
DIAGNOSIS
Required Special Tools:
- MB991958: Scan Tool (M.U.T-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T-III USB Cable
- MB991910: M.U.T-III Main Harness A
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB992110: Power Plant ECU Check Harness
STEP 1. Using scan tool MB991958, check the data list item 86: Main switch, item 92: Set switch, item 91: Resume switch and item 75: Cancel switch.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading Diagnostic Trouble Codes
- Item 86: Main switch.
- When the "ON/OFF" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "ON/OFF" switch is pressed again, the display on scan tool MB991958 should be "OFF".
- Item 92: Set switch.
- When the "COAST/SET" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "COAST/SET" switch is released, the display on scan tool MB991958 should be "OFF".
- Item 91: Resume switch.
- When the "ACC/RES" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "ACC/RES" switch is released, the display on scan tool MB991958 should be "OFF".
- Item 75: Cancel switch.
- When the "CANCEL" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "CANCEL" switch is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 18.
NO : Go to Step 2.
STEP 2. Measure the power supply voltage at cruise control switch connector C-201 by backprobing.
1. Remove the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring).
2. Remove the cruise control switch from the steering wheel with the cruise control switch connector connected.
3. Connect the negative (-) battery cable.
4. Do not disconnect cruise control switch connector C-201.
5. Turn the ignition switch to the "ON" position.
6. Do not operate the cruise control switch.
7. Measure the power supply voltage between cruise control switch connector C-201 terminal 3 and ground by backprobing.
8. Turn the ignition switch to the "LOCK" (OFF) position.
9. Install the cruise control switch to the steering wheel.
Q: Is the measured voltage between 4.7 and 5.0 volts?
YES : Go to Step 9.
NO : Go to Step 3.
STEP 3. Measure the power supply voltage at ECM connector B-11.
1. Disconnect all the connectors from the ECM.
2. Connect special tool MB992110 between the ECM and the body-side harness connector.
3. Turn the ignition switch to the "ON" position.
4. Do not operate the cruise control switch.
5. Measure the power supply voltage between special tool 48-pin connector terminal 107 (ECM connector B-11 terminal 107) and ground.
6. Turn the ignition switch to the "LOCK" (OFF) position.
7. Disconnect special tool MB992110 between the ECM and the body-side harness connector.
8. Reconnect all the connectors to the ECM.
Q: Is the measured voltage between 4.7 and 5.0 volts?
YES : Go to Step 6.
NO : Go to Step 4.
STEP 4. Check ECM connector B-11 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 General (Electrical), Harness Connector Inspection). Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 5. Check the harness for short circuit to ground between the ECM connector B-11 terminal 107 and the cruise control switch connector C-201 terminal 3.
1. Disconnect ECM connector B-11 and measure at the harness connector side.
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Measure the continuity between ECM connector B-11 terminal 107 and ground.
4. Reconnect ECM connector B-11.
Q: Is the measured continuity open circuit?
YES : Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 17.
NO : Go to Step 6.
STEP 6. Check intermediate connector C-34, cruise control switch connector C-201 and clock spring connectors C-202 and C-204 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 7.
NO : Repair or replace the faulty connector (Refer to General (Electrical), Harness Connector Inspection). Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 7. Check the harness wire between ECM connector B-11 terminal 107 and cruise control switch connector C-201 terminal 3 for damage.
Q: Are the harness wires in good condition?
YES : Go to Step 8.
NO : Repair the damaged harness wire. Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 8. Check the clock spring.
Refer to SRS, Air Bag Modules and Clock Spring Inspection.
Q: Is the clock spring in good condition?
YES : It can be assumed that this malfunction is intermittent (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points-How to Cope with Intermittent Malfunction). Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring).
NO : Replace the clock spring. Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 9. Measure the ground voltage at cruise control switch connector C-201 by backprobing.
1. Remove the cruise control switch from the steering wheel with the cruise control switch connector connected.
2. Do not disconnect cruise control switch connector C-201.
3. Turn the ignition switch to the "ON" position.
4. Press the "ON/OFF" switch.
5. Measure the ground voltage between cruise control switch connector C-201 terminal 2 and ground by backprobing.
6. Release the "ON/OFF" switch.
7. Turn the ignition switch to the "LOCK" (OFF) position.
8. Install the cruise control switch to the steering wheel.
Q: Is the measured voltage 0.3 volt or less?
YES : Go to Step 15.
NO : Go to Step 10.
STEP 10. Measure the ground voltage at ECM connector B-11.
1. Disconnect all the connectors from the ECM.
2. Connect special tool MB992110 between the ECM and the body-side harness connector.
3. Turn the ignition switch to the "ON" position.
4. Press the "ON/OFF" switch.
5. Measure the ground voltage between special tool 48-pin connector terminal 95 (ECM connector B-11 terminal 95) and ground.
6. Release the "ON/OFF" switch.
7. Turn the ignition switch to the "LOCK" (OFF) position.
8. Disconnect special tool MB992110 between the ECM and the body-side harness connector.
9. Reconnect all the connectors to the ECM.
Q: Is the measured voltage 0.3 volt or less?
YES : Go to Step 12.
NO : Go to Step 11.
STEP 11. Check ECM connector B-11 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are the connector and terminals in good condition?
YES : Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 17.
NO : Repair or replace the faulty connector (Refer to General (Electrical), Harness Connector Inspection). Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 12. Check ECM connector B-11, intermediate connector C-34, cruise control switch connector C-201 and clock spring connectors C-202 and C-204 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 13.
NO : Repair or replace the faulty connector (Refer to General (Electrical), Harness Connector Inspection). Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 13. Check the harness wire between ECM connector B-11 terminal 95 and cruise control switch connector C-201 terminal 2 for damage.
Q: Are the harness wires in good condition?
YES : Go to Step 14.
NO : Repair the damaged harness wire. Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 14. Check the clock spring.
Refer to SRS, Air Bag Modules and Clock Spring Inspection.
Q: Is the clock spring in good condition?
YES : It can be assumed that this malfunction is intermittent (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points- How to Cope with Intermittent Malfunction). Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring).
NO : Replace the clock spring. Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 15. Check cruise control switch connector C-201 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 16.
NO : Repair or replace the faulty connector (Refer to General (Electrical), Harness Connector Inspection). Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 16. Check the cruise control switch.
1. Remove the cruise control switch (Refer to Engine and Emission Control).
2. Measure the resistance between terminal 2 and terminal 3 when each of the "ON/OFF", "COAST/SET", "ACC/RES" and "CANCEL" switch is pressed.
Q: Is the resistance within specifications?
YES : Install the cruise control switch and the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 17.
NO : Replace the cruise control switch. Install the driver's air bag module (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 17. Using scan tool MB991958, check the data list item 86: Main switch, item 92: Set switch, item 91: Resume switch and item 75: Cancel switch.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system.
- Item 86: Main switch.
- When the "ON/OFF" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "ON/OFF" switch is pressed again, the display on scan tool MB991958 should be "OFF".
- Item 92: Set switch.
- When the "COAST/SET" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "COAST/SET" switch is released, the display on scan tool MB991958 should be "OFF".
- Item 91: Resume switch.
- When the "ACC/RES" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "ACC/RES" switch is released, the display on scan tool MB991958 should be "OFF".
- Item 75: Cancel switch.
- When the "CANCEL" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "CANCEL" switch is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 18.
NO : Replace the ECM [2.4L Engine] or ECM [3.0L Engine]. Then go to Step 19.
STEP 18. Read the diagnostic trouble code.
1. Erase diagnostic trouble code. (Refer to Engine and Emission Control). Clearing Diagnostic Trouble Codes
2. Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn on the "CRUISE" indicator light).
3. After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches, read the diagnostic trouble code of the cruise control system (Refer to Engine and Emission Control). Reading Diagnostic Trouble Codes
Q: Is DTC 15 set?
YES : Replace the ECM [2.4L Engine] or ECM [3.0L Engine]. Then go to Step 19.
NO : It can be assumed that this malfunction is intermittent (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points- How to Cope with Intermittent Malfunction).
STEP 19. Using scan tool MB991958, check the data list item 86: Main switch, item 92: Set switch, item 91: Resume switch and item 75: Cancel switch.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading Diagnostic Trouble Codes
- Item 86: Main switch.
- When the "ON/OFF" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "ON/OFF" switch is pressed again, the display on scan tool MB991958 should be "OFF".
- Item 92: Set switch.
- When the "COAST/SET" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "COAST/SET" switch is released, the display on scan tool MB991958 should be "OFF".
- Item 91: Resume switch.
- When the "ACC/RES" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "ACC/RES" switch is released, the display on scan tool MB991958 should be "OFF".
- Item 75: Cancel switch.
- When the "CANCEL" switch is pressed, the display on scan tool MB991958 should be "ON".
- When the "CANCEL" switch is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 20.
NO : Return to Step 2.
STEP 20. Read the diagnostic trouble code.
1. Erase diagnostic trouble code. Clearing Diagnostic Trouble Codes
2. Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn on the "CRUISE" indicator light).
3. After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches, read the diagnostic trouble code of the cruise control system. Reading Diagnostic Trouble Codes
Q: Is DTC 15 set?
YES : Return to Step 1.
NO : The procedure is complete.