DTC 15
DTC 15: Auto-cruise Control Switch SystemAuto-cruise Control Switch System Circuit (Part 1):
Auto-cruise Control Switch System Circuit (Part 2):
CIRCUIT OPERATION
This circuit judges the signals of each switch ["ON/OFF" (MAIN), "CANCEL", "COAST/SET" and "ACC/RES"] of the auto-cruise control switch. The ECM detects the state of the auto-cruise control switch by sensing the voltages shown below.
- When all switches are OFF: 4.7 - 5.0 volts
- When the "ON/OFF" (MAIN) switch is "ON": 0 - 0.5 volt
- When the "CANCEL" switch is "ON": 1.0 - 1.8 volts
- When the "COAST/SET" switch is "ON": 2.3 - 3.0 volts
- When the "ACC/RES" switch is "ON": 3.5 - 4.2 volts
DTC SET CONDITIONS
Check Condition
- The "CRUISE" indicator light illuminates.
Judgement Criteria
- This DTC is set when the "COAST/SET" switch or "ACC/RES" switch is stuck to ON.
TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Damaged harness or connector.
- Malfunction of the auto-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 75: Cancel switch, item 86: Main switch, item 91: Resume switch and item 92: Set 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 auto-cruise control system. Reading Diagnostic Trouble Codes
- Item 75: Cancel switch.
- When "CANCEL" switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "CANCEL" switch is at the "OFF" position, the display on scan tool MB991958 should be "OFF".
- Item 86: Main switch.
- When "ON/OFF" (MAIN) switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "ON/OFF" (MAIN) switch is at the "OFF" position, the display on scan tool MB991958 should be "OFF".
- Item 91: Resume switch.
- When "ACC/RES" switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "ACC/RES" switch is at the "OFF" position, the display on scan tool MB991958 should be "OFF".
- Item 92: Set switch.
- When "COAST/SET" switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "COAST/SET" switch is at the "OFF" position, 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 auto-cruise control switch connector C-203 by backprobing.
1. Remove the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring).
2. With the harness connector, remove the auto-cruise control switch.
3. Connect the negative (-) battery cable.
4. Do not disconnect auto-cruise control switch connector C-203.
5. Turn the ignition switch to the "ON" position.
6. All auto-cruise control switch to the "OFF" position.
7. Measure the power supply voltage between auto-cruise control switch connector C-203 terminal 3 and ground by backprobing.
8. Turn the ignition switch to the "LOCK" (OFF) position.
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-109.
1. Remove 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. All auto-cruise control switch to the "OFF" position.
5. Measure the power supply voltage between special tool 48-pin connector terminal 37 (ECM connector B-109 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. Install 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-109 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 auto-cruise control switch and the air bag module (driver's side) (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-109 terminal 107 and the auto-cruise control switch connector C-203 terminal 3.
1. Disconnect ECM connector B-109 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-109 terminal 107 and ground.
4. Reconnect ECM connector B-109.
Q: Is the measured continuity open circuit?
YES : Install the auto-cruise control switch and the air bag module (driver's side) (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-127, auto-cruise control switch connector C-203 and clock spring connectors C-204 and C-205 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 auto-cruise control switch and the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 7. Check the clock spring.
Refer to Air Bag Modules and Clock Spring Inspection.
Q: Is the clock spring in good condition?
YES : Go to Step 8.
NO : Replace the clock spring (Refer to SRS, Air Bag Modules and Clock Spring). Install the auto-cruise control switch and the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 8. Check the harness wire between ECM connector B-109 terminal 107 and auto-cruise control switch connector C-203 terminal 3 for damage.
Q: Are the harness wires 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 auto-cruise control switch and the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
NO : Repair the damaged harness wire. Install the auto-cruise control switch and the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 9. Measure the ground voltage at auto-cruise control switch connector C-203 by backprobing.
1. Do not disconnect auto-cruise control switch connector C-203.
2. Turn the ignition switch to the "ON" position.
3. Turn the "ON/OFF" (MAIN) switch to the "ON" position.
4. Measure the ground voltage between auto-cruise control switch connector C-203 terminal 2 and ground by backprobing.
5. Turn the "ON/OFF" (MAIN) switch to the "OFF" position.
6. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage 0.52 volt or less?
YES : Go to Step 15.
NO : Go to Step 10.
STEP 10. Measure the ground voltage at ECM connector B-109.
1. Remove 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. Turn the "ON/OFF" (MAIN) switch to the "ON" position.
5. Measure the ground voltage between special tool 48-pin connector terminal 25 (ECM connector B-109 terminal 95) and ground.
6. Turn the "ON/OFF" (MAIN) switch to the "OFF" position.
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. Install 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-109 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 auto-cruise control switch and the air bag module (driver's side) (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 auto-cruise control switch and the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 12. Check ECM connector B-109, intermediate connector C-127, auto-cruise control switch connector C-203 and clock spring connectors C-204 and C-205 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 auto-cruise control switch and the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 13. Check the clock spring.
Refer to Air Bag Modules and Clock Spring Inspection.
Q: Is the clock spring in good condition?
YES : Go to Step 14.
NO : Replace the clock spring (Refer to SRS, Air Bag Modules and Clock Spring). Install the auto-cruise control switch and the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 14. Check the harness wire between ECM connector B-109 terminal 95 and auto-cruise control switch connector C-203 terminal 2 for damage.
Q: Are the harness wires 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 auto-cruise control switch (Refer to Engine and Emission Control) and the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
NO : Repair the damaged harness wire. Install the auto-cruise control switch and the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 15. Check auto-cruise control switch connector C-203 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 auto-cruise control switch and the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 16. Check the auto-cruise control switch.
1. Remove the auto-cruise control switch.
2. Measure the resistance between terminal 2 and terminal 3 when each of the "ON/OFF" (MAIN), "COAST/SET", "ACC/RES" and "CANCEL" switch is pressed.
Q: Is the resistance within specifications?
YES : Install the auto-cruise control switch and the air bag module (driver's side) (Refer to SRS, Air Bag Modules and Clock Spring). Then go to Step 17.
NO : Replace the auto-cruise control switch. Install the air bag module (driver's side) ( SRS, Air Bag Modules and Clock Spring). Then go to Step 19.
STEP 17. Using scan tool MB991958, check data list item 75: Cancel switch, item 86: Main switch, item 91: Resume switch and item 92: Set switch.
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 auto-cruise control system. Reading Diagnostic Trouble Codes
- Item 75: Cancel switch.
- When "CANCEL" switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "CANCEL" switch is at the "OFF" position, the display on scan tool MB991958 should be "OFF".
- Item 86: Main switch.
- When "ON/OFF" (MAIN) switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "ON/OFF" (MAIN) switch is at the "OFF" position, the display on scan tool MB991958 should be "OFF".
- Item 91: Resume switch.
- When "ACC/RES" switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "ACC/RES" switch is at the "OFF" position, the display on scan tool MB991958 should be "OFF".
- Item 92: Set switch.
- When "COAST/SET" switch is at the "ON" position,the display on scan tool MB991958 should be "ON".
- When "COAST/SET" switch is at the "OFF" position, 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. When the ECM is replaced, register the encrypted code (Refer to Troubleshooting - ID Code Registration Judgment Table). Then go to Step 19.
STEP 18. Read the diagnostic trouble code.
1. Disconnect the negative (-) battery terminal, to erase the diagnostic trouble code of the auto-cruise control system.
2. Connect the negative (-) battery terminal.
3. Turn the ignition switch to the "ON" position, and press the "ON/OFF" (MAIN) switch to turn the auto-cruise control system to ON (turn on the "CRUISE" indicator light).
4. After turning the auto-cruise control system to ON, when 2 minutes or more has elapsed without operating the auto-cruise control switches, read the diagnostic trouble code of the auto-cruise control system. Reading Diagnostic Trouble Codes
Q: Is DTC 15 set?
YES : Replace the ECM. When the ECM is replaced, register the encrypted code (Refer to Troubleshooting -ID Code Registration Judgment Table). 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 data list item 75: Cancel switch, item 86: Main switch, item 91: Resume switch and item 92: Set switch.
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 auto-cruise control system. Reading Diagnostic Trouble Codes
- Item 75: Cancel switch.
- When "CANCEL" switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "CANCEL" switch is at the "OFF" position, the display on scan tool MB991958 should be "OFF".
- Item 86: Main switch.
- When "ON/OFF" (MAIN) switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "ON/OFF" (MAIN) switch is at the "OFF" position, the display on scan tool MB991958 should be "OFF".
- Item 91: Resume switch.
- When "ACC/RES" switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "ACC/RES" switch is at the "OFF" position, the display on scan tool MB991958 should be "OFF".
- Item 92: Set switch.
- When "COAST/SET" switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "COAST/SET" switch is at the "OFF" position, 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. Disconnect the negative (-) battery terminal, to erase the diagnostic trouble code of the auto-cruise control system.
2. Connect the negative (-) battery terminal.
3. Turn the ignition switch to the "ON" position, and press the "ON/OFF" (MAIN) switch to turn the auto-cruise control system to ON (turn on the "CRUISE" indicator light).
4. After turning the auto-cruise control system to ON, when 2 minutes or more has elapsed without operating the auto-cruise control switches, read the diagnostic trouble code of the auto-cruise control system. Reading Diagnostic Trouble Codes
Q: Is DTC 15 set?
YES : Return to Step 1.
NO : The procedure is complete.