DTC 15
DTC15 : 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 ("COAST/SET", "ACC/RES" and "CANCEL") of the auto-cruise control switch. The ECM
- When all switches are OFF: 4.7 - 5.0 volts
- When the "CRUISE" (MAIN) switch is "ON": 0 - 0.3 volt
- When the "COAST/SET" switch is ON: 2.0 - 2.8 volts
- When the "ACC/RES" switch is ON: 3.3 - 4.1 volts
- When the "CANCEL" switch is ON: 0.8 - 1.5 volts
DTC SET CONDITIONS
Check Condition
- The "CRUISE" indicator light illuminates.
Judgement Criteria
- If the auto-cruise control switch is operated, this DTC will be set when the ECM
TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)
- Malfunction of the auto-cruise control switch.
- Malfunction of the clock spring.
- Damaged harness or connector.
- Malfunction of the ECM
- Malfunction of the PCM .
DIAGNOSIS
Required Special Tools:
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B
- MB991223: Harness Set
- MB992006: Extra Fine Probe
STEP 1. Using scan tool MB991958, check data list item 01: Main Switch, list item 02: Set Switch, item 03: Resume Switch and list item 04: 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.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data list mode.
- Item 01: Main Switch.
- When "CRUISE" (MAIN) switch is at the "ON" position, the display on scan tool MB991958 should be "ON."
- When ""CRUISE" (MAIN) switch is at the "OFF" position, the display on scan tool MB991958 should be "OFF."
4. Set scan tool MB991958 to data list mode.
- Item 02: 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."
5. Set scan tool MB991958 to data list mode.
- Item 03: 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."
6. Set scan tool MB991958 to data list mode.
- Item 04: Cancel Switch.
- When "CANCEL" 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."
7. Turn the ignition switch to the "LOCK" (OFF) position.
8. Disconnect scan tool MB991958.
Q: Is the switch operating properly?
YES: Go to Step 17.
NO: Go to Step 2.
STEP 2. Measure the power supply voltage at auto-cruise control switch connector C-202 by backprobing.
1. Remove the air bag module (driver's side).
2. Connect the negative (-) battery cable.
3. Do not disconnect auto-cruise control switch connector C-202.
4. Turn the ignition switch to the "ON" position and the "CRUISE" (MAIN) switch to the "OFF" position.
5. Measure the voltage between connector C-202 terminal 2 and ground by backprobing.
- The voltage should measure between 4.7 and 5.0 volts.
6. 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 C-139
1. Do not disconnect ECM connector C-139
2. Turn the ignition switch to the "ON" position and the "CRUISE" (MAIN) switch to the "OFF" position.
3. Measure the voltage between ECM connector C-139
- The measured voltage should measure between 4.7 and 5.0 volts.
4. 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 6.
NO: Go to Step 4.
STEP 4. Check ECM connector C-139
Q: Is the connector and terminals in good condition?
YES: Go to Step 5.
NO: Repair or replace the faulty connector, and install the air bag module (driver's side). Then go to Step 18.
STEP 5. Check the harness for short circuit to ground between the ECM connector C-139
1. Disconnect ECM connector C-139
2. Turn the ignition switch to the "ON" position and the "CRUISE" (MAIN) switch to the "OFF" position.
3. Measure the continuity between ECM connector C-139
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Connect ECM connector C-139
Q: Is the measured continuity open circuit?
YES: Install the air bag module (driver's side). Then go to Step 17.
NO: Go to Step 6.
STEP 6. Check auto-cruise control switch connector C-202, intermediate connector C-229-1 and C-108 and clock spring connectors C-204 and C-229 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are there connectors and terminals in good condition?
YES: Go to Step 7.
NO: Repair or replace the faulty connector, and install the air bag module (driver's side). Then go to Step 18.
STEP 7. Check the harness wire between ECM connector C-139
Q: Are there harness wires in good condition?
YES: Go to Step 8.
NO: Repair the damaged harness wire, and install the air bag module (driver's side). Then go to Step 18.
STEP 8. Check the clock spring.
Refer to, Air Bag Modules and Clock Spring.
Q: Is the clock spring in good condition?
YES: It can be assumed that this malfunction is intermittent, and install the air bag module (driver's side). Then go to Step 18.
NO: Replace the clock spring and install the air bag module (driver's side). Then go to Step 18.
STEP 9. Measure the ground voltage at auto-cruise control switch connector C-202 by backprobing.
1. Do not disconnect auto-cruise control switch connector C-207.
2. Turn the ignition switch to the "ON" position and the "CRUISE" (MAIN) switch to the "ON" position.
3. Measure the voltage between connector C-202 terminal 3 and ground.
- The measured voltage should measure 0.5 volt or less.
4. Turn the "CRUISE" (MAIN) switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage 0.5 volt or less?
YES: Go to Step 15.
NO: Go to Step 10.
STEP 10. Measure the ground voltage at ECM connector C-141
1. Do not the disconnect ECM connector C-141
2. Turn the ignition switch to the "ON" position and the "CRUISE" (MAIN) switch to the "ON" position.
3. Measure the voltage between ECM connector C-141
- The measured voltage should measure 0.5 volt or less.
4. Turn the "CRUISE" (MAIN) switch to the "OFF" position and the ignition switch to the "OFF" position.
Q: Is the measured voltage 0.5 volt or less?
YES: Go to Step 12.
NO: Go to Step 11.
STEP 11. Check ECM connector C-141
Q: Is the connector and terminals in good condition?
YES: Install the air bag module (driver's side). Then go to Step 17.
NO: Repair or replace the faulty connector, and install the air bag module (driver's side). Then go to Step 18.
STEP 12. Check ECM connector C-141
Q: Are there connectors and terminals in good condition?
YES: Go to Step 13.
NO: Repair or replace the faulty connector, and install the air bag module (driver's side). Then go to Step 18.
STEP 13. Check the harness wire between ECM connector C-141
Q: Are there harness wires in good condition?
YES: Go to Step 14.
NO: Repair the damaged harness wire, and install the air bag module (driver's side). Then go to Step 18.
STEP 14. Check the clock spring.
Refer to, Air Bag Modules and Clock Spring.
Q: Is the clock spring in good condition?
YES: It can be assumed that this malfunction is intermittent, and install the air bag module (driver's side). Then go to Step 18.
NO: Replace the clock spring and install the air bag module (driver's side). Then go to Step 18.
STEP 15. Check auto-cruise control switch connector C-202 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is the connector and terminals in good condition?
YES: Go to Step 16.
NO: Repair or replace the faulty connector, and install the air bag module (driver's side). Then go to Step 18.
STEP 16. Check the auto-cruise control switch.
1. Remove auto-cruise control switch.
2. Measure the resistance between terminal 2 and terminal 3 when each of the "CRUISE" (MAIN), "COAST/SET", "ACC/ RES" and "CANCEL" switch is pressed.
Q: Is the resistance within specifications?
YES: Install the air bag module (driver's side). Then go to Step 17.
NO: Replace the auto-cruise control switch, and install the air bag module (driver's side). Then go to Step 18.
STEP 17. Using scan tool MB991958, read the diagnostic trouble code.
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.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to read the diagnostic trouble codes.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is DTC 15 set?
YES: Replace the ECM
NO: It can be assumed that this malfunction is intermittent.
STEP 18. Using scan tool MB991958, read the diagnostic trouble code.
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.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to read the diagnostic trouble codes.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is DTC 15 set?
YES: Return to Step 1.
NO: The procedure is complete.