Inspection Procedure 8
INSPECTION PROCEDURE 8: When "ON/OFF" (MAIN) Switch is Turned ON, "CRUISE" Indicator Light Inside Combination Meter does not Illuminate (However, Auto-cruise Control System is Normal).CIRCUIT OPERATION
The ECM detects "ON/OFF" (MAIN) switch "ON" signal to illuminate the "CRUISE" indicator light on the combination meter.
COMMENT
Connector(s), wiring harness in the CAN bus line between the ECM and the combination meter, power supply to the ECM, the combination meter, the ETACS-ECU, the ECM may be defective.
TROUBLESHOOTING HINTS
- Malfunction of CAN bus system.
- Damaged harness or connector.
- Malfunction of the combination meter.
- Malfunction of the ETACS-ECU
- 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
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
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. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the check result satisfactory?
YES : Go to Step 2
NO : Repair the CAN bus lines (Refer to Controller Area Network, Diagnosis - Can Bus Diagnostic Chart). Then go to Step 6.
STEP 2. Using scan tool MB991958, check for MFI system diagnostic trouble code.
1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Check for MFI system diagnostic trouble code (Refer to MFI, Diagnosis - Diagnostic Function). Diagnostic Trouble Code Descriptions
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is DTC U0141 set?
YES : Refer to MFI, Diagnosis - Diagnostic Trouble Code Procedures - DTC U0141: ETACS-ECU CAN Communication Time Out. Then go to Step 6. U0141
NO : Go to Step 3.
STEP 3. Using scan tool MB991958, check for ETACS system diagnostic trouble code.
1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Check for ETACS system diagnostic trouble code (Refer to Chassis Electrical, ETACS - Troubleshooting - Diagnostic Function).
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is DTC U0155 set?
YES : Refer to Chassis Electrical, ETACS -Troubleshooting - Diagnostic Trouble Code Procedures - DTC U0155: Combination Meter-ECU CAN Communication Time Out. Then go to Step 6.
NO : Go to Step 4.
STEP 4. Using scan tool MB991958, check the combination meter system data list item F7: Cruise control indicator.
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 combination meter system item F7: Cruise control indicator (Refer to Chassis Electrical, Combination Meter - Data List Reference Table).
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the check result satisfactory?
YES : Go to Step 5.
NO : Repair the combination meter system (Refer to Chassis Electrical, Combination Meter - Troubleshooting - Symptom Procedures - Inspection Procedure 5: The combination meter light does not illuminate normally or the multi information display is not displayed normally). Then go to Step 6.
STEP 5. Retest the system.
Q: Does the "CRUISE" indicator light illuminate when the "ON/OFF" (MAIN) switch is turned ON?
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).
NO : Replace the ECM. When the ECM is replaced, register the encrypted code (Refer to Wireless Control Module, Troubleshooting - ID Code Registration Judgment Table). Then go to Step 6.
STEP 6. Retest the system.
Q: Does the "CRUISE" indicator light illuminate when the "ON/OFF" (MAIN) switch is turned ON?
YES : The procedure is complete.
NO : Return to Step 1.