Inspection Procedure 7

INSPECTION Procedure 7: When the "ON/OFF" Switch is Turned ON, "CRUISE" Indicator Light does not Illuminate (However, Cruise Control System is Normal.)

CIRCUIT OPERATION
- The ECM detects "ON/OFF" switch ON signal to illuminate the "CRUISE" indicator light.
- The "CRUISE" indicator light illuminate signal is transmitted from the ECM to the combination meter via CAN bus line.

COMMENT
- The CAN bus line between the ECM and the ETACS-ECU and between the ETACS-ECU and the combination meter may be defective.
- The combination meter, ETACS-ECU or ECM may also be defective.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)
- Malfunction of CAN bus system.
- Damaged harness or connector.
- Malfunction of the combination meter.
- Malfunction of the ETACS-ECU.
- Malfunction of the ECM.

DIAGNOSTIC PROCEDURE

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

CAUTION: If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code (DTC) may be set. Prior to this diagnosis, diagnose the CAN bus lines.

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.
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.

Q: Is the check result satisfactory?

YES : Go to Step 2

NO : Repair the CAN bus lines. Then go to Step 6.

STEP 2. Using scan tool MB991958, check for MFI system DTC.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Check for MFI system DTC.

Q: Is DTC U0141 set?

YES : Repair the MFI system. Then go to Step 6.

NO : Go to Step 3.

STEP 3. Using scan tool MB991958, check for ETACS system DTC.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Check for ETACS system DTC.

Q: Is DTC U0155 set?

YES : Repair the ETACS system. Then go to Step 6.

NO : Go to Step 4.

STEP 4. Using scan tool MB991958, check the combination meter system actuator test item 7: Cruise indicator 1.

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 check the actuator test for combination meter system item 7: indicator 1.

Q: Is the check result satisfactory?

YES : Go to Step 5.

NO : Repair the combination meter system. Then go to Step 6.

STEP 5. Check the symptoms.

Q: When the "ON/OFF" switch is turned ON, is the "CRUISE" indicator light illuminated?

YES : It can be assumed that this malfunction is intermittent.

NO : Replace the ECM. When the ECM is replaced, register the encrypted code. Then go to Step 6.

STEP 6. Check the symptoms.

Q: When the "ON/OFF" switch is turned ON, is the "CRUISE" indicator light illuminated?

YES : The procedure is complete.

NO : Return to Step 1.