Inspection Procedure 1

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: When the Brake Pedal is Depressed, Auto-cruise Control System is not Cancelled.

COMMENT
The stoplight switch circuit is suspected.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Malfunction of CAN bus system.
- Damaged harness or connector.
- Malfunction of the stoplight switch.
- Malfunction of the ETACS-ECU
- Malfunction of the ECM.

DIAGNOSIS

STEP 1. Using scan tool MB991958, check data list item 74: Brake light switch and item 89: Normally closed brake 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 74: Brake light switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

- Item 89: Normally closed brake switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal 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 2.

NO : Refer to Diagnostic Trouble Code Procedures - DTC 22: Stoplight Switch System. Then go to Step 3. DTC 22

STEP 2. Check the symptoms.

Q: When the brake pedal is depressed, auto-cruise control system is cancelled?

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 3.

STEP 3. Check the symptoms.

Q: When the brake pedal is depressed, auto-cruise control system is cancelled?

YES : The procedure is complete.

NO : Return to Step 1.