Inspection Procedure 11

Inspection Procedure 11: KOS timer lock function does not work.

CAUTION:
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

TECHNICAL DESCRIPTION (COMMENT)

After the door is unlocked using the keyless entry function or the door entry function, if no operation is performed, the door is locked when the time specified by a customization function has elapsed. However, when an open signal of any of the doors is received by ETACS-ECU or when the engine switch power supply mode is ON, the KOS timer lock function will not be activated.

TROUBLESHOOTING HINTS

- Malfunction of ETACS-ECU
- Malfunction of the door switches

DIAGNOSIS

STEP 1. Check the customize function.

Check that either of the followings other than "0sec" is set for "F.A.S.T. unlock disable time" with the customization function.

- 3sec
- 5sec

Q. Is the check result normal?

YES Go to Step 2.
NO Set either of the followings other than "F.A.S.T. unlock disable time" with the customization function (Refer to Configuration Function).
STEP 2. Check the door entry function operation

Check that the door entry function operation normally.

Q. Is the check result normal?

YES Go to Step 3.
NO Refer to trouble symptom chart Symptom Chart.
STEP 3. Using scan tool MB991958, read the diagnostic trouble code.

(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Refer to "How to connect scan too (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."

(2)Turn the power supply mode of the engine switch to ON.

(3)Check whether the KOS-ECU related DTC is set.

(4)Turn the power supply mode of the engine switch to OFF.

Q. Is the DTC set?

YES Diagnose the KOS-ECU. Refer to diagnostic trouble code chart Keyless Operation System (KOS).
NO Go to Step 4.
STEP 4. Check of the troubles

Check that the KOS timer lock function operates.

Q. Is the check result normal?

YES Intermittent malfunction is suspected How to Cope With Intermittent Malfunctions).
NO Perform troubleshooting for each door switch Symptom Chart).