Inspection Procedure 13

Inspection Procedure 13: 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 with the keyless entry function, if no operation is performed, the door is locked when the time specified by a customization function has elapsed. However, an open signal from any door, key reminder switch OFF (with the key inserted) signal, or ignition push switch ON signal has been input to ETACS, the KOS timer will not operate.

TROUBLESHOOTING HINTS

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

DIAGNOSIS

Required Special Tools:

- MB992006: Extra fine probe
- MB991223: Harness set
- MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A

STEP 1. Check the operation of the keyless operation system
(keyless entry system).

Operate the keyless operation key and check that all doors lock and unlock.

Q. Is the check result normal?

YES Go to Step 2.
NO Refer to inspection procedure 12: "Keyless entry system does not work Inspection Procedure 15."
STEP 2. Using scan tool MB991958, read the diagnostic trouble code.





(1)
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.

Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "ON" position.
(3)Check whether the KOS-ECU related DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Diagnose the KOS-ECU. Refer to Keyless Operation System (KOS).

NO Go to Step 3.

STEP 3. Check of the troubles

Check that the KOS timer lock function operates.

Q. Is the check result normal?

YES The diagnosis is complete.
NO Perform troubleshooting for each door switch Symptom Chart).