INSPECTION PROCEDURE E-3: Keyless Entry System: Encrypted Code Cannot Be Registered.: Diagnosis
Required Special Tools:
- MB991223: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A
- STEP 1. Verify the trouble symptom.
Q: Can the encrypted code register mode be set?
- YES : Refer to INSPECTION PROCEDURE O-9 "ETACS-ECU DOSE NOT RECEIVE A SIGNAL FROM THE LOCK OR UNLOCK SWITCH ."
- NO : Go to Step 2.
- STEP 2. Check the input signal (by using the pulse checking mode of the monitor).
Check the input signals from the following switches:
- Key reminder switch
- Hazard warning light 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.- Connect scan tool MB991958 to the data link connector.
- Operate the scan tool MB991958 as follows:
- Select "SYSTEM SELECT."
- Select "SWS."
- Select "PULSE CHECK."
- Verify the scan tool MB991958 sounds or not.
- If the switches (see table below), which are applicable for the input signal check, are operated.
ITEM NAME - CHECK CONDITIONSITEM NAME CHECK CONDITIONS Key reminder switch Insert and remove the ignition key Hazard warning light switch Turn the hazard warning light switch from the "OFF" to "ON" position. Q: When the key reminder switch and the hazard warning light switch are operated, does scan tool MB991958 sound?
- YES < Buzzer of scan tool MB991958 sounds normally > : Replace the ETACS-ECU. Verify that the encrypted code can be registered in the transmitter.
- NO < Scan tool MB991958 does not sound when the ignition key is removed and reinserted > : Refer to INSPECTION PROCEDURE O-1 "ETACS-ECU DOES NOT RECEIVE A SIGNAL FROM THE KEY REMINDER SWITCH ."
- NO < Scan tool MB991958 does not sound when the hazard warning light switch is turned from "OFF" to "ON" > : Refer to INSPECTION PROCEDURE O-2 "ETACS-ECU DOES NOT RECEIVE A SIGNAL FROM THE HAZARD WARNING LIGHT SWITCH ."