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
- MB991911: MUT-III Main Harness B
- STEP 1. Verify the trouble symptom.
Q: Can the encrypted code register mode be set?
YES: Refer to INSPECTION PROCEDURE P-10 "ETACS-ECU DOES NOT RECEIVE A SIGNAL FROM THE LOCK, UNLOCK SWITCH OR PANIC SWITCH ."
NO: Go to Step 2.
- STEP 2. Check the input signal (by using the pulse check 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 scan tool MB991958 as follows:
- Select "SYSTEM SELECT."
- Select "SWS."
- Select "PULSE CHECK."
- Verify scan tool MB991958 sounds or not.
- If the switches (see table below), which are applicable for the input signal check, are operated.ITEM & CONDITION CHART
ITEM NAME CHECK CONDITIONS Key reminder switch Insert and remove the ignition key Hazard warning light switch Turn the hazard warning light switch from the 0"OFF" to "ON" position.
Q: When the key reminder switch and the hazard warning light switch are operated, does scan tool MB991958 sound?
Buzzer of scan tool MB991958 sounds normally: Replace the ETACS-ECU. Verify that the encrypted code can be registered in the transmitter.
Scan tool MB991958 does not sound when the ignition key is removed and reinserted: Refer to INSPECTION PROCEDURE P-1 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE KEY REMINDER SWITCH ."
Scan tool MB991958 does not sound when the hazard warning light switch is turned from "OFF" to "ON": Refer to INSPECTION PROCEDURE P-2 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE HAZARD WARNING LIGHT SWITCH ."