Inspection Procedure E-4

INSPECTION PROCEDURE E-4: Keyless Entry System: The liftgate or trunk lid is not opened when the keyless entry transmitter "LIFTGATE" button or "TRUNK LID" button is operated.

Transmitter "LIFTGATE" Input Signal:

CIRCUIT OPERATION
A receiver is incorporated in the ETACS-ECU. This receiver receives a lock or unlock signal from the transmitter.

TROUBLESHOOTING HINTS
- The keyless entry transmitter may be defective
- The ETACS-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: 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 central door locking system.

Check that the liftgate can be locked and unlocked when the central door locking system is operated.

Q: Does the liftgate work normally?

YES: Go to Step 2.

NO: Refer to Inspection Procedure C-2 "Some doors do not lock or unlock."

STEP 2. Check that the doors can be locked and unlocked by using the keyless entry transmitter.

Q: Can the doors be locked and unlocked normally when the keyless entry transmitter is operated?

YES: Go to Step 3.

NO: Refer to Inspection Procedure E-1 "Keyless entry system does not operate."

STEP 3. Check the input signal (by using the pulse check mode of the monitor).

Check input signals from the transmitter.

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.Refer to "How to connect SWS monitor.
2. Operate scan tool MB991958 according to the procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."

3. Push the transmitter "LIFTGATE" button.
4. Check that scan tool MB991958 sounds

Q: When the transmitter "LIFTGATE" button or "TRUNK LID" button is turned ON, does scan tool MB991958 sound?

YES: Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. Refer to Encrypted Code Registration Criteria Table in Antitheft and Alarm Systems. All the doors can be locked or unlocked by means of the transmitter.

NO: Refer to Inspection Procedure N-8 "ETACS-ECU does not receive any signal from the lock, unlock, liftgate , trunk lid or panic switch."