Inspection Procedure P-13

Transmitter: The ETACS-ECU does not Receive Any Signal from the Lock, Unlock, Trunk or Panic Switch.

Reciver And Transmitter Communication Circuit:

CIRCUIT OPERATION
The ETACS-ECU receives signal through its receiver from the transmitter, and operates the keyless entry system according to the signal.

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the systems, which are described in "CIRCUIT OPERATION", do not work normally.

TROUBLESHOOTING HINTS
- The transmitter may be defective
- The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicles communication interface (V.C.I.)
- MB991827: MUT-III USB cable
- MB991911: MUT-III Main harness B

STEP 1. Register the transmitter.
Replace the transmitter. Refer to Keyless Entry System, On-vehicle Service, How To Secret Registration Method.

Q: Can the transmitter be registered correctly?

YES: If the systems, which are described in "CIRCUIT OPERATION", work normally, the input signal from the transmitter should be normal.

NO: Go to Step 2.




STEP 2. Check the transmitter battery.Measure the voltage of the transmitter battery.
- The value should be approximately 2.5 - 3.2 volts.

Q: Is the measured voltage approximately 2.5 - 3.2 volts (battery positive voltage)?

YES: Go to Step 3.

NO: Replace the battery. If the transmitter can be registered normally, and the systems, which are described in "CIRCUIT OPERATION", operate normally, it indicates that the transmitter is sending normal signal to the ECU.

STEP 3. Check the transmitter.
Substantial other transmitter in order to register encrypted code. Refer to Keyless Entry System, On-vehicle Service, How To Secret Registration Method.

Q: Can the transmitter be registered correctly?

YES: If the systems, which are described in "CIRCUIT OPERATION", work normally, the input signal from the transmitter should be normal.

NO: Replace the ETACS-ECU. If the systems, which are described in "CIRCUIT OPERATION", work normally, the input signal from the transmitter should be normal.