Inspection Procedure P-20: Each switch signal of the keyless entry transmitter is not received.

caution

Whenever the ECU is replaced, ensure that the input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

Input signal from the keyless entry transmitter is used to operate the keyless entry system. If the signal is abnormal, the keyless entry system will not work normally.

POSSIBLE CAUSES

Malfunction of the keyless entry transmitter
Defective battery of the keyless entry transmitter
Malfunction of the ETACS-ECU

DIAGNOSTIC PROCEDURE

Step 1. Pulse check

Check whether the ETACS-ECU receives signal from a transmitter or not. For this check, you should use the 2-button-type transmitter (integrated with a key), which cover screw is silver and has already been registered.

note

For how to register the keyless entry transmitter encrypted code, refer to GROUP 42 - On-vehicle Service

System switch	Check condition
Keyless entry transmitter "LOCK/UNLOCK" switch	When the switch is turned from off to on

OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Is the check result normal?

	Go to Step 2.

	Go to Step 4.

Step 2. Check the transmitter battery.

Refer to GROUP 42 - Keyless entry system

Q. Is the check result normal?

	Go to Step 3.

	Replace the keyless entry transmitter battery.

Step 3. Register the encrypted code, and then retest the system.

(1)Register the keyless entry transmitter again.

(2)Check that each signal is received from the keyless entry transmitter.

Q. Is the check result normal?

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

	Replace the keyless entry transmitter.

Step 4. Retest the system.

Check that each signal is received from the keyless entry transmitter.

Q. Is the check result normal?

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

	Replace the ETACS-ECU.