INSPECTION PROCEDURE E-3: Encrypted code cannot be registered.

CAUTION

Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

If the encrypted code registration mode is not entered, the key reminder switch, the hazard warning lamp switch or the ETACS-ECU may be defective.
If the registration is not possible although the registration mode is entered, the keyless entry transmitter or the ETACS-ECU may be defective.

POSSIBLE CAUSES

Malfunction of the keyless entry transmitter

Malfunction of the ETACS-ECU

Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the encrypted code registration mode.

Check that the encrypted code registration mode is entered.

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Go to Step 2

Step 2. Pulse check

Check the input signals below which are related to the encrypted code of the keyless entry transmitter.

System switch	Check condition
Key reminder switch	When the inserted ignition key is pulled out
Hazard warning lamp switch	When the switch is turned from off to on
Keyless entry transmitter switch	When the switch is turned from off to on

OK: The MUT-II/III sounds or the voltmeter needle fluctuates.

Q: Is the check result normal?

All the signals are received normally.: Go to Step 3

.
The key reminder switch signal is not received.: Refer to Inspection Procedure P-12 "The key reminder switch signal is not received

."
The hazard warning lamp switch signal is not received.: Refer to Inspection Procedure P-13 "The hazard warning lamp switch signal is not received

."
The keyless entry transmitter switch signal is not received.: Refer to Inspection Procedure P-17 "Each switch signal of the keyless entry transmitter is not received

Step 3. Retest the system.

Check that the encrypted code can be registered.

Q: Is the check result normal?

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

).
NO: Replace the ETACS-ECU.