Toyota Tacoma (2015-2018) Service Manual: While Alarm is Armed, Battery is Reconnected but Alarm does not Sound

DESCRIPTION

While the alarm is armed, the EEPROM inside the main body ECU (multiplex network body ECU) will remember the armed state even if the battery is disconnected, and the alarm will sound when the battery is reconnected.

If the alarm does not sound when the battery is reconnected, the alarm may not have been set, or there may be a malfunction in the main body ECU (multiplex network body ECU).

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration (See page ).*1

PROCEDURE

(a) Close all doors and the engine hood.

(b) Lock the doors using wireless operation*1, key linked operation or entry operation*2.

(c) Check that the security indicator light illuminates.

(d) After 30 seconds have elapsed, check that the security indicator light changes from illuminated to flashing.

HINT:

The illumination status of the security indicator light can be used to determine whether the theft deterrent system is set or unset.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

GO TO THEFT DETERRENT SYSTEM CANNOT BE SET OR UNSET