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

Toyota Tacoma (2015-2018) Service Manual / Theft Deterrent / Theft Deterrent System / 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

*1: w/ Smart Key System

PROCEDURE

1.	CHECK SECURITY INDICATOR LIGHT OPERATION

(a) Close all doors and the engine hood.

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

*1: w/ Wireless Door Lock System
*2: w/ Smart Key System

(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.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

GO TO THEFT DETERRENT SYSTEM CANNOT BE SET OR UNSET

Some Alarm Functions do not Operate

DESCRIPTION When the alarm sounds, the following alarm functions operate: the roof console box assembly and No. 1 room light assembly illuminates, and the headlights, taillights and hazard lights ...

While Alarm is Armed, Engine Hood is opened but Alarm does not Sound

DESCRIPTION A situation in which the alarm is armed but does not sound when the hood is opened can be caused when the main body ECU (multiplex network body ECU) cannot detect whether the hood cou ...

Other materials:

Dtc Check / Clear
DTC CHECK / CLEAR HINT: DTCs which are stored in the ECM can be displayed on the Techstream. The Techstream can display pending DTCs and current DTCs. Some DTCs are not stored unless a malfunction is detected in consecutive driving cycles. When a malfunction is detected in o ...

Freeze Frame Data
FREEZE FRAME DATA DESCRIPTION (a) Whenever a lane departure alert system is stored, the forward recognition camera stores the current vehicle state (ECU and sensor information) as Freeze Frame Data. CHECK FREEZE FRAME DATA (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch ...

Diagnosis System
DIAGNOSIS SYSTEM 1. CHECK DLC3 (a) Check the DLC3 (See page ). 2. INSPECT BATTERY VOLTAGE (a) Measure the battery voltage. Standard Voltage: 11 to 14 V If the voltage is below 11 V, recharge or replace the battery. 3. SELF-DIAGNOSTIC MODE (OPERATING IGNITION KEY CYLINDER) (a) Switch to se ...