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 .gif)
).*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
(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 | .gif) |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | |
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:
Transmission Range Sensor Circuit Malfunction (PRNDL Input) (P0705)
DESCRIPTION
The park/neutral position switch detects the shift lever position and sends signals
to the ECM.
DTC No.
DTC Detection Condition
Trouble Area
P0705
One of the following conditions is met:
(A) Any 2 or more of the followin ...
Parts Location
PARTS LOCATION
ILLUSTRATION
*A
for Double Cab
*B
for Access Cab
*C
w/ Back Door Power Window
-
-
*1
NO. 1 BACK PANEL PELAY
*2
NO. 2 BACK PANEL RELAY
...
Check Bus 2 Line for Short to +B
DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when no
resistance exists between terminal 18 (CA4H) of the central gateway ECU (network
gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the central
gateway ECU (network gateway ECU) and ...
