Toyota Tacoma (2015-2018) Service Manual: Theft Deterrent System Unexpectedly Sets Itself

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

DESCRIPTION

A situation in which the theft deterrent system unexpectedly sets itself can be caused when the main body ECU (multiplex network body ECU) cannot detect whether a door is open or closed.

If the theft deterrent system unexpectedly sets itself, there may be a malfunction in a courtesy switch, the main body ECU (multiplex network body ECU) or a wire harness.

WIRING DIAGRAM

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
The theft deterrent system is also set when doors are locked by the auto lock function of the wireless door lock system.

PROCEDURE

1.	CHECK WIRELESS DOOR LOCK SYSTEM OPERATION

(a) Check that the auto lock function of the wireless door lock system can be canceled.

(1) Unlock the doors using wireless operation or entry operation.

(2) Within 60 seconds, open and close one of the doors.

Result

Result	Proceed to
Door locks are locked	A
Door locks are not locked	B

END (SYSTEM NORMAL)

2.	READ VALUE USING TECHSTREAM (RR DOOR COURTESY SW, RL DOOR COURTESY SW, BACK DOOR COURTESY SW, FR DOOR COURTESY SW AND FL DOOR COURTESY SW

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Main Body

Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
RR Door Courtesy SW	Rear door courtesy light switch assembly RH signal / ON or OFF	OFF: Rear door RH closed ON: Rear door RH open	-
RL Door Courtesy SW	Rear door courtesy light switch assembly LH signal / ON or OFF	OFF: Rear door LH closed ON: Rear door LH open	-
FR Door Courtesy SW	Front door courtesy light switch assembly RH signal / ON or OFF	OFF: Front door RH closed ON: Front door RH open	-
FL Door Courtesy SW	Front door courtesy light switch assembly LH signal / ON or OFF	OFF: Front door LH closed ON: Front door LH open	-

OK:

Normal conditions listed above are displayed.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

GO TO LIGHTING SYSTEM

Theft Deterrent System is not Unset when Engine is Running

DESCRIPTION The theft deterrent system is unset when the IG signal and engine speed signal are input to the main body ECU (multiplex network body ECU) for 2 seconds or more continuously. The eng ...

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 ...

Other materials:

Operation Check
OPERATION CHECK INPUT SIGNAL CHECK *a +RES *b -SET *c ON-OFF *d CANCEL (a) Connect the Techstream to the DLC3. (b) Check the cruise control main switch using the Data List functio ...

Installation
INSTALLATION PROCEDURE 1. INSTALL WINDSHIELD WIPER MOTOR ASSEMBLY (a) Apply MP grease to the crank arm pivot of the windshield wiper motor assembly. Text in Illustration *1 Crank Arm Pivot ...

Lost Communication with ECM / PCM (U0100,U0140,U0142,U0155,U1117)
DESCRIPTION These DTCs are stored when there is a CAN communication malfunction between the certification ECU (smart key ECU assembly), ECM, main body ECU (multiplex network body ECU) or combination meter assembly, and data from the option connector (bus buffer ECU) cannot be received. HINT: ...