Toyota Tacoma 2015-2018 Service Manual: 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
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).*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 |
| B | .gif) |
END (SYSTEM NORMAL) |
|
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|
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.
(c) Turn the Techstream 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.
| OK | |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | |
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:
Transmission Fluid Temperature Sensor "A" Circuit Short To Ground (P071011)
DESCRIPTION
The No. 1 ATF temperature sensor converts the fluid temperature into a resistance
value for use by the ECM.
The ECM applies a voltage to the temperature sensor through terminal THO1 of
the ECM.
The sensor resistance changes with the ATF temperature. As the temperature becomes
hi ...
Disassembly
DISASSEMBLY
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
When removing the No. 2 front wheel opening extension pad or No. 1 front
wheel opening extension pad or front wheel opening extension pad, ...
Steering Angle Sensor (C1A47)
DESCRIPTION
The forward recognition camera receives steering angle information from the spiral
cable with sensor sub-assembly. If the forward recognition camera detects a spiral
cable with sensor sub-assembly malfunction, DTC C1A47 is stored.
DTC No.
Detection Item
...