Toyota Tacoma (2015-2018) Service Manual: Security Indicator Light Does not Blink

Toyota Tacoma (2015-2018) Service Manual / Engine Immobiliser / Engine Immobiliser System(w/ Smart Key System) / Security Indicator Light Does not Blink

DESCRIPTION

The certification ECU (smart key ECU assembly) blinks the security indicator light when the immobiliser is set (engine switch off, or driver door is opened and closed with engine switch on (IG)).
The certification ECU (smart key ECU assembly) receive the security indicator light signal from the main body ECU (multiplex network body ECU) via CAN communication when the theft deterrent system is arming preparation state or alarm sounding state. Then, certification ECU (smart key ECU assembly) blinks the security indicator light.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the certification ECU (smart key ECU assembly), refer to the Registration (See page ).
The engine immobiliser system (w/ Smart Key System) uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting (See page ). Troubleshoot the engine immobiliser system (w/ Smart Key System) after confirming that the communication systems are functioning properly.

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM (SECURITY INDICATOR LIGHT)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Smart Key / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Smart Key

Tester Display	Test Part	Control Range	Diagnostic Note
Immobiliser Indicator	Security indicator light	OFF/ON	-

OK:

The security indicator light operates normally.

GO TO STEP 3

2.	CHECK SECURITY INDICATOR LIGHT OPERATION

(a) When the immobiliser is set, check that the security indicator light blinks.*1

OK:

The security indicator light blinks normally.

(b) When the theft deterrent system is in the arming preparation state, check that the security indicator light on (See page ).*2 ).*2

OK:

The security indicator light is on normally.

Result

Result	Proceed to
1 is NG (2 is OK)	A
2 is NG (1 is OK)	B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

3.	CHECK HARNESS AND CONNECTOR (SECURITY INDICATOR LIGHT (AIR CONDITIONING CONTROL ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

(a) Disconnect the A33 security indicator light (air conditioning control assembly) connector.

(b) Disconnect the C29 certification ECU (smart key ECU assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A33-6 (LP) - C29-19 (IND)*1	Always	Below 1 Ω
A33-6 (LP) or C29-19 (IND) - Body ground*1	Always	10 kΩ or higher
A33-1 (GND) - Body ground*1	Always	Below 1 Ω
A33-12 (LP) - C29-19 (IND)*2	Always	Below 1 Ω
A33-12 (LP) or C29-19 (IND) - Body ground*2	Always	10 kΩ or higher

*1: for Automatic Air Conditioning System
*2: for Manual Air Conditioning System

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Reconnect the C29 certification ECU (smart key ECU assembly) connector.

(b) Measure the voltage and check the pulse according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A33-6 (LP) - A33-1 (GND)*1	Engine switch off → engine switch on (IG)	Pulse generation → Below 2 V
A33-12 (LP) - A33-1 (GND)*2	Engine switch off → engine switch on (IG)	Pulse generation → Below 2 V

*1: for Automatic Air Conditioning System
*2: for Manual Air Conditioning System

Result

Result	Proceed to
OK (for Automatic Air Conditioning System)	A
OK (for Manual Air Conditioning System)	B
NG	C

REPLACE SECURITY INDICATOR LIGHT (AIR CONDITIONING CONTROL ASSEMBLY)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Short to GND in Immobiliser System Power Source Circuit (B278A)

DESCRIPTION When there is a short to GND in the power supply for the transponder key amplifier of the engine switch, the certification ECU (smart key ECU assembly) stores this DTC. DT ...

Immobiliser System does not Operate Properly

DESCRIPTION The engine immobiliser system compares the ID code that is registered in the certification ECU (smart key ECU assembly) with the ID code of the transponder chip that is embedded in th ...

Other materials:

Lost Communication with ECM (C1437)
DESCRIPTION The skid control ECU (master cylinder solenoid) receives signals from the ECM via the CAN communication system. DTC Code DTC Detection Condition Trouble Area C1437 When the IG1 terminal voltage is 10 V or higher and the veh ...

Precaution
PRECAUTION 1. IGNITION SWITCH EXPRESSION (a) The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this section. Expression Ignition Switch (Position) Engine S ...

Front Occupant Classification Sensor LH Collision Detection (B1785)
DESCRIPTION DTC B1785 is set when the occupant detection ECU receives a collision detection signal, which is sent by the occupant classification sensor front LH when an accident occurs. DTC B1785 is also set when the front seat with adjuster frame assembly RH is subjected to a strong impact, ...