Toyota Tacoma manuals

Toyota Tacoma (2015-2018) Service Manual: 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

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 ).
  • 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 the engine immobiliser system (w/ Smart Key System) after confirming that ). 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).

(c) Turn the Techstream on.

(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.

NG

GO TO STEP 3

OK

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

A

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

B

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.

(c) Measure the resistance according to the value(s) in the table below.

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
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

A

REPLACE SECURITY INDICATOR LIGHT (AIR CONDITIONING CONTROL ASSEMBLY)

B

REPLACE SECURITY INDICATOR LIGHT (AIR CONDITIONING CONTROL ASSEMBLY)

C

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:

Terminals Of Ecu
TERMINALS OF ECU 1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND DRIVER SIDE JUNCTION BLOCK (a) Remove the main body ECU (multiplex network body ECU) from the driver side junction block (See page ). (b) Disconnect the 1D driver side junction block connector. (c) Measure the voltag ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals ...

Brake System (P157800)
DESCRIPTION This DTC is stored when a malfunction is detected in the vehicle stability control system. DTC No. Detection Item DTC Detection Condition Trouble Area MIL P157800 Brake System While the igni ...

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