Toyota Tacoma manuals

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

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

DESCRIPTION

  • The transponder key ECU assembly blinks the security indicator light when the immobiliser is set (no key is in the ignition key cylinder).
  • w/ Theft Deterrent System:

    The main body ECU (multiplex network body ECU) blinks the security indicator light when the theft deterrent system is in the arming preparation state or alarm sounding state.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

If the transponder key ECU assembly is replaced, refer to Registration (See page PROCEDURE ).

PROCEDURE

1.

SYSTEM CHECK

(a) Check the vehicle specification.

Result

Result

Proceed to

w/o Theft Deterrent System

A

w/ Theft Deterrent System

B
B

GO TO STEP 5

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM

(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 / Immobiliser / Active Test.

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

Immobiliser

Tester Display

Test Part

Control Range

Diagnostic Note

Security Indicator

Security indicator light

ON/OFF

-

OK:

The security indicator light operates normally by using the Active Test.

OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY

NG

3.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - TRANSPONDER KEY ECU ASSEMBLY)

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

(b) Disconnect the T10 transponder key ECU assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T10-8 (IND) - A33-6 (LP)*1

Always

Below 1 Ω

T10-8 (IND) or A33-6 (LP) - Body ground*1

Always

10 kΩ or higher

A33-1 (GND) - Body ground

Always

Below 1 Ω

T10-8 (IND) - A33-12 (LP)*2

Always

Below 1 Ω

T10-8 (IND) or A33-12 (LP) - 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 TRANSPONDER KEY ECU ASSEMBLY

(a) Reconnect the T10 transponder 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) - Body ground*1

No key in ignition key cylinder (engine immobiliser system set)

Pulse generation

A33-6 (LP) - Body ground*1

Key in ignition key cylinder (engine immobiliser system unset)

Below 1 V

A33-12 (LP) - Body ground*2

No key in ignition key cylinder (engine immobiliser system set)

Pulse generation

A33-12 (LP) - Body ground*2

Key in ignition key cylinder (engine immobiliser system unset)

Below 1 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 TRANSPONDER KEY ECU ASSEMBLY

5.

PERFORM ACTIVE TEST USING TECHSTREAM (SECURITY INDICATOR LIGHT)

(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 / Immobiliser or Main Body / Active Test.

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

Immobiliser

Tester Display

Test Part

Control Range

Diagnostic Note

Security Indicator

Security indicator light

ON/OFF

-
Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Security Indicator

Security indicator light

OFF/ON

-
Result

Result

Proceed to

Security indicator light operation is normal when performing the "Main Body" and "Immobiliser" Active Test

A
  • Security indicator light operation is not normal when performing the "Immobiliser" Active Test
  • Security indicator light operation is normal when performing the "Main Body" Active Test

B
  • Security indicator light operation is normal when performing the "Immobiliser" Active Test
  • Security indicator light operation is not normal when performing the "Main Body" Active Test

C

Security indicator light operation is not normal when performing the "Main Body" and "Immobiliser" Active Test

D
B

GO TO STEP 7

C

GO TO STEP 8

D

GO TO STEP 9

A

6.

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

Both *1 and *2 are OK

A

*1 is NG (*2 is OK)

B

*2 is NG (*1 is OK)

C

Both *1 and *2 are NG (for Automatic Air Conditioning System)

D

Both *1 and *2 are NG (for Manual Air Conditioning System)

E
A

USE SIMULATION METHOD TO CHECK

B

REPLACE TRANSPONDER KEY ECU ASSEMBLY

C

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

D

REPLACE SECURITY INDICATOR LIGHT (AIR CONDITIONING CONTROL ASSEMBLY)

E

REPLACE SECURITY INDICATOR LIGHT (AIR CONDITIONING CONTROL ASSEMBLY)

7.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - TRANSPONDER KEY ECU ASSEMBLY)

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

(b) Disconnect the T10 transponder key ECU assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T10-8 (IND) - A33-6 (LP)*1

Always

Below 1 Ω

T10-8 (IND) or A33-6 (LP) - Body ground*1

Always

10 kΩ or higher

T10-8 (IND) - A33-12 (LP)*2

Always

Below 1 Ω

T10-8 (IND) or A33-12 (LP) - Body ground*2

Always

10 kΩ or higher
  • *1: for Automatic Air Conditioning System
  • *2: for Manual Air Conditioning System
OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

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

(b) Disconnect the M6 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M6-15 (IND) - A33-6 (LP)*1

Always

Below 1 Ω

M6-15 (IND) or A33-6 (LP) - Body ground*1

Always

10 kΩ or higher

M6-15 (IND) - A33-12 (LP)*2

Always

Below 1 Ω

M6-15 (IND) or A33-12 (LP) - Body ground*2

Always

10 kΩ or higher
  • *1: for Automatic Air Conditioning System
  • *2: for Manual Air Conditioning System
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) OR TRANSPONDER KEY ECU ASSEMBLY)

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

(b) Disconnect the T10 transponder key ECU assembly connector.

(c) Disconnect the M6 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T10-8 (IND) - A33-6 (LP)*1

Always

Below 1 Ω

M6-15 (IND) - A33-6 (LP)*1

Always

Below 1 Ω

A33-1 (GND) - Body ground

Always

Below 1 Ω

T10-8 (IND) or A33-6 (LP) - Body ground*1

Always

10 kΩ or higher

M6-15 (IND) or A33-6 (LP) - Body ground*1

Always

10 kΩ or higher

T10-8 (IND) - A33-12 (LP)*2

Always

Below 1 Ω

M6-15 (IND) - A33-12 (LP)*2

Always

Below 1 Ω

T10-8 (IND) or A33-12 (LP) - Body ground*2

Always

10 kΩ or higher

M6-15 (IND) or A33-12 (LP) - 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

10.

REPLACE SECURITY INDICATOR LIGHT (AIR CONDITIONING CONTROL ASSEMBLY)

(a) Temporarily replace the security indicator light (air conditioning control assembly) with a new or known good one (See page (b) Temporarily replace the security indicator light (air conditioning control (b) Temporarily replace the security indicator light (air conditioning control ).*1

(b) Temporarily replace the security indicator light (air conditioning control assembly) with a new or known good one (See page (c) When the immobiliser is set or theft deterrent system is in the arming preparation (c) When the immobiliser is set or theft deterrent system is in the arming preparation ).*2

(c) When the immobiliser is set or theft deterrent system is in the arming preparation state, check that the security indicator light blinks.

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

OK:

Security indicator light blinks.

OK

END (SECURITY INDICATOR LIGHT (AIR CONDITIONING CONTROL ASSEMBLY) WAS DEFECTIVE)
NG

11.

REPLACE TRANSPONDER KEY ECU ASSEMBLY

(a) Replace the transponder key ECU assembly with a new one (See page (b) When the immobiliser is set or theft deterrent system is in the arming preparation ).

(b) When the immobiliser is set or theft deterrent system is in the arming preparation state, check that the security indicator light blinks.

OK:

Security indicator light blinks.

OK

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)
NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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