Toyota Tacoma manuals

Toyota Tacoma (2015-2018) Service Manual: Entry Exterior Alarm and Answer-back Buzzer do not Sound

Toyota Tacoma (2015-2018) Service Manual / Door Lock / Smart Key System(for Entry Function) / Entry Exterior Alarm and Answer-back Buzzer do not Sound

DESCRIPTION

The smart key system (for Entry Function) uses the wireless door lock buzzer to perform various vehicle exterior warnings. When the conditions of each warning are met, the certification ECU (smart key ECU assembly) sends a buzzer activation request signal to the main body ECU (multiplex network body ECU) via CAN communication and the buzzer sounds.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

  • The smart key system (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Entry Function) after confirming that the communication systems are functioning properly (See page When using the Techstream with the engine switch off, connect the Techstream ).
  • When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • Before replacing the certification ECU (smart key ECU assembly) or main body ECU (multiplex network body ECU), refer to smart key system (for Entry Function) (See page After repair, confirm that no DTCs are output by performing "DTC Output ).
  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.

CHECK CUSTOMIZE SETTING (WIRELESS BUZZER RESP)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Customize Setting / Wireless Door Lock.

Wireless Door Lock

Tester Display

Default

Description

Setting

ECU

Wireless Buzzer Resp

ON

Wireless buzzer response

OFF or ON

Main body ECU (multiplex network body ECU)
Result

Result

Proceed to

"ON" is displayed

A

"OFF" is displayed

B
B

PERFORM CUSTOMIZE SETTING
A

2.

CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

(a) Check that the wireless door lock functions operate normally (See page Result ).

Result

Result

Proceed to

Wireless door lock function does not operate normally

A

Wireless door lock function operates normally

B
B

GO TO PROBLEM SYMPTOMS TABLE

A

3.

READ VALUE USING TECHSTREAM (EACH UNLOCK DETECTION SWITCH)

(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 / 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

FR Door Lock Pos

Front door RH unlock detection switch signal / UNLOCK or LOCK

UNLOCK: Front door RH unlocked

LOCK: Front door RH locked

-

FL Door Lock Pos

Front door LH unlock detection switch signal / UNLOCK or LOCK

UNLOCK: Front door LH unlocked

LOCK: Front door LH locked

-

RR-Door Lock Pos SW*1

Rear door RH unlock detection switch signal / ON or OFF

ON: Rear door RH or LH unlocked

OFF: Rear door RH and LH locked

-

RL-Door Lock Pos SW*1

Rear door LH unlock detection switch signal / ON or OFF

ON: Rear door RH or LH unlocked

OFF: Rear door RH and LH locked

-
  • *1: for Double Cab

OK:

The Techstream display changes correctly in response to the lock/unlock operation.

NG

GO TO LIGHTING SYSTEM (PROCEED TO DOOR UNLOCK DETECTION SWITCH CIRCUIT)

OK

4.

PERFORM ACTIVE TEST USING TECHSTREAM (WIRELESS BUZZER)

(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 / Main Body / Active Test.

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

Main Body

Tester Display

Measurement Item

Control Range

Diagnostic Note

Wireless Buzzer

Wireless door lock buzzer

OFF/ON

-
Result

Result

Proceed to

Wireless buzzer does not sound

A

Wireless buzzer sounds

B
B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

A

5.

INSPECT WIRELESS DOOR LOCK BUZZER

(a) Disconnect the wireless door lock buzzer connector.

(b) Perform the Active Test using the Techstream and sound the wireless door lock buzzer.

Main Body

Tester Display

Measurement Item

Control Range

Diagnostic Note

Wireless Buzzer

Wireless door lock buzzer

OFF/ON

-

(c) While performing the Active Test, measure the voltage between the terminals of the wireless door lock buzzer.

Standard Voltage:

Tester Connection

Condition

Specified Condition

W3-1 - W3-2

Active Test Wireless Buzzer ON

Pulse generation (frequency: 2 kHz, high voltage: 11 to 14 V, low voltage: below 1 V)

Active Test Wireless Buzzer OFF

Below 1 V
Text in Illustration

*a

Front view of wire harness connector

(to Wireless Door Lock Buzzer)
OK

REPLACE WIRELESS DOOR LOCK BUZZER

NG

6.

CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Remove the main body ECU (multiplex network body ECU) from the driver side junction block (See page (b) Reconnect the 1F driver side junction block connector. ).

(b) Reconnect the 1F driver side junction block connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W3-1 - MB-21 (BZR)

Always

Below 1 Ω

W3-2 - Body ground

Always

Below 1 Ω

W3-1 or MB-21 (BZR) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

7.

CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - DRIVER SIDE JUNCTION BLOCK)

(a) Disconnect the 1F driver side junction block connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W3-1 - 1F-29

Always

Below 1 Ω

W3-1 or 1F-29 - Body ground

Always

10 kΩ or higher
OK

REPLACE DRIVER SIDE JUNCTION BLOCK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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