Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJH2
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM(w/ Smart Key System): No Answer-Back; 2016 - 2020 MY Sienna [12/2015 -        ]

No Answer-Back

DESCRIPTION

In some cases, wireless door lock control functions are normal but the hazard warning light and/or wireless door lock buzzer answer-back function(s) does not operate. In such cases, the main body ECU hazard warning light and wireless door lock buzzer signal outputs may be malfunctioning.

NOTICE:

Troubleshooting should be started after confirming that the customize status of the answer-back function has been switched ON.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before performing the inspection, check that there are no problems related to the CAN communication system.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (DOOR LOCK POSITION 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 (Main Body ECU)

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

FR Door Lock Pos

Front RH side door lock position switch signal / UNLOCK or LOCK

UNLOCK: Front RH side door unlocked

LOCK: Front RH side door locked

-

FL Door Lock Pos

Front LH side door lock position switch signal / UNLOCK or LOCK

UNLOCK: Front LH side door unlocked

LOCK: Front LH side door locked

-

RR-Door Lock Pos SW

Rear RH side door lock position switch signal / ON or OFF

ON: Rear RH side rear door unlocked

OFF: Rear RH side rear door locked

-

RL-Door Lock Pos SW

Rear LH side door lock position switch signal / ON or OFF

ON: Rear LH side rear door unlocked

OFF: Rear LH side rear door locked

-

OK:

The Techstream should display as shown in the table according to door lock operation.

NG

GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit)

OK

2.

CHECK WIRELESS DOOR LOCK CONTROL FUNCTION

(a) Check the wireless door lock control functions by operating the transmitter switch.

Result

Result

Proceed to

Wireless door lock functions are normal but hazard warning lights answer-back does not occur

A

Wireless door lock functions are normal but wireless door lock buzzer answer-back does not occur

B

Doors cannot be locked and unlocked with transmitter

C
B

GO TO STEP 4

C

GO TO PROBLEM SYMPTOMS TABLE

A

3.

CHECK HAZARD WARNING LIGHT

(a) Select the Active Test, use the Techstream to generate a control command, and then check that the hazard warning lights flash.

OK:

Hazard warning lights flash continuously.

OK

REPLACE MAIN BODY ECU

NG

GO TO LIGHTING SYSTEM

4.

PERFORM ACTIVE TEST USING TECHSTREAM (WIRELESS DOOR LOCK BUZZER)

(a) Select the Active Test, use the Techstream to generate a control command, and then check that the wireless buzzer operates normally.

Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Wireless Buzzer

Wireless Door Lock Buzzer

ON/OFF

-

OK:

Wireless buzzer turns ON/OFF.

OK

REPLACE MAIN BODY ECU

NG

5.

CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)

(a) Disconnect the wireless door lock buzzer connector.

(b) Disconnect the instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A19-2 - 2F-20 (BZR)

Always

Below 1 Ω

A19-1 - Body ground

Always

A19-2 or 2F-20 (BZR) - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to Wireless Door Lock Buzzer)

*b

Front view of wire harness connector

(to Instrument Panel Junction Block Assembly)

(d) Reconnect the wireless door lock buzzer and instrument panel junction block assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly (See page 2016 - 2020 MY Sienna [12/2015 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL ).

Text in Illustration

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2F-20 (BZR) - 2I-21 (BZR)

Always

Below 1 Ω
NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

OK

7.

REPLACE WIRELESS DOOR LOCK BUZZER

(a) Temporarily replace the wireless door lock buzzer with a new or normally functioning one (See page 2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: WIRELESS DOOR LOCK BUZZER: REMOVAL ).

NEXT

8.

INSPECT WIRELESS DOOR LOCK BUZZER OPERATION

(a) Check the operation of the wireless answer-back function.

OK:

Wireless answer-back function operation normally.

OK

END (WIRELESS DOOR LOCK BUZZER IS DEFECTIVE)
NG

REPLACE MAIN BODY ECU