Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJKH
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Entry Function): All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate; 2016 - 2020 MY Sienna [12/2015 -        ]

All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate

DESCRIPTION

When the entry door lock and unlock functions and wireless door lock and unlock functions do not operate, radio wave interference, or a malfunction in the key or signal circuit between the door control receiver assembly and certification ECU (smart key ECU assembly) is suspected. The signal circuit is shared by the entry function and wireless door lock function.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The smart key system (for entry function) uses a multiplex communication system (LIN communication system) and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting (See page 2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Entry Function): HOW TO PROCEED WITH TROUBLESHOOTING ). Troubleshoot the smart key system (for entry function) after confirming that the communication system is functioning properly.
  • Before performing the inspection, check that DTC B1242 (wireless door lock control) is not output (See page 2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM(w/ Smart Key System): B1242; Wireless Door Lock Tuner Circuit Malfunction ).
  • Confirm that another key is not in the cabin.
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK POWER DOOR LOCK OPERATION

(a) When the door control switch on the master switch assembly is operated, check that the doors unlock and lock according to switch operation (See page 2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM: OPERATION CHECK ).

OK:

Door locks operate normally.

NG

GO TO POWER DOOR LOCK CONTROL SYSTEM (Proceed to Problem Symptoms Table)

OK

2.

CHECK ELECTRICAL KEY TRANSMITTER

(a) Check if another registered key is available.

Result

Proceed to

Another registered key is not available.

A

Another registered key is available.

B
B

GO TO STEP 4

A

3.

REGISTER ELECTRICAL KEY TRANSMITTER

(a) Register a new key (See page 2016 MY Sienna [12/2015 - 08/2016]; THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM(w/ Smart Key System): REGISTRATION 2017 - 2020 MY Sienna [08/2016 -        ]; THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM(w/ Smart Key System): REGISTRATION ).

NEXT

4.

CHECK ELECTRICAL KEY TRANSMITTER (OPERATION)

(a) Using the key registered in the previous step or another registered key, check that the entry function operates normally (See page 2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Entry Function): OPERATION CHECK ).

OK:

Entry function operates normally.

NG

GO TO STEP 7

OK

5.

CHECK ELECTRICAL KEY TRANSMITTER (LED)

(a) Check that the transmitter LED illuminates each time when the switch is pushed 3 times.

Result

Proceed to

Transmitter LED does not illuminate at all when switch is pushed 3 times.

A

Transmitter LED illuminates each time when switch is pushed 3 times.

B

Transmitter LED does not illuminate the second or third time.

C

HINT:

If the transmitter LED does not illuminate the second or third time, replace the transmitter battery because it is depleted.

B

REPLACE ELECTRICAL KEY TRANSMITTER
C

REPLACE TRANSMITTER BATTERY

A

6.

INSPECT TRANSMITTER BATTERY (VOLTAGE)

(a) Remove the battery from the key that does not operate. Attach a lead wire (0.6 mm (0.0236 in.) or less in diameter including wire sheath) with tape or equivalent to the negative (-) terminal (See page 2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: TRANSMITTER BATTERY(w/ Smart Key System): REPLACEMENT ).

NOTICE:

Do not wrap the wire around the terminal, wedge it between the terminals, or solder it. A terminal may be deformed or damaged, and the battery will not be able to be installed correctly.

(b) Carefully pull the lead wire out from the position shown in the illustration and install the previously removed transmitter battery.

(c) Using an oscilloscope, check the transmitter battery voltage waveform.

HINT:

When measuring the battery voltage, while operating the lock switch of a door outside handle assembly, bring the key within the entry operating range to perform the measurement. For the entry operating range, refer to System Description (See page 2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Entry Function): SYSTEM DESCRIPTION ).

Standard Voltage:

Item

Content

Tester Connection

Battery positive (+) - Battery negative (-)

Tool Setting

0.5 V/DIV., 100 ms/DIV.

Condition

Engine switch off, all doors closed and lock switch pushed

Specified Condition

2.2 to 3.2 V (Refer to the waveform)

Text in Illustration

*a

Measurement Position
OK

REPLACE ELECTRICAL KEY TRANSMITTER
NG

REPLACE TRANSMITTER BATTERY

7.

CHECK WAVE ENVIRONMENT

(a) Bring the key near the door control receiver, and check the wireless function.

HINT:

  • When the key is brought near the door control receiver, the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
  • If the inspection result indicates that the problem only occurs in certain locations or times of day, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.

OK:

Wireless function operates normally.

OK

AFFECTED BY WAVE INTERFERENCE
NG

8.

CHECK POWER SOURCE

(a) Check if functions other than the entry function operate when the engine switch is off.

Result

Proceed to

Other functions do not operate.

A

Other functions operate.

B

HINT:

Perform this check with using functions that do not require the engine switch to be on (ACC or IG) in order to operate.

B

GO TO SMART KEY SYSTEM (for Start Function) (Proceed to How to Proceed with Troubleshooting)

A

9.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BATTERY AND BODY GROUND)

(a) Disconnect the certification ECU (smart key ECU assembly) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

D88-1 (+B) - Body ground

Always

11 to 14 V

D88-17 (CUTB) - Body ground

Always

11 to 14 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

D88-15 (E) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Certification ECU (Smart Key ECU Assembly))
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

10.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - DOOR CONTROL RECEIVER)

(a) Disconnect the door control receiver assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D87-5 (RCO) - L27-4 (+5)

Always

Below 1 Ω

D87-15 (RDA) - L27-5 (DATA)

Always

Below 1 Ω

D87-16 (RSSI) - L27-2 (RSSI)

Always

Below 1 Ω

D87-5 (RCO) - Body ground

Always

10 kΩ or higher

D87-15 (RDA) - Body ground

Always

10 kΩ or higher

D87-16 (RSSI) - Body ground

Always

10 kΩ or higher

L27-4 (+5) - Body ground

Always

10 kΩ or higher

L27-5 (DATA) - Body ground

Always

10 kΩ or higher

L27-2 (RSSI) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L27-1 (GND) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Door Control Receiver Assembly)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

INSPECT DOOR CONTROL RECEIVER ASSEMBLY (POWER SOURCE)

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

(b) Reconnect the door control receiver assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

L27-2 (RSSI) - L27-1 (GND)
  • Engine switch off
  • All doors locked
  • Lock or unlock switch on key not pushed

11 to 14 V

L27-2 (RSSI) - L27-1 (GND)
  • Engine switch off
  • All doors locked
  • Lock or unlock switch on key pushed

Below 2 V

L27-5 (DATA) - L27-1 (GND)

Engine switch off

Pulse between 11 to 14 V occurs regularly

Text in Illustration

*a

Component with harness connected

(Door Control Receiver Assembly)
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2018 - 2020 MY Sienna [11/2017 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL )
OK

13.

INSPECT DOOR CONTROL RECEIVER ASSEMBLY (DOOR CONTROL RECEIVER SIGNAL OUTPUT)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

L27-4 (+5) - L27-1 (GND)
  • Engine switch off
  • Lock or unlock switch on key not pushed

Below 1 V

L27-4 (+5) - L27-1 (GND)
  • Engine switch off
  • Lock or unlock switch on key pushed

4.5 to 5.5 V

Text in Illustration

*a

Component with harness connected

(Door Control Receiver Assembly)
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2018 - 2020 MY Sienna [11/2017 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL )
NG

REPLACE DOOR CONTROL RECEIVER ASSEMBLY