Back Door Entry Lock and Unlock Functions do not Operate [10/2014 - 01/2019]: Procedure

1. When the door control switch on the multiplex network master switch assembly is operated, check that the doors unlock and lock according to the switch operation.

   Refer to OPERATION CHECK [10/2014 - ]

   OK

   Door locks operate normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO POWER DOOR LOCK CONTROL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - ] 

Result: 

OK 

See step  2

1. Check for DTCs.

   Body Electrical > Smart Access > Trouble Codes 

   Result

   Result	Proceed to
   DTC B27A8 is not output	A
   DTC B27A8 is output	B

Result: 

B 

GO TO OTHER DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2014 - ] 

Result: 

A 

See step  3

1. Bring the electrical key transmitter sub-assembly approximately 0.3 m (0.984 ft.) from the electrical key antenna (outside luggage compartment) and perform an entry back door open/lock function check.

   Refer to OPERATION CHECK [10/2014 - 09/2017] , or refer to OPERATION CHECK [09/2017 - ]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Approximately 0.3 m (0.984 ft.)

   HINT: 

   • Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the electrical key antenna (outside luggage compartment)
   • When the electrical key transmitter sub-assembly is brought near the electrical key antenna (outside luggage compartment), the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
   • If the inspection result is that the problem only occurs in certain locations or at certain 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.
   • There may be wave interference if the vehicle is near broadcasting antennas, large video displays, wireless garage door opener systems, wireless security cameras, home security systems, etc. In this case, move the vehicle to a different location and check if there is any improvement.
   • If a tool for checking radio waves, such as a signal strength meter, is available, move around the area while observing both the LF band (used by the vehicle antenna to form the detection area) and RF band (used by the electrical key transmitter sub-assembly for transmission) to check for locations where there is wave interference.
   • When checking the operation of the entry lock function several times, it can be operated up to 2 times consecutively. To operate the function 3 times or more consecutively, the doors need to be unlocked once. However, this is only for the entry lock function, other door lock operations, such as a wireless door lock operation can be performed consecutively.

   Result

   Result	Proceed to
   Entry function does not operate normally	A
   Entry function operates normally	B

Result: 

B 

AFFECTED BY WAVE INTERFERENCE 

Result: 

A 

See step  4

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Smart Access / Data List.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Smart Access > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Tr/B-Door Lock SW	Back door opener switch assembly (lock switch)	ON or OFF	ON: Back door opener switch assembly (lock switch) pressed OFF: Back door opener switch assembly (lock switch) not pressed	Displays whether the back door opener switch assembly (lock switch) is on or off. Use this Data List item to help determine if there is a switch malfunction when the back door lock function does not operate.
   Tr/B-Door Unlock SW	Back door opener switch assembly (open switch)	ON or OFF	ON: Back door opener switch assembly (open switch) pressed OFF: Back door opener switch assembly (open switch) not pressed	Displays whether the back door opener switch assembly (open switch) is on or off. Use this Data List item to help determine if there is a switch malfunction when the back door open function does not operate.

   Body Electrical > Smart Access > Data List 

   Tester Display
   Tr/B-Door Lock SW
   Tr/B-Door Unlock SW

   OK

   The Techstream display changes correctly in response to the operation of the back door opener switch assembly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  9

Result: 

OK 

See step  5

1. Check the following antenna in key diagnostic mode.

   Body Electrical > Smart Access > Utility 

   Tester Display
   Communication Check (Key Diag Mode)

2. Select either channel 1 or channel 2 and perform the key diagnostic mode inspection for each channel.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	0.7 to 1 m (2.30 to 3.28 ft.)

   1. Check the electrical key antenna (outside luggage compartment):

      When the electrical key transmitter sub-assembly is brought within 0.7 to 1 m (2.30 to 3.28 ft.) of the electrical key antenna (outside luggage compartment), check that the wireless buzzer sounds.

      HINT: 

      • Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel.
      • If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

   Result

   Result	Proceed to
   Wireless buzzer does not sound	A
   Wireless buzzer sounds	B

Result: 

B 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2014 - ] 

Result: 

A 

See step  6

1. Disconnect the X2 electrical key antenna (outside luggage compartment) connector.
2. Disconnect the I52 certification ECU (smart key ECU assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   X2-2 (ANTE8) - I52-2 (CLG8)	Always	Below 1 Ω
   X2-1 (CLGB) - I52-1 (CG8B)	Always	Below 1 Ω
   X2-2 (ANTE8) or I52-2 (CLG8) - Body ground	Always	10 kΩ or higher
   X2-1 (CLGB) or I52-1 (CG8B) - Body ground	Always	10 kΩ or higher

4. Connect the I52 certification ECU (smart key ECU assembly) connector.
5. Disconnect the X2 electrical key antenna (outside luggage compartment) connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component with harness connected (Certification ECU (Smart Key ECU Assembly))

   *b

   Waveform 1

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   I52-2 (CLG8) - I53-11 (E)	Procedure: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Back door opener switch assembly off → on	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 1)
   I52-1 (CG8B) - I53-11 (E)	Procedure: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Back door opener switch assembly off → on	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 1)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT). Refer to  REMOVAL [10/2014 - ] 

Result: 

NG 

See step  8

1. Connect all connectors and check that the entry lock and unlock functions operate.

   Refer to OPERATION CHECK [10/2014 - 09/2017] , or refer to OPERATION CHECK [09/2017 - ]

   Result

   Result	Proceed to
   Entry function does not operate normally	A
   Entry function operates normally	B

Result: 

A 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2014 - ] 

Result: 

B 

END (CONNECTOR WAS NOT CONNECTED SECURELY) 

1. Disconnect the Y7 back door opener switch assembly connector.
2. Disconnect the I52 certification ECU (smart key ECU assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Y7-1 (L) - I52-13 (TSW6)	Always	Below 1 Ω
   Y7-3 (UL) - I52-5 (TSW5)	Always	Below 1 Ω
   Y7-2 (E) - Body ground	Always	Below 1 Ω
   Y7-1 (L) or I52-13 (TSW6) - Body ground	Always	10 kΩ or higher
   Y7-3 (UL) or I52-5 (TSW5) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  10

1. Remove the back door opener switch assembly.

   Refer to REMOVAL [10/2014 - ]

2. Inspect the back door opener switch assembly.

   Refer to INSPECTION [10/2014 - 01/2019]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BACK DOOR OPENER SWITCH ASSEMBLY. Refer to  REMOVAL [10/2014 - ] 

Result: 

OK 

See step  11

1. Connect all connectors and check that the entry lock and unlock functions operate.

   Refer to OPERATION CHECK [10/2014 - 09/2017] , or refer to OPERATION CHECK [09/2017 - ]

   Result

   Result	Proceed to
   Entry function does not operate normally	A
   Entry function operates normally	B

Result: 

A 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2014 - ] 

Result: 

B 

END (CONNECTOR WAS NOT CONNECTED SECURELY)