Back Door Entry Unlock Function does not Operate [12/2024 - ]: Procedure

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

   Refer to OPERATION CHECK [12/2024 - ]

   OK

   Back door lock/unlock operate normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REFER TO "POWER DOOR LOCK CONTROL SYSTEM". Refer To  POWER DOOR LOCK CONTROL SYSTEM 

Result: 

OK 

See step  2

1. Check the entry open operation using license plate light assembly with back door opener switch.

   Refer to OPERATION CHECK [12/2024 - ]

2. Check the entry unlock operation using back door control switch (unlock switch).

   Refer to OPERATION CHECK [12/2024 - ]

   Result

   Result	Proceed to
   Only license plate light assembly with back door opener switch does not operate	A
   Only back door control switch (unlock switch) does not operate	B

Result: 

B 

See step  6

Result: 

A 

See step  3

1. Read the Data List according to the display on the GTS.

   Body Electrical > Smart Key > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Trunk Lid/Back Door Unlock Switch	License plate light assembly with back door opener switch (open switch)	OFF or ON	OFF: License plate light assembly with back door opener switch (open switch) not pressed ON: License plate light assembly with back door opener switch (open switch) pressed	Displays whether the license plate light assembly with back door opener switch (unlock switch) is on or off. Use this Data List item to help determine if there is a switch malfunction when the entry back door unlock function does not operate.

   Body Electrical > Smart Key > Data List 

   Tester Display
   Trunk Lid/Back Door Unlock Switch

   OK

   The GTS display changes correctly in response to the operation of the license plate light assembly with back door opener switch.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

Refer to REMOVAL [12/2024 - ]

Result: 

NG 

See step  4

1. Disconnect the K68 certification ECU (smart key ECU assembly) connector.
2. Disconnect the c5 license plate light assembly with back door opener switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K68-16 (TSW5) - c5-3 (UL)	Always	Below 1 Ω
   K68-16 (TSW5) or c5-3 (UL) - Other terminals and body ground	Always	10 kΩ or higher
   c5-4 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

Refer to INSPECTION [12/2024 - ]

Result

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

Refer to REMOVAL [12/2024 - ]

Result: 

NG 

REPLACE LICENSE PLATE LIGHT ASSEMBLY WITH BACK DOOR OPENER SWITCH 

Refer to DISASSEMBLY [12/2024 - ]

1. Read the Data List according to the display on the GTS.

   Body Electrical > Main Body > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Outside Back Door P/W DOWN Switch	Back door control switch (unlock switch)	OFF or ON	OFF: Back door control switch (unlock switch) not pressed ON: Back door control switch (unlock switch) pressed	Displays whether the back door control switch (unlock switch) is on or off. Use this Data List item to help determine if there is a switch malfunction when the entry back door open function does not operate.

   Body Electrical > Main Body > Data List 

   Tester Display
   Outside Back Door P/W DOWN Switch

   OK

   The GTS display changes correctly in response to the operation of the back door control switch (unlock switch).

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

Refer to REMOVAL [12/2024 - ]

Result: 

NG 

See step  7

1. Disconnect the K3 Main body ECU (multiplex network body ECU) connector.
2. Disconnect the c1 back door control switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K3-18 (SDN) - c1-3 (SDN)	Always	Below 1 Ω
   K3-18 (SDN) or c1-3 (SDN) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

Refer to INSPECTION [12/2024 - ]

Result

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

Refer to REMOVAL [12/2024 - ]

Result: 

NG 

REPLACE BACK DOOR CONTROL SWITCH 

Refer to REMOVAL [12/2024 - ]