SMART ENTRY AND START SYSTEM (for Entry Function) Back Door Entry Lock and Unlock Functions do not Operate

DESCRIPTION

When the back door entry lock and unlock functions do not operate, one of the following may be malfunctioning: 1) power door lock control system; 2) outside electrical key oscillator (for rear side); 3) certification ECU (smart key ECU assembly), or 4) back door opener switch assembly.

WIRING DIAGRAM

INSPECTION PROCEDURE

Note

The smart entry and start 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 Click here. Troubleshoot the smart entry and start system (for entry function) after confirming that the communication system is functioning properly.
Confirm that another key is not in the cabin.
Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.

PROCEDURE

CHECK POWER DOOR LOCK OPERATION
1. When the door control switch on the master switch assembly is operated, check that the doors unlock and lock according to switch operation Click here.
  
  OK
  
  Door locks operate normally.
NG
GO TO POWER DOOR LOCK CONTROL SYSTEM (Proceed to Problem Symptoms Table) Click here

OK

OK
Door locks operate normally.

READ VALUE USING GTS (TR/B-DOOR LOCK SW, TR/B-DOOR UNLOCK SW)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Body Electrical / Entry&Start / Data List.

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

Entry&Start (Certification ECU (Smart Key ECU Assembly))
Tester Display	Measurement Item/Display	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) pushed OFF: Back door opener switch assembly (lock switch) not pushed	-
Tr/B-Door Unlock SW	Back door opener switch assembly (opener switch) / ON or OFF	ON: Back door opener switch assembly (opener switch) pushed OFF: Back door opener switch assembly (opener switch) not pushed	-

OK
On the GTS screen, the display changes between ON and OFF as shown in the chart above.

CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH - BODY GROUND) Click here

CHECK WAVE ENVIRONMENT
1. Bring the key near the outside electrical key oscillator (for rear side), and perform an entry back door open and entry lock functions check.
  
  Note
  
  If the key is brought within 0.2 m (0.656 ft.) of the rear bumper, communication is not possible.
  Tech Tips
  
  When the key is brought near the outside electrical key oscillator (for rear side), the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
  
  If the operation is normal, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation.
  OK
  
  Entry functions operate normally.
NG
PERFORM KEY DIAGNOSTIC MODE INSPECTION Click here

OK

AFFECTED BY WAVE INTERFERENCE
PERFORM KEY DIAGNOSTIC MODE INSPECTION
1. Diagnostic mode inspection (outside electrical key oscillator (for rear side))
  1. Connect the GTS to the DLC3.
  2. Turn the engine switch on (IG).
  3. Turn the GTS on.
  4. Enter the following menus: Body Electrical / Entry&Start / Utility / Communication Check (Key Diag Mode) / Overhead + Back Door.
  5. When the key is held at the same height as the rear bumper upper surface and aligned with the center of the rear of the vehicle, check that the wireless door lock buzzer sounds.
    
    Tech Tips
    
    If the buzzer sounds, it can be determined that the outside electrical key oscillator (for rear side) is operating normally.
    
    OK
    
    Wireless door lock buzzer sounds.
NG
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - OUTSIDE ELECTRICAL KEY OSCILLATOR) Click here

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK
Entry functions operate normally.

OK
Wireless door lock buzzer sounds.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - OUTSIDE ELECTRICAL KEY OSCILLATOR)

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

Text in Illustration
*1	Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))
*2	Front view of wire harness connector (to Outside Electrical Key Oscillator (for Rear Side))

Disconnect the outside electrical key oscillator (for rear side) connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
D26-19 (CLG8) - L17-1 (CLG5)	Always	Below 1 Ω
D26-20 (CG8B) - L17-2 (CLGB)	Always	Below 1 Ω
D26-19 (CLG8) - Body ground	Always	10 kΩ or higher
D26-20 (CG8B) - Body ground	Always	10 kΩ or higher
L17-1 (CLG5) - Body ground	Always	10 kΩ or higher
L17-2 (CLGB) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT OUTSIDE ELECTRICAL KEY OSCILLATOR (for Rear Side)

Text in Illustration
*1	Component without harness connected (Outside Electrical Key Oscillator (for Rear Side))

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

Standard Resistance

Tester Connection	Condition	Specified Condition
L17-1 (CLG5) - L17-2 (CLGB)	Always	Below 1 Ω

REPLACE OUTSIDE ELECTRICAL KEY OSCILLATOR (for Rear Side) Click here

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH - BODY GROUND)

Text in Illustration

*1
Front view of wire harness connector

(to Back Door Opener Switch Assembly))

Disconnect the back door opener switch assembly connector.

Text in Illustration
*1	Front view of wire harness connector (to Back Door Opener Switch Assembly))

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

Standard Resistance

Tester Connection	Condition	Specified Condition
R13-2 (E) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE BACK DOOR OPENER SWITCH ASSEMBLY Click here