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

DESCRIPTION

When the entry operation and wireless operation of the door lock functions do not operate, a malfunction or wave interference may be occurring in either of the following: 1) the signal communication line between the door control receiver and certification ECU (smart key ECU assembly) (the line used for entry and wireless operations); or 2) the electrical key transmitter sub-assembly. If the entry lock and wireless lock operations cannot be performed, there may be electrical key transmitter sub-assembly malfunctions, wave interference or problems in the communication which is used for the entry and wireless function between the door control receiver and certification ECU (smart key ECU assembly).

WIRING DIAGRAM

INSPECTION PROCEDURE

Note

The smart entry and start system (for Entry Function) uses the CAN communication system and LIN communication system. First inspect the communication systems by following How to Proceed with Troubleshooting Click here. Troubleshoot the smart entry and start system (for Entry Function) after confirming that the communication systems are functioning properly.
When using the intelligent tester with the engine switch off to troubleshoot:

Connect the intelligent tester to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.
Check that there are no electrical key transmitter sub-assemblies in the vehicle.
Before performing the inspection, check that DTC B1242 (wireless door lock control) is not output Click here.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
Before replacing the certification ECU (smart key ECU assembly) or electrical key transmitter sub-assembly, refer to the smart entry and start system (for Entry Function) precaution Click here.
After repair, confirm that no DTCs are output by performing the "DTC Output Confirmation Operation".
The door control receiver has a constant voltage (5 V) supply circuit connected to terminal "+5".

PROCEDURE

INSPECT BATTERY VOLTAGE
1. Measure the voltage of the vehicle battery.
  
  Standard voltage
  
  11 to 14 V
  
  Tech Tips
  
  It may be possible to tell whether the vehicle battery is discharged by operating the horn.
  - If the voltage is below 11 V, recharge or replace the vehicle battery before proceeding.
NEXT
CHECK FOR DTC
1. Open the driver door using the mechanical key built into the electrical key transmitter sub-assembly.
2. Connect the intelligent tester and check for DTCs Click here.
  
  Tech Tips
  
  When using the intelligent tester with the engine switch off to troubleshoot: Connect the intelligent tester to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.
  
  OK
  
  DTC is not output.
NG
GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

OK
CHECK POWER DOOR LOCK CONTROL SYSTEM
1. When the door control switch on the multiplex network master switch assembly on the driver door is operated, check that the doors unlock and lock according to the switch operation Click here.
  
  OK
  
  Door locks operate normally.
NG
GO TO POWER DOOR LOCK CONTROL SYSTEM Click here

OK

Standard voltage
11 to 14 V

OK
DTC is not output.

OK
Door locks operate normally.

CHECK KEY DIAGNOSTIC MODE

Check the following antennas in the key diagnostic mode Click here.

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

Tech Tips

If the buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter cannot be detected by channel 2 due to a malfunction, such as wave interference.

Text in Illustration
*A	for LHD
*B	for RHD
*C	for Type A
*D	for Type B
*a	0.7 to 1 m (2.30 to 3.28 ft.)

Check the electrical key antenna (for driver door) (w/ Driver Door Entry Function):

When the electrical key transmitter sub-assembly is brought within 0.7 to 1 m (2.30 to 3.28 ft.) of the front door outside handle assembly (for driver door), check that the wireless door lock buzzer sounds.

Text in Illustration
*A	for LHD
*B	for RHD
*C	for Type A
*D	for Type B
*a	0.7 to 1 m (2.30 to 3.28 ft.)

Check the electrical key antenna (for front passenger door) (w/ Driver Door Entry Function):

When the electrical key transmitter sub-assembly is brought within 0.7 to 1 m (2.30 to 3.28 ft.) of the front door outside handle assembly (for front passenger door), check that the wireless door lock buzzer sounds.

Text in Illustration
*A	for Type A
*B	for Type B
*a	Inspection Point

Check the No. 1 indoor electrical key antenna (front floor):

When the electrical key transmitter sub-assembly is at the inspection point, check that the wireless door lock buzzer sounds.

Text in Illustration
*A	for Type A
*B	for Type B
*a	Inspection Point

Check the No. 2 indoor electrical key antenna (rear floor):

When the electrical key transmitter sub-assembly is at the inspection point, check that the wireless door lock buzzer sounds.

Text in Illustration
*A	for Type A
*B	for Type B
*a	0.7 to 1 m (2.30 to 3.28 ft.)

Check the electrical key antenna (outside luggage):

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), check that the wireless door lock buzzer sounds.

OK
Wireless door lock buzzer sounds.

Result

Result	Proceed to
Diagnostic mode inspections fail for both channels	A
Diagnostic mode inspections succeed for both channels	B
Diagnostic mode inspection succeeds for only one of the channels	C

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

CHECK WAVE ENVIRONMENT Click here

CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

Check if there are any other registered electrical key transmitter sub-assemblies.

Result

Result	Proceed to
There are no other registered electrical key transmitter sub-assemblies	A
There is another registered electrical key transmitter sub-assemblies	B

CHECK ENTRY DOOR LOCK OPERATION Click here

ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY REGISTRATION (NEW ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY)
1. Register a new electrical key transmitter sub-assembly.
  
  Tech Tips
  
  Refer to the Service Bulletin.
NEXT
CHECK ENTRY DOOR LOCK OPERATION
1. Using another registered electrical key transmitter sub-assembly, check if an entry lock/unlock operation can be performed twice in succession.
  
  OK
  
  Entry lock/unlock operate normally.
NG
CHECK WAVE ENVIRONMENT Click here

OK

OK
Entry lock/unlock operate normally.

CHECK TRANSMITTER BATTERY

Check the transmitter battery level of the electrical key transmitter sub-assembly that was checked first.

Press and hold the lock switch of the transmitter for 5 seconds and check the number of times that the transmitter LED illuminates.

Result

Result	Proceed to
Transmitter LED does not illuminate when switch is pressed and held	A
Transmitter LED illuminates 3 times or more when switch is pressed and held	B
Transmitter LED illuminates once or twice but not a third time	C

Tech Tips

The electrical key transmitter sub-assembly sends voltage information to the certification ECU (smart key ECU assembly) when it is being used. The certification ECU (smart key ECU assembly) displays "Yes" for the "Key Low Battery" item of the Data List when this voltage information indicates 2.2 V or less Click here.
Even if the transmitter battery is depleted, it is still possible to start the engine by holding the electrical key transmitter sub-assembly against the engine switch, depressing the brake pedal and pressing the engine switch.

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

REPLACE TRANSMITTER BATTERY Click here

INSPECT TRANSMITTER BATTERY (VOLTAGE)
1. Inspect the transmitter battery Click here.
NG
REPLACE TRANSMITTER BATTERY Click here

OK

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY
CHECK WAVE ENVIRONMENT
1. Bring the electrical key transmitter sub-assembly near the door control receiver and perform a wireless and entry function operation check.
  Tech Tips
  - When the electrical key transmitter sub-assembly 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 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 electric 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.
  OK
  
  Wireless and entry functions operate normally.
NG
READ VALUE USING INTELLIGENT TESTER (ACC SW, IG SW) Click here

OK

AFFECTED BY WAVE INTERFERENCE

OK
Wireless and entry functions operate normally.

READ VALUE USING INTELLIGENT TESTER (ACC SW, IG SW)

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester on.
Enter the following menus: Body / Main Body / Data List.

Read the Data List according to the display on the intelligent tester.

Main Body
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
ACC SW	Engine switch status / ON or OFF	ON: Engine switch on (ACC) OFF: Engine switch off	-
IG SW	Engine switch status / ON or OFF	ON: Engine switch to ON OFF: Engine switch off	-

TROUBLESHOOT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

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

Text in Illustration

*a
Front view of wire harness connector

(to Certification ECU (Smart Key ECU Assembly))

Disconnect the A43 certification ECU (smart key ECU assembly) connector.

Text in Illustration
*a	Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A43-11 (E) - Body ground	Always	Below 1 Ω

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

Standard Voltage

Tester Connection	Condition	Specified Condition
A43-10 (CUTB) - Body ground	Always	11 to 14 V
A43-2 (+B) - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the O1 certification ECU (smart key ECU assembly) connector.
Disconnect the O45 door control receiver connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
O1-5 (RCO) - O45-4 (+5)	Always	Below 1 Ω
O1-17 (RDAM) - O45-5 (DATA)	Always	Below 1 Ω
O1-6 (CSEL) - O45-2 (CSEL)	Always	Below 1 Ω
O1-5 (RCO) or O45-4 (+5) - Body ground	Always	10 kΩ or higher
O1-17 (RDAM) or O45-5 (DATA) - Body ground	Always	10 kΩ or higher
O1-6 (CSEL) or O45-2 (CSEL) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK DOOR CONTROL RECEIVER

Text in Illustration

*a
Component with harness connected

(Door Control Receiver)

Connect the O45 door control receiver connector.
Connect the A43 certification ECU (smart key ECU assembly) connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
O45-1 (GND) - Body ground	Always	Below 1 Ω

REPLACE DOOR CONTROL RECEIVER Click here

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Connect the A43 certification ECU (smart key ECU assembly) connector.
Connect the O45 door control receiver connector.

Text in Illustration
*a	Component with harness connected (Door Control Receiver)

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

Standard Voltage

Tester Connection

Condition

Specified Condition

O45-4 (+5) - O45-1 (GND)

Procedure:

Engine switch off
Electrical key transmitter sub-assembly switch not pressed

Below 1 V

Procedure:

Engine switch off
Electrical key transmitter sub-assembly switch pressed

4.5 to 5.5 V

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

CHECK DOOR CONTROL RECEIVER

Connect the A43 certification ECU (smart key ECU assembly) connector.
Connect the O45 door control receiver connector.

Text in Illustration
*a	Component with harness connected (Door Control Receiver)

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

Standard Voltage

Tester Connection

Condition

Specified Condition

O45-5 (DATA) - O45-1 (GND)

Procedure:

All doors closed
All doors locked
Electrical key transmitter sub-assembly switch pressed

Below 1 V → 11 to 14 V → Below 1 V

O45-2 (CSEL) - O45-1 (GND)

Procedure:

Engine switch off
All doors closed

Below 1 V → 4.4 to 6.5 V → Below 1 V

REPLACE DOOR CONTROL RECEIVER Click here

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
1. Temporarily replace the certification ECU (smart key ECU assembly) with a new one.
  
  Tech Tips
  
  Refer to the Service Bulletin.
NEXT
CHECK WIRELESS DOOR LOCK CONTROL SYSTEM
1. Check that the wireless door lock functions operate normally Click here.
  
  OK
  
  Wireless door lock functions operate normally.
NG
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

OK

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)
CHECK WAVE ENVIRONMENT
1. Bring the electrical key transmitter sub-assembly that was checked first near the door control receiver and select the failed channel (the channel in which the buzzer did not sound) to recheck the key diagnostic mode Click here.
  Tech Tips
  - When the electrical key transmitter sub-assembly 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 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 electric 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.
  OK
  
  Wireless door lock buzzer sounds.
NG
CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY Click here

OK

AFFECTED BY WAVE INTERFERENCE

CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

Check if there are any other registered electrical key transmitter sub-assemblies.

Result

Result	Proceed to
There are no other registered electrical key transmitter sub-assemblies	A
There is another registered electrical key transmitter sub-assemblies	B

CHECK WAVE ENVIRONMENT Click here

ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY REGISTRATION (NEW ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY)
1. Register a new electrical key transmitter sub-assembly.
  
  Tech Tips
  
  Refer to the Service Bulletin.
NEXT
CHECK WAVE ENVIRONMENT
1. Bring another registered electrical key transmitter sub-assembly near the door control receiver and select the failed channel (the channel in which the buzzer did not sound) to recheck the key diagnostic mode Click here.
  Tech Tips
  - When the electrical key transmitter sub-assembly 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 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 electric 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.
  OK
  
  Wireless door lock buzzer sounds.
NG
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - DOOR CONTROL RECEIVER) Click here

OK

END (ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY WAS DEFECTIVE)

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

Disconnect the O1 certification ECU (smart key ECU assembly) connector.
Disconnect the O45 door control receiver connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
O1-6 (CSEL) - O45-2 (CSEL)	Always	Below 1 Ω
O1-6 (CSEL) or O45-2 (CSEL) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Connect the A43 certification ECU (smart key ECU assembly) connector.
Connect the O45 door control receiver connector.

Text in Illustration
*a	Component with harness connected (Door Control Receiver)

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

Standard Voltage

Tester Connection	Condition	Specified Condition
O45-2 (CSEL) - O45-1 (GND)	Engine switch off and all doors closed	Below 1 V → 4.4 to 6.5 V → Below 1 V

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

CHECK DOOR CONTROL RECEIVER

Connect the A43 certification ECU (smart key ECU assembly) connector.
Connect the O45 door control receiver connector.

Text in Illustration
*a	Component with harness connected (Door Control Receiver)

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

Tech Tips

Inspection should be performed while the electrical key antenna check in key diagnostic mode is being performed on the failed channel (the channel in which the buzzer did not sound).

Standard Voltage

Tester Connection

Condition

Specified Condition

O45-5 (DATA) - O45-1 (GND)

Procedure:

All doors closed
All doors locked
Electrical key transmitter sub-assembly switch pressed*

Below 1 V → 11 to 14 V → Below 1 V

*: While the electrical key antennas are being inspected in key diagnostic mode Click here.

REPLACE DOOR CONTROL RECEIVER Click here

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
1. Temporarily replace the certification ECU (smart key ECU assembly) with a new one.
  
  Tech Tips
  
  Refer to the Service Bulletin.
NEXT
CHECK WIRELESS DOOR LOCK CONTROL SYSTEM
1. Check that the wireless door lock functions operate normally Click here.
  
  OK
  
  Wireless door lock functions operate normally.
NG
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

OK

END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)