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

DESCRIPTION

If the entry lock and unlock functions do not operate for the rear door LH only, the request code may not be being transmitted from the rear door LH or the rear door outside handle assembly LH (touch sensor) may be malfunctioning. If the entry functions for other doors operate properly, communication between the electrical key transmitter sub-assembly and door control receiver is normal. In this case, there may be a problem with request code transmission (communication between the certification ECU (smart key ECU assembly) and rear door outside handle assembly LH (electrical key antenna)), or there may be wave interference.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Note

The entry and start system (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Entry Function) after confirming that the communication systems are functioning properly.

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When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
Check that there are no electrical key transmitter sub-assemblies in the vehicle.
Before replacing the certification ECU (smart key ECU assembly), refer to entry and start system (for Entry Function) Precaution.

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After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

CHECK POWER DOOR LOCK CONTROL SYSTEM

When the door control switch on the power window regulator master switch assembly is operated, check that the doors unlock and lock according to the switch operation.

Click here

OK
Door locks operate normally.

Result

Proceed to
OK
NG

GO TO POWER DOOR LOCK CONTROL SYSTEM Click here

CHECK FOR DTC

Check for DTCs.

Body Electrical > Entry&Start > Trouble Codes

Result

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

CHECK WAVE ENVIRONMENT

*a	Approximately 0.3 m (0.984 ft.)

Bring the electrical key transmitter sub-assembly approximately 0.3 m (0.984 ft.) from the rear door outside handle assembly LH and perform an entry function check.

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Tech Tips

Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the rear door outside handle assembly LH.
When the electrical key transmitter sub-assembly is brought near the rear door outside handle assembly LH, 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

AFFECTED BY WAVE INTERFERENCE

CHECK HARNESS AND CONNECTOR (REAR DOOR OUTSIDE HANDLE ASSEMBLY LH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) AND BODY GROUND)

Disconnect the Q3 rear door outside handle assembly LH connector.
Disconnect the T1*1 or U1*2 certification ECU (smart key ECU assembly) connector.
- *1: for LHD
- *2: for RHD

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

Standard Resistance

for LHD

Tester Connection	Condition	Specified Condition
Q3-3 (ANT2) - T1 -13 (CG3B)	Always	Below 1 Ω
Q3-6 (ANT1) - T1-12 (CLG3)	Always	Below 1 Ω
Q3-5 (B) - T1-20 (POS3)	Always	Below 1 Ω
Q3-2 (GND) - Body ground	Always	Below 1 Ω
Q3-3 (ANT2) or T1-13 (CG3B) - Body ground	Always	10 kΩ or higher
Q3-6 (ANT1) or T1-12 (CLG3) - Body ground	Always	10 kΩ or higher
Q3-5 (B) or T1-20 (POS3) - Body ground	Always	10 kΩ or higher

for RHD

Tester Connection	Condition	Specified Condition
Q3-3 (ANT2) - U1-4 (CG4B)	Always	Below 1 Ω
Q3-6 (ANT1) - U1-3 (CLG4)	Always	Below 1 Ω
Q3-5 (B) - U1-22 (POS4)	Always	Below 1 Ω
Q3-2 (GND) - Body ground	Always	Below 1 Ω
Q3-3 (ANT2) or U1-4 (CG4B) - Body ground	Always	10 kΩ or higher
Q3-6 (ANT1) or U1-3 (CLG4) - Body ground	Always	10 kΩ or higher
Q3-5 (B) or U1-22 (POS4) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (SMART KEY ECU ASSEMBLY) (OUTPUT TO REAR DOOR ELECTRICAL KEY ANTENNA LH)

Front view of wire harness connector

(to Rear Door Outside Handle Assembly LH)

Waveform

Connect the T1*1 or U1*2 certification ECU (smart key ECU assembly) connector.

*1: for LHD
*2: for RHD

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

Standard Voltage

for LHD

Tester Connection	Switch Condition	Specified Condition
Q3-5 (B) - Q3-2 (GND)	Engine switch off → on (IG)	9 to 14 V → Below 2 V

Using an oscilloscope, check the waveform.

Tester Connection

Switch Condition

Tool Setting

Specified Condition

Q3-3 (ANT2) - Q3-6 (ANT1)

Procedure:

Engine switch off
Electrical key transmitter sub-assembly brought outside vehicle
All doors closed
Electrical key transmitter sub-assembly not inside vehicle
Electrical key transmitter sub-assembly brought outside detection area*
All doors locked through wireless operation

2 V/DIV., 500 ms./DIV.

Pulse generation

(See waveform)

*: For details about the areas that are inside the entry function detection area, refer to Operation Check.

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Result

Proceed to
OK
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

CHECK REAR DOOR OUTSIDE HANDLE ASSEMBLY LH

Temporarily replace the rear door outside handle assembly LH with a new or known good one.

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Result

Proceed to
NEXT

CHECK REAR DOOR OUTSIDE HANDLE ASSEMBLY LH (OPERATION)

Check that the entry functions operate normally.

Click here

OK
Entry functions operate normally.

Result

Proceed to
OK
NG

END (REAR DOOR OUTSIDE HANDLE ASSEMBLY LH WAS DEFECTIVE)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)