WIRELESS DOOR LOCK CONTROL SYSTEM > Only Wireless Control Function is Inoperative

for Preparation Click here

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. Check that there are no electrical key transmitters in the vehicle.
   
2. Before performing the inspection, check that DTC B1242 (wireless door lock control) is not output (Click here).
   
3. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
   
4. When replacing the certification ECU (smart key ECU assembly) or electrical key transmitter, refer to the Service Bulletin.
   
5. Troubleshooting should be started after confirming that the customize status of the wireless control function has been switched on (Click here).
   
6. Door control receiver has a constant voltage (5 V) supply circuit connected to terminal "+5".
   

1. Check the vehicle specification.
   

   Result:

   Result	Proceed to
   w/o Entry Function	A
   w/ Entry Function	B

B	GO TO PROBLEM SYMPTOMS TABLE (Click here)

A

1. Measure the voltage of the auxiliary battery with the power switch off.
   

   Standard voltage:

   11 to 14 V
   

   HINT:

   It may be possible to tell whether the auxiliary battery is depleted by operating the horn.

   1. If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding.
      

NEXT

1. Open the driver door using the mechanical key built into the electrical key transmitter.
   

2. Connect the intelligent tester and check for DTCs (Click here).
   

   HINT:

   When using the intelligent tester with the power 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

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

1. When a known good registered electrical key transmitter is used, check that the wireless functions operate normally.
   

   Result 

   Result	Proceed to
   Wireless door LOCK/UNLOCK function operates normally with a known good electrical key transmitter.	A
   Wireless door LOCK/UNLOCK function does not operate	B

B	Go to step 8

A

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

   Result 

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

   HINT:

   1. The key 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 2.1 V or less (Click here).
      
   2. Even if the key battery is depleted, it is still possible to start the hybrid control system by holding the key against the power switch, depressing the brake pedal and pressing the power switch.
      

B	REPLACE ELECTRICAL KEY TRANSMITTER
C	REPLACE TRANSMITTER BATTERY (Click here)

A

1. Inspect the transmitter battery (for Type A)
   

   
   
   

   1. Remove the battery from the electrical key transmitter that does not operate (Click here).
      

   2. Attach a lead wire (0.60 mm [0.0236 in.] in diameter or less including wire sheath) with tape or equivalent to the negative terminal.
      

      Text in Illustration 

      *1

      Lead Wire

      NOTICE:

      Do not wrap the lead wire around a terminal, wedge it between terminals, or solder it. The terminal may be deformed or damaged, and the battery will not be able to be installed correctly.

   3. Carefully pull the lead wire out from the position shown in the illustration and install the previously removed transmitter battery.
      

   
   
   

   4. Measure the voltage of the transmitter battery.
      

      NOTICE:

      When replacing the transmitter battery, before starting work, remove static electricity that has built up in the body by touching, for example, the vehicle to prevent the electrical transmitter from being damaged.

      HINT:

      1. Measure the transmitter battery voltage while pressing the LOCK or UNLOCK switch on the electrical key transmitter.
         
      2. Perform the measurement when the key is at room temperature.
         
      3. The key sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. When this voltage is 2.1 V or less the Data List item "Key Low Battery" displays "Yes" (Click here).
         

      Text in Illustration 

      *1

      GND

      Standard Voltage:

      Tester Connection	Condition	Specified Condition
      Transmitter battery positive (+) - Transmitter battery negative (-)	Power switch off, all doors closed and LOCK or UNLOCK switch is pressed	2.2 to 3.2 V

2. Inspect the transmitter battery (for Type B)
   

   
   
   

   1. Remove the battery from the electrical key transmitter that does not operate (Click here).
      

   2. Attach a lead wire (0.60 mm [0.0236 in.] in diameter or less including wire sheath) with tape or equivalent to the negative terminal.
      

      Text in Illustration 

      *1

      Lead Wire

      NOTICE:

      Do not wrap the lead wire around a terminal, wedge it between terminals, or solder it. The terminal may be deformed or damaged, and the battery will not be able to be installed correctly.

   3. Carefully pull the lead wire out from the position shown in the illustration and install the previously removed transmitter battery.
      

   
   
   

   4. Measure the voltage of the transmitter battery.
      

      NOTICE:

      When replacing the transmitter battery, before starting work, remove static electricity that has built up in the body by touching, for example, the vehicle to prevent the electrical transmitter from being damaged.

      HINT:

      1. Measure the transmitter battery voltage while pressing the LOCK or UNLOCK switch on the electrical key transmitter.
         
      2. Perform the measurement when the key is at room temperature.
         
      3. The key sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. When this voltage is 2.1 V or less the Data List item "Key Low Battery" displays "Yes" (Click here).
         

      Text in Illustration 

      *1

      GND

      Standard Voltage:

      Tester Connection	Condition	Specified Condition
      Transmitter battery positive (+) - Transmitter battery negative (-)	Power switch off, all doors closed and LOCK or UNLOCK switch is pressed	2.2 to 3.2 V

NG	REPLACE TRANSMITTER BATTERY (Click here)

OK
REPLACE ELECTRICAL KEY TRANSMITTER

1. Bring the electrical key transmitter near the door control receiver and perform a wireless function operation check.
   

   HINT:

   1. When the electrical key transmitter is brought near the door control receiver, the possibility of electric wave interference decreases, and it can be determined if electric wave interference is causing the problem symptom.
      
   2. 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.
      
   3. There may be electric 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.
      

   OK:

   Wireless functions operate normally.
   

NG	Go to step 9

OK
AFFECTED BY WAVE INTERFERENCE

1. When the power switch is off, check that the functions other than the wireless functions recognize the power source mode as being off.
   

   HINT:

   1. Check if systems that should not be operating when the power source mode is off are operating.
      
   2. When the certification ECU (smart key ECU assembly) mistakenly determines the power source mode to be on (IG) for some reason (example: an ECU mistakenly determines the power source mode to be on (IG) and sends that information to the certification ECU (smart key ECU assembly)) even though the power source mode is off, the certification ECU (smart key ECU assembly) stops the wireless functions.
      

   OK:

   When the power source mode is off, functions other than the wireless functions recognize the power source mode as being off.
   

NG	GO TO PUSH-BUTTON START SYSTEM (Click here)

OK

1. Disconnect the H143 ECU connector.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   H143-17 (CUTB) - Body ground	IG OFF	11 to 14 V
   H143-1 (+B) - Body ground	IG OFF	11 to 14 V

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   H143-15 (E) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. Disconnect the Q8 door control receiver connector.
   

2. Disconnect the H144 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
   Q8-4 (+5) - H144-5 (RCO)	Always	Below 1 Ω
   Q8-5 (DATA) - H144-15 (RDA)	Always	Below 1 Ω
   Q8-2 (RSSI) - H144-16 (RSSI)	Always	Below 1 Ω
   Q8-1 (GND) - Body ground	Always	Below 1 Ω
   Q8-4 (+5) or H144-5 (RCO) - Body ground	Always	10 kΩ or higher
   Q8-5 (DATA) or H144-15 (RDA) - Body ground	Always	10 kΩ or higher
   Q8-2 (RSSI) or H144-16 (RSSI) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. Temporarily replace the door control receiver with a new or normally functioning one (Click here).
   

2. Check that the wireless functions operate normally.
   

   OK:

   Wireless functions operate normally.
   

NG	REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK
END (DOOR CONTROL RECEIVER WAS DEFECTIVE)