Back Door Entry Lock And Unlock Functions Do Not Operate
THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function): Back Door Entry Lock and Unlock Functions do not Operate
- 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) the power door lock control system, 2) the electrical key antenna (outside luggage) or 3) the certification ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* The smart key system (for Entry Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting How To Proceed With Troubleshooting. Troubleshoot the smart key system (for Entry Function) after confirming that the communication systems are functioning properly.
* When using the Techstream with the engine switch off to troubleshoot: Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.
* Check that there are no electrical key transmitters in the vehicle.
* When checking the entry lock operation multiple times, the lock operation may be limited to 2 consecutive operations depending on the settings. In order to perform the entry lock operation 3 or more times, an unlock operation must be performed once (any type of unlock operation is sufficient). However, only consecutive entry lock operations are limited. Using the wireless lock or other types of lock operations, it is possible to perform consecutive lock operations without this limitation.
* Before replacing the certification ECU, refer to the engine immobiliser system (w/ Smart Key System) Engine Immobiliser System (W/ Smart Key System).
PROCEDURE
1. CHECK POWER DOOR LOCK OPERATION
(a) When the door control switch on the multiplex network master switch assembly is operated, check that the doors unlock and lock according to the switch operation Operation Check.
OK:
Door locks operate normally.
NG -- GO TO POWER DOOR LOCK CONTROL SYSTEM How To Proceed With Troubleshooting
OK -- Continue to next step.
2. CHECK WAVE ENVIRONMENT
(a) Bring the electrical key transmitter approximately 0.3 m (0.984 ft.) from the electrical key antenna (outside luggage) and perform an entry back door unlock function check Operation Check.
NOTICE:
If the key is brought within 0.2 m (0.656 ft.) of the rear bumper, communication may not possible.
HINT
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.
OK:
Entry function operates normally.
NG -- CHECK ELECTRICAL KEY ANTENNA IN KEY DIAGNOSTIC MODE
OK -- AFFECTED BY WAVE INTERFERENCE
3. CHECK ELECTRICAL KEY ANTENNA IN KEY DIAGNOSTIC MODE
(a) Check the following antenna in the key diagnostic mode Smart Key System (for Entry Function).
(1) Check the electrical key antenna (outside luggage).
When the electrical key transmitter is brought within 0.7 to 1.0 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.
NG -- CHECK HARNESS AND CONNECTOR (ELECTRICAL KEY ANTENNA - CERTIFICATION ECU)
OK -- REPLACE CERTIFICATION ECU Removal
4. CHECK HARNESS AND CONNECTOR (ELECTRICAL KEY ANTENNA - CERTIFICATION ECU)
(a) Disconnect the N21 antenna connector.
(b) Disconnect the F78 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. INSPECT ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE)
(a) Remove the electrical key antenna (outside luggage) Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE) Removal
OK -- REPLACE CERTIFICATION ECU Removal