Back Door Entry Lock And Unlock Functions Do Not Operate
DOOR LOCK: SMART KEY SYSTEM: 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) power door lock control system, or 2) outside electrical key oscillator (back door), or 3) main body ECU (instrument panel junction block), or 4) certification ECU (smart key ECU assembly).
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
Before performing the inspection, check that there are no problems related to "CAN COMMUNICATION SYSTEM" and "LIN COMMUNICATION SYSTEM".
PROCEDURE
1. CHECK POWER DOOR LOCK OPERATION
(a) When the door control switch on the master switch assembly is operated, check that the locked doors unlock Operation Check.
OK:
Locked doors unlock.
NG -- GO TO POWER DOOR LOCK CONTROL SYSTEM Problem Symptoms Table
OK -- Continue to next step.
2. CHECK WAVE ENVIRONMENT
(a) Bring the electrical key transmitter near the outside electrical key oscillator (back door), and perform an entry back door open and entry lock functions check.
NOTICE:
If the key is brought within 0.2 m (0.656 ft.) of the rear bumper, communication is not possible.
HINT
* When the electrical key transmitter is brought near the electrical key antenna, the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
* If the operation check 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
OK -- AFFECTED BY WAVE INTERFERENCE
3. PERFORM KEY DIAGNOSTIC MODE INSPECTION
(a) Diagnostic mode inspection (outside electrical key oscillator (back door))
(1) Connect Techstream to the DLC3.
(2) Turn the engine switch on (IG).
(3) Turn the tester on.
(4) Enter the following menus:
Body Electrical / Smart Key / Utility / Communication Check (Key Diag Mode) / Overhead + Back Door.
(5) When the electrical key transmitter 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.
HINT
If the buzzer sounds, it can be determined that the back door outside electrical key oscillator is operating normally.
OK:
Wireless door lock buzzer sounds.
NG -- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - OUTSIDE ELECTRICAL KEY OSCILLATOR)
OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal
4. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - OUTSIDE ELECTRICAL KEY OSCILLATOR)
(a) Disconnect the certification ECU (smart key ECU assembly) and outside electrical key oscillator connectors.
(b) 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. REPLACE OUTSIDE ELECTRICAL KEY OSCILLATOR
(a) Replace the outside electrical key oscillator Removal.
NEXT -- Continue to next step.
6. CHECK OUTSIDE ELECTRICAL KEY OSCILLATOR (OPERATION)
(a) Check that the entry functions operate normally.
OK:
Entry functions operate normally.
NG -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
OK -- END (OUTSIDE ELECTRICAL KEY OSCILLATOR IS DEFECTIVE)
7. REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
(a) Replace the main body ECU (instrument panel junction block).
NEXT -- Continue to next step.
8. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) (OPERATION)
(a) Check that the entry functions operate normally.
OK:
Entry functions operate normally.
NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal
OK -- END (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) IS DEFECTIVE)