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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) power door lock control system; 2) electrical key antenna (for rear side); 3) certification ECU (smart key ECU assembly), or 4) back door opener switch assembly.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* The smart key system (for entry function) uses a LIN communication system and 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 system is functioning properly.
* Confirm that another key is not in the cabin.

PROCEDURE

1. CHECK POWER DOOR LOCK OPERATION

(a) When the door control switch on the master switch assembly is operated, check that the doors unlock and lock according to switch operation Operation Check.

OK:

Door locks operate normally.

NG -- GO TO POWER DOOR LOCK CONTROL SYSTEM (Proceed to Problem Symptoms Table) Problem Symptoms Table
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (BACK DOOR OPENER SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Smart Key / Data List.

(e) Read the Data List according to the display on the Techstream.

Smart Key (Certification ECU (Smart Key ECU Assembly))





OK:

On the Techstream screen, the display changes between ON and OFF as shown in the table above.

NG -- CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH - BODY GROUND)
OK -- Continue to next step.

3. CHECK WAVE ENVIRONMENT

(a) Bring the key near the electrical key antenna (for rear side), and perform an entry back door open and entry lock functions check.





Text in Illustration





NOTICE:
If the key is brought within 0.2 m (0.656 ft.) of the rear bumper, communication is not possible.

HINT
* When pressing the lock switch and pressing the opener switch, hold the electrical key transmitter about 1 m (3.28 ft.) above the ground and about 0.3 m (0.984 ft.) away from the vehicle as shown in the illustration.
* When the key is brought near the electrical key antenna (for rear side), the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
* If the operation 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

4. PERFORM KEY DIAGNOSTIC MODE INSPECTION

(a) Diagnostic mode inspection (electrical key antenna (for rear side))





Text in Illustration





(1) Connect the Techstream to the DLC3.

(2) Turn the power switch on (IG).

(3) Turn the Techstream on.

(4) Enter the following menus: Body Electrical / Smart Key / Utility / Key Communication Check / Overhead + Back Door.

(5) When the electrical key transmitter is in the position shown in the illustration, check that the wireless door lock buzzer sounds.

HINT
* Hold the electrical key transmitter at the same height as the rear bumper upper surface and align with the center of the rear of the vehicle (0.7 to 1.0 m (2.30 to 3.28 ft.)). Make sure that the direction of the key is as shown in the illustration.
* If the buzzer sounds, it can be determined that the electrical key antenna (for rear side) is operating normally.

OK:

Wireless door lock buzzer sounds.

NG -- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ELECTRICAL KEY ANTENNA)

OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

5. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ELECTRICAL KEY ANTENNA)

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

(b) Disconnect the electrical key antenna (for rear side) 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.

6. INSPECT ELECTRICAL KEY ANTENNA (for Rear Side)

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





Standard Resistance:





Text in Illustration





NG -- REPLACE ELECTRICAL KEY ANTENNA (for Rear Side) Disassembly

OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

7. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH - BODY GROUND)

(a) Disconnect the back door opener switch assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE BACK DOOR OPENER SWITCH ASSEMBLY Removal
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