All Door Entry Lock/Unlock Functions And Wireless Functions Do Not Operate

THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function): All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate
- All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate

DESCRIPTION

When the entry door lock and unlock functions and wireless door lock and unlock functions do not operate, radio wave interference, or a malfunction in the key or signal circuit between the door control receiver and certification ECU (smart key ECU assembly) is suspected. The signal circuit is shared by the entry function and wireless door lock function.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* The smart access system with push-button start (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 access system with push-button start (for entry function) after confirming that the communication system is functioning properly.
* Before performing the inspection, check that DTC B1242 (wireless door lock control) is not output B1242.
* Confirm that another key is not in the cabin.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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. CHECK ELECTRICAL KEY TRANSMITTER

(a) Check if another registered key is available.

Result:

B -- CHECK ELECTRICAL KEY TRANSMITTER (OPERATION)
A -- Continue to next step.

3. REGISTER ELECTRICAL KEY TRANSMITTER

(a) Register a new key Engine Immobilizer System.

NEXT -- Continue to next step.

4. CHECK ELECTRICAL KEY TRANSMITTER (OPERATION)

(a) Using the key registered in the previous step or another registered key, check that the entry function operates normally Operation Check.

OK:

Entry function operates normally.

NG -- CHECK WAVE ENVIRONMENT
OK -- Continue to next step.

5. CHECK ELECTRICAL KEY TRANSMITTER (LED)

(a) Press and hold the lock switch of the transmitter for 5 seconds and check the number of times that the transmitter LED illuminates.

Result

HINT
* 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 Smart Access System With Push-Button Start (for Entry Function).
* Even if the key battery is depleted, it is still possible to start the engine by holding the key against the engine switch, depressing the brake pedal and pressing the engine switch.

C -- REPLACE TRANSMITTER BATTERY Service and Repair

B -- REPLACE ELECTRICAL KEY TRANSMITTER
A -- Continue to next step.

6. INSPECT TRANSMITTER BATTERY (VOLTAGE)

(a) Remove the battery from the key that does not operate. Attach a lead wire (0.6 mm (0.0236 in.) or less in diameter including wire sheath) with tape or equivalent to the negative (-) terminal Service and Repair.

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

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

(c) Using an oscilloscope, check the transmitter battery voltage waveform.

HINT
When measuring the battery voltage, while operating the lock switch of a door outside handle assembly, bring the key within the entry operating range to perform the measurement. For the entry operating range, refer to System Description Smart Access System With Push-Button Start (for Entry Function).

Standard Voltage:

Text in Illustration

NG -- REPLACE TRANSMITTER BATTERY Service and Repair

OK -- REPLACE ELECTRICAL KEY TRANSMITTER

7. CHECK WAVE ENVIRONMENT

(a) Bring the key near the door control receiver, and check the wireless function.

HINT
* When the key is brought near the door control receiver, the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
* If the inspection result indicates that the problem only occurs in certain locations or 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:

Wireless function operates normally.

NG -- CHECK POWER SOURCE

OK -- AFFECTED BY WAVE INTERFERENCE

8. CHECK POWER SOURCE

(a) Check if functions other than the entry function operate when the power switch is off.

Result:

HINT
Perform this check using functions that do not require the power switch to be on (ACC or IG) in order to operate.

B -- GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (Proceed to How to Proceed with Troubleshooting) How To Proceed With Troubleshooting
A -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BATTERY AND BODY GROUND)

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

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

Standard Voltage:

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - DOOR CONTROL RECEIVER)

(a) Disconnect the door control receiver connector.

(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.

11. CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - BODY GROUND)

(a) 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.

12. INSPECT DOOR CONTROL RECEIVER (POWER SOURCE)

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

(b) Reconnect the door control receiver connector.

Text in Illustration

NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal
OK -- Continue to next step.

13. INSPECT DOOR CONTROL RECEIVER (DOOR CONTROL RECEIVER SIGNAL OUTPUT)

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

Standard Voltage:

Text in Illustration

NG -- REPLACE DOOR CONTROL RECEIVER Removal

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