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 BEAN 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.
* Confirm that another key is not in the cabin.
* Before performing the inspection, check that DTC B1242 (wireless door lock control) is not output B1242.
* When only the key (for card type) does not operate the entry lock/unlock functions for all doors, it can be suspected that the key (for card type) is malfunctioning or its battery is depleted. Refer to Problem Symptoms Table Problem Symptoms Table.

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) When another registered key is used, check that the wireless and entry functions operate normally Operation Check.

Result:

B -- CHECK WAVE ENVIRONMENT
A -- Continue to next step.

3. CHECK ELECTRICAL KEY TRANSMITTER (LED)

(a) Check that the transmitter LED illuminates 3 times when the switch is pressed 3 times.

Result:

HINT
If the transmitter LED does not illuminate the second or third time, replace the transmitter battery as it is depleted.

C -- REPLACE TRANSMITTER BATTERY Removal

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

4. INSPECT TRANSMITTER BATTERY (VOLTAGE)

(a) Type A:

(1) 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 Removal.

NOTICE:
Do not wrap the lead wire around a 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.

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

(3) 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:

(b) Type B:

(1) 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.

NG -- REPLACE TRANSMITTER BATTERY Removal

OK -- REPLACE ELECTRICAL KEY TRANSMITTER

5. CHECK WAVE ENVIRONMENT

(a) Bring the key near the door control receiver, and perform a wireless and smart operation check.

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 is 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 and entry functions operate normally.

NG -- INSPECT FUSE (SECURITY)

OK -- AFFECTED BY WAVE INTERFERENCE

6. INSPECT FUSE (SECURITY)

(a) Remove the SECURITY fuse from the main body ECU LH (cowl side junction block LH).

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

Standard Resistance:

NG -- REPLACE FUSE (SECURITY)
OK -- Continue to next step.

7. 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.

8. 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:

Text in Illustration

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

9. REPLACE DOOR CONTROL RECEIVER

(a) Replace the door control receiver Removal.

NEXT -- Continue to next step.

10. CHECK DOOR CONTROL RECEIVER (OPERATION)

(a) Check that the wireless and entry functions operate normally Operation Check.

OK:

Wireless and entry functions operate normally.

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

OK -- END (DOOR CONTROL RECEIVER WAS DEFECTIVE)