RM3660EC _58 Vehicle Interior _080747 THEFT DETERRENT / KEYLESS ENTRY _0600575 DIGITAL KEY SYSTEM C

THEFT DETERRENT / KEYLESS ENTRY  DIGITAL KEY SYSTEM  B27C087  Digital Key System Missing Message  


DESCRIPTION

This DTC is output when response frames from the digital key ECU assembly were not received 7 times consecutively x 7 sets after UART communication was established.

Also, communication is not possible between the digital key ECU and certification ECU (smart key ECU assembly) when the OTA function used by the digital key is operating. Therefore, when the OTA function is operating due to a digital key operation, etc., and communication between the certification ECU (smart key ECU assembly) and digital key ECU is not possible, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Priority Note
B27C087 Digital Key System Missing Message Output when response frames from the digital key ECU assembly were not received 7 times consecutively x 7 sets after UART communication was established
Also, when communication is not possible between the digital key ECU and certification ECU (smart key ECU assembly) when the OTA function used by the digital key is operating. Therefore, when the OTA function is operating due to a digital key operation, etc., and the certification ECU (smart key ECU assembly) sends a signal to the digital key ECU, communication is not possible and this DTC is stored.
·

Certification ECU (smart key ECU assembly)

·

Digital key ECU assembly

·

Wire harness or connector


Entry&Start A
DTC Output Confirmation Operation:

Any time



Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Digital key system does not operate -

WIRING DIAGRAM

B621852E39
4.156,0.854 5.375,1.042 1.219,0.188 10 false ECU-DCC NO. 2 5.365,0.625 5.677,0.823 0.313,0.198 10 false 1 5.552,0.719 5.802,0.917 0.25,0.198 10 false +B 5.552,1.885 6.01,2.083 0.458,0.198 10 false GND 5.563,1.313 6.177,1.51 0.615,0.198 10 false UART 5.313,1.167 5.625,1.365 0.313,0.198 10 false 23 1.708,1.156 2.021,1.354 0.313,0.198 10 false 17 1.26,1.313 1.875,1.51 0.615,0.198 10 false UAT2 0.906,3.406 3.052,3.604 2.146,0.198 10 false : UART Communication Line 0.104,2.563 0.479,2.781 0.375,0.219 10 false I196 5.208,2.573 6.052,2.854 0.844,0.281 10 false O175 5.208,2.729 7.156,2.927 1.948,0.198 10 false Digital Key ECU Assembly 5.292,1.781 5.604,1.979 0.313,0.198 10 false 10 2.385,0.719 4.073,0.938 1.688,0.219 10 false from Auxiliary Battery 0.094,2.729 3.01,2.927 2.917,0.198 10 false Certification ECU (Smart Key ECU Assembly)

CAUTION / NOTICE / HINT

NOTICE:
·

Before replacing certification ECU (smart key ECU assembly) or digital key ECU assembly, refer to Service Bulletin.

·

Inspect the fuses for circuits related to this system before performing the following procedure.



PROCEDURE

1.CHECK HARNESS AND CONNECTOR (DIGITAL KEY ECU ASSEMBLY - POWER SOURCE))
a.
B628615
1.49,0.146 1.896,0.417 0.406,0.271 2.719,0.396 2.552,0.396 2.552,0.396 2.552,0.896 true 1.521,0.219 2.135,0.417 0.615,0.198 10 false O175 2.771,0.333 3.094,0.49 0.323,0.156 10 false +B 0.135,0.135 0.75,0.333 0.615,0.198 10 false *a
*a Component with harness connected
(Digital key ECU Assembly)


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

Standard Voltage:
Tester Connection Condition Specified Condition
O175-1 (+B) - Body ground Ignition switch off 11 to 14 V


Result:
Proceed to
OK
NG




OK

2.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - DIGITAL KEY ECU ASSEMBLY - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - DIGITAL KEY ECU ASSEMBLY - BODY GROUND)

Pre-procedure1

a.

Disconnect the I196 certification ECU (smart key ECU assembly) connector.


b.

Disconnect the O175 digital key ECU connector.


Procedure1

c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I196-17 (UAT2) - O175-23 (UART) Always Below 1 Ω
I196-17 (UAT2) or O175-23 (UART) - Other terminals and body ground Always 10 kΩ or higher
O175-10 (GND) - Body ground Always Below 1 Ω


Result:
Proceed to
OK
NG



Post-procedure1

d.

Connect the I196 certification ECU (smart key ECU assembly) connector.



OK

3.CHECK OPERATION HISTORY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK OPERATION HISTORY
a.

Check the digital key application operation history and check if there is OTA function history.

HINT:

Refer to operation history of the digital key application


Result:
Result Proceed to
There is OTA function history A
There is no OTA function history B




A

CLEAR DTCs
HINT:

The following may be the cause:

·

Communication between the certification ECU (smart key ECU assembly) and digital key ECU could not be performed as the OTA function was operating.




B

4.CLEAR DTC
4.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Entry&Start > Clear DTCs
50002 440
Result:
Proceed to
NEXT




NEXT

5.CHECK DTC
5.CHECK DTC
a.

Check for DTCs.

Body Electrical > Entry&Start > Trouble Codes
50001 440
Result:
Result Proceed to
B27C087 is not output A
B27C087 is output B




A

REPLACE DIGITAL KEY ECU ASSEMBLY

B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)