RM38T0EC _58 Vehicle Interior _115230 THEFT DETERRENT / KEYLESS ENTRY _0606512 SMART ENTRY AND START SYSTEM(for Start Function, HEV Model) C

THEFT DETERRENT / KEYLESS ENTRY SMART ENTRY AND START SYSTEM(for Start Function, HEV Model) B279A12 Engine Immobiliser System Circuit Short to Battery

DESCRIPTION

If the communication line (IMI - EFIO) between the hybrid vehicle control ECU and ID code box (immobiliser code ECU) is stuck high, the hybrid vehicle control ECU will store this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B279A12	Engine Immobiliser System Circuit Short to Battery	The communication line (IMI - EFIO) between the hybrid vehicle control ECU and ID code box (immobiliser code ECU) is stuck high. (1 trip detection logic*)	· ID code box (immobiliser code ECU) · Hybrid vehicle control ECU · Wire harness or connector	DTC output confirmation operation: Turn the ignition switch to ON and wait 6 seconds.

*: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected	Fail-safe Operation when Malfunction Detected
Hybrid control system cannot be started	Hybrid control system cannot be started

Related Data List and Active Test
DTC No.	Data List and Active Test
B279A12	-

WIRING DIAGRAM

5.083,1.76 6.99,2.167 1.906,0.406 10 false Hybrid Vehicle Control ECU 5.083,1.583 5.542,1.781 0.458,0.198 10 false I278 5.813,0.302 6.271,0.5 0.458,0.198 10 false +B 5.135,0.583 5.594,0.781 0.458,0.198 10 false IMI 4.844,0.583 5.302,0.781 0.458,0.198 10 false 53 2.208,0.594 2.667,0.792 0.458,0.198 10 false 4 1.729,0.583 2.188,0.781 0.458,0.198 10 false EFIO 0.521,1.583 0.979,1.781 0.458,0.198 10 false I20 0.521,1.75 2.125,2.229 1.604,0.479 10 false ID Code Box (Immobiliser Code ECU)

CAUTION / NOTICE / HINT

NOTICE:: ·

When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

·

The smart entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, HEV Model)>HOW TO PROCEED WITH TROUBLESHOOTING202307,999999,_58,_115230,_0606512,RM100000002C24Z,

·

Before replacing the hybrid vehicle control ECU or ID code box (immobiliser code ECU), refer to Service Bulletin.

·

After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

HINT:: When DTC B279A12 and the certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.

PROCEDURE

1.CHECK CONNECTION OF CONNECTOR

Turn the ignition switch off.

Check that the connectors are properly connected to the hybrid vehicle control ECU and ID code box (immobiliser code ECU).

OK:: Connectors are properly connected.

Result:

Proceed to
OK
NG

2.CHECK HYBRID VEHICLE CONTROL ECU (TERMINAL IMI)

CONNECT CONNECTORS PROPERLY

2.CHECK HYBRID VEHICLE CONTROL ECU (TERMINAL IMI)

Using an oscilloscope, check the waveform.

4.438,0.135 4.854,0.385 0.417,0.25 3.75,2.375 4.031,1.469 true 3.531,4.552 3.406,4.073 true 3.104,4.563 3.208,4.073 true 0.104,0.104 0.417,0.26 0.313,0.156 10 false *a 3.229,3.031 3.542,3.188 0.313,0.156 10 false *b 2.99,4.573 3.302,4.729 0.313,0.156 10 false *c 3.667,2.385 3.958,2.625 0.292,0.24 10 false IMI 4.51,0.167 4.948,0.406 0.438,0.24 10 false I278 3.542,4.573 3.833,4.813 0.292,0.24 10 false *d 0.875,4.031 1.292,4.24 0.417,0.208 10 false GND

*a	Component with harness connected (Hybrid Vehicle Control ECU)	*b	Waveform
*c	Approximately 160 ms.	*d	Approximately 270 ms.

OK:

Tester Connection	Condition	Tool Setting	Specified Condition
I278-53 (IMI) - Body ground	Within 3 seconds of hybrid control system start or within 3 seconds of ignition switch turned to ON after cable disconnected and reconnected to auxiliary battery	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform)

Result:

Result	Proceed to
11 to 14 V	A
Below 1 V	B
Normal waveform	B

3.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - HYBRID VEHICLE CONTROL ECU)

REPLACE HYBRID VEHICLE CONTROL ECU

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID VEHICLE CONTROL ECU>REMOVAL202307,999999,_51,_144957,_0604236,RM100000002BTQT,

3.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - HYBRID VEHICLE CONTROL ECU)

Disconnect the I278 hybrid vehicle control ECU connector.

Disconnect the I20 code box (immobiliser code ECU) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I20-4 (EFIO) - I278-53 (IMI)	Always	Below 1 Ω

Result:

Proceed to
OK
NG

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR