RM35X0E _58 Vehicle Interior _078378 THEFT DETERRENT / KEYLESS ENTRY _0397001 ENTRY AND START SYSTEM(for Start Function) C

THEFT DETERRENT / KEYLESS ENTRY  ENTRY AND START SYSTEM(for Start Function)  B27AC  Open in Extra 2 Electrical Key Oscillator Circuit  


DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 1 indoor electrical key antenna assembly (rear LH floor). For the No. 1 indoor electrical key antenna assembly (rear LH floor) to detect when the electrical key transmitter sub-assembly is in the cabin, the signal from the certification ECU (smart key ECU assembly) requesting a response from the electrical key transmitter sub-assembly is transmitted inside the vehicle. DTC B27AC is stored by the certification ECU (smart key ECU assembly) when an open is detected between the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (rear LH floor) (between terminals CLGP and ANT2, or terminals CGPB and ANT1).

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B27AC Open in Extra 2 Electrical Key Oscillator Circuit An open is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (rear LH floor) (CLGP - ANT2, CGPB - ANT1) (1 trip detection logic*).
·

Certification ECU (smart key ECU assembly)

·

No. 1 indoor electrical key antenna assembly (rear LH floor)

·

Harness or connector


DTC Output Confirmation Operation:

Any time



*: 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
When electrical key transmitter sub-assembly is in luggage compartment:
·

Power source mode does not change when engine switch pressed

·

Electrical key transmitter sub-assembly locked inside vehicle


-

Related Data List and Active Test
DTC No. Data List and Active Test
B27AC Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

E421140E03
1.292,1.917 1.969,2.115 0.677,0.198 10 false ANT1 1.333,0.76 1.948,0.958 0.615,0.198 10 false ANT2 1.771,1.906 1.927,2.104 0.156,0.198 10 false 2 1.76,0.76 1.917,0.958 0.156,0.198 10 false 1 4.906,0.865 5.302,1.094 0.396,0.229 10 false N155 4.99,1.813 5.302,2.01 0.313,0.198 10 false 3 4.979,0.667 5.292,0.865 0.313,0.198 10 false 4 5.313,1.906 5.927,2.104 0.615,0.198 10 false CGPB 5.323,0.771 5.938,0.969 0.615,0.198 10 false CLGP 5.833,1.385 6.146,1.583 0.313,0.198 10 false IC 0.219,2.521 0.677,2.719 0.458,0.198 10 false V27 0.219,2.688 3.073,3.573 2.854,0.885 10 false No. 1 Indoor Electrical Key Antenna Assembly (Rear LH Floor) 5.104,2.531 6.635,3.49 1.531,0.958 10 false Certification ECU (Smart Key ECU Assembly) 6.458,2.021 6.917,2.219 0.458,0.198 10 false N156 6.531,1.802 6.844,2 0.313,0.198 10 false 18 6.25,2 6.406,2.198 0.156,0.198 10 false E 4.917,2.01 5.333,2.229 0.417,0.219 10 false N155

CAUTION / NOTICE / HINT

NOTICE:
·

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

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>ENTRY AND START SYSTEM (for Start Function)>HOW TO PROCEED WITH TROUBLESHOOTING

·

When using the GTS with the engine 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. 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.

·

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

·

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



PROCEDURE

1.CHECK CONNECTOR CONNECTION
a.

Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (rear LH floor).


Result:
Result Proceed to
The connectors are properly connected A
The connectors are not properly connected B



A

2.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR LH FLOOR))

B

CONNECT CONNECTORS PROPERLY

2.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR LH FLOOR))
a.

Disconnect the N155 certification ECU (smart key ECU assembly) connector.


b.

Disconnect the V27 No. 1 indoor electrical key antenna assembly (rear LH floor) connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N155-4 (CLGP) - V27-1 (ANT2) Always Below 1 Ω
N155-3 (CGPB) - V27-2 (ANT1) Always Below 1 Ω



d.

Reconnect the N155 certification ECU (smart key ECU assembly) connector.


Result:
Proceed to
OK
NG



OK

3.CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR LH FLOOR))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR LH FLOOR))
B477958C25
4.552,0.438 4.927,0.667 0.375,0.229 3.292,0.448 3.667,0.677 0.375,0.229 2.656,2.219 3.01,1.115 true 3.281,2.24 3.083,1.125 true 5.625,2.323 5.208,1.313 true 0.229,0.146 0.542,0.344 0.313,0.198 10 false *a 0.875,2.76 1.188,2.958 0.313,0.198 10 false *b 0.74,3.698 1.167,3.885 0.427,0.188 10 false GND 1.51,4.375 1.802,4.563 0.292,0.188 10 false *c 2.406,4.396 2.698,4.583 0.292,0.188 10 false *d 3.188,2.271 3.688,2.458 0.5,0.188 10 false CGPB 2.417,2.26 2.948,2.469 0.531,0.208 10 false CLGP 5.646,2.385 5.938,2.573 0.292,0.188 10 false E 4.583,0.479 5.083,0.771 0.5,0.292 10 false N156 3.323,0.479 3.729,0.698 0.406,0.219 10 false N155
*a Component with harness connected
(Certification ECU (Smart Key ECU Assembly)) 		*b Waveform
*c For 30 seconds after any door closed *d After 30 seconds or more have elapsed since any door closed


a.

Using an oscilloscope, check the waveform.

OK:
Tester Connection Condition Tool Setting Specified Condition
N155-4 (CLGP) - N156-18 (E) Procedure:
1.

Engine switch off

2.

Electrical key transmitter sub-assembly not inside vehicle

3.

Within 30 seconds of closing any door


2 V/DIV., 500 ms/DIV. Pulse generation
(See waveform)
N155-3 (CGPB) - N156-18 (E) Procedure:
1.

Engine switch off

2.

Electrical key transmitter sub-assembly not inside vehicle

3.

Within 30 seconds of closing any door


2 V/DIV., 500 ms/DIV. Pulse generation
(See waveform)



Result:
Proceed to
OK
NG



OK

REPLACE NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR LH FLOOR)

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>ELECTRICAL KEY OSCILLATOR (for Rear Floor)>REMOVAL


NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)