RM36D0EC _58 Vehicle Interior _083094 THEFT DETERRENT / KEYLESS ENTRY _0403000 SMART ENTRY AND START SYSTEM(for Start Function, Gasoline Model) C

THEFT DETERRENT / KEYLESS ENTRY  SMART ENTRY AND START SYSTEM(for Start Function, Gasoline Model)  B27841C  Antenna Coil Circuit Voltage Out of Range  


DESCRIPTION

When an open or short circuit is detected in the transponder key amplifier coil built into the engine switch, the certification ECU (smart key ECU assembly) stores this DTC. This DTC is also stored as a history DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B27841C Antenna Coil Circuit Voltage Out of Range The transponder key amplifier coil built into the engine switch is open (see below) or shorted (determined by communication with certification ECU (smart key ECU assembly)). (1 trip detection logic*)
·

Engine switch

·

Certification ECU (smart key ECU assembly)

·

Wire harness or connector


DTC output confirmation operation:

With the shift position in P and the electrical key transmitter sub-assembly held near the engine switch, an engine start operation is performed by pressing and holding the engine switch when the transmitter battery is depleted.



*: 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
Engine cannot be started when transmitter battery is depleted by holding electrical key transmitter sub-assembly near engine switch and pressing and holding engine switch with shift position in P -

Related Data List and Active Test
DTC No. Data List and Active Test
B27841C -

WIRING DIAGRAM

B724471E02
1.479,0.802 2.094,1 0.615,0.198 10 false ANT1 4.969,0.906 5.583,1.104 0.615,0.198 10 false ANT1 1.479,1.646 2.094,1.844 0.615,0.198 10 false ANT2 4.979,1.75 5.594,1.948 0.615,0.198 10 false ANT2 1.948,0.802 2.104,1 0.156,0.198 10 false 1 1.948,1.646 2.104,1.844 0.156,0.198 10 false 7 4.729,0.844 4.979,1.042 0.25,0.198 10 false 12 4.729,1.688 5,1.885 0.271,0.198 10 false 13 0.552,2.719 1.698,3.073 1.146,0.354 10 false G171 0.563,2.885 1.75,3.125 1.188,0.24 10 false Engine Switch 5.052,2.688 6.104,2.99 1.052,0.302 10 false G170 5.052,2.854 6.573,3.333 1.521,0.479 10 false Certification ECU (Smart Key ECU Assembly) 6.604,1.677 6.917,1.875 0.313,0.198 10 false 29 6.396,1.771 6.708,1.969 0.313,0.198 10 false E

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 / Smart Key. 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, Gasoline Model)>HOW TO PROCEED WITH TROUBLESHOOTING

·

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

·

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



PROCEDURE

1.CHECK CONNECTION OF CONNECTOR
a.

Check that the connectors are properly connected to the engine switch and certification ECU (smart key ECU assembly).

OK:

Connectors are properly connected.



Result:
Proceed to
OK
NG



OK

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

NG

CONNECT CONNECTORS PROPERLY

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

Pre-procedure1

a.

Disconnect the G170 certification ECU (smart key ECU assembly) connector.


b.

Disconnect the G171 engine switch connector.


Procedure1

c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
G170-12 (ANT1) - G171-1 (ANT1) Always Below 1 Ω
G170-12 (ANT1) or G171-1 (ANT1) - Other terminals and body ground Always 10 kΩ or higher
G170-13 (ANT2) - G171-7 (ANT2) Always Below 1 Ω
G170-13 (ANT2) or G171-7 (ANT2) - Other terminals and body ground Always 10 kΩ or higher


Result:
Proceed to
OK
NG



Post-procedure1

d.

Connect the G170 certification ECU (smart key ECU assembly) connector.



OK

3.CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
a.

Using an oscilloscope, check the waveform.

B577589C07
4.76,0.354 5.156,0.635 0.396,0.281 4.021,2.177 4.188,2.177 4.188,2.177 4.583,1.26 true 4.271,2.385 4.438,2.385 4.438,2.385 4.948,1.177 true 5.052,1.167 5.563,2.469 5.563,2.469 5.771,2.469 true 0.156,0.208 0.469,0.365 0.313,0.156 10 false *a 4.25,3.542 4.563,3.698 0.313,0.156 10 false *c 4.104,4.292 4.563,4.49 0.458,0.198 10 false GND 5.844,2.375 6.458,2.573 0.615,0.198 10 false ANT1 3.875,2.313 4.49,2.51 0.615,0.198 10 false ANT2 3.865,2.083 4.479,2.281 0.615,0.198 10 false E 4.792,0.417 5.406,0.615 0.615,0.198 10 false G170 0.896,3.552 1.208,3.708 0.313,0.156 10 false *b 0.75,4.281 1.208,4.479 0.458,0.198 10 false GND
*a Component with harness connected
(Certification ECU (Smart Key ECU Assembly)) 		*b Waveform 1
*c Waveform 2 - -


OK:
Tester Connection Condition Tool Setting Specified Condition
G170-12 (ANT1) - G170-29 (E) Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed 5 V/DIV., 200 ms./DIV. Pulse generation
(See waveform 1)
G170-13 (ANT2) - G170-29 (E) Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of engine switch pressed 20 V/DIV., 200 ms./DIV. Pulse generation
(See waveform 2)


Result:
Proceed to
OK
NG




OK

REPLACE ENGINE SWITCH

for M20C-FKS:

Click hereEngine / Hybrid System>M20C-FKS (STARTING)>ENGINE SWITCH>REMOVAL

for M20D-FKS:

Click hereEngine / Hybrid System>M20D-FKS (STARTING)>ENGINE SWITCH>REMOVAL


NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)