DESCRIPTION
When an open or short circuit is detected in the transponder key amplifier coil built into the power 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 power switch is open (see below) or shorted (determined by communication with certification ECU (smart key ECU assembly)). (1 trip detection logic*) |
| DTC output confirmation operation:
|
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
---|---|
Hybrid control system cannot be started when transmitter battery is depleted by holding electrical key transmitter sub-assembly near power switch and pressing and holding power switch with shift position in P |
- |
DTC No. | Data List and Active Test |
---|---|
B27841C | - |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Start Key(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.
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PROCEDURE
1. | CHECK CONNECTION OF CONNECTOR |
(a) Check that the connectors are properly connected to the power switch and certification ECU (smart key ECU assembly).
OK:
Connectors are properly connected.
NG | ![]() | CONNECT CONNECTORS PROPERLY |
|
2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - POWER SWITCH AND BODY GROUND) |
(a) Disconnect the I222 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the I280 power switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
---|---|---|
I222-12 (ANT1) - I280-1 (ANT1) |
Always | Below 1 Ω |
I222-12 (ANT1) or I280-1 (ANT1) - Other terminals and body ground |
Always | 10 kΩ or higher |
I222-13 (ANT2) - I280-7 (ANT2) |
Always | Below 1 Ω |
I222-13 (ANT2) or I280-7 (ANT2) - Other terminals and body ground |
Always | 10 kΩ or higher |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Connect the I222 certification ECU (smart key ECU assembly) connector.
(b) Using an oscilloscope, check the waveform.
*a | Component with harness connected (Certification ECU (Smart Key ECU Assembly)) |
*b | Waveform |
OK:
Tester Connection | Condition |
Tool Setting | Specified Condition |
---|---|---|---|
I222-12 (ANT1) - I222-29 (E) |
Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power switch pressed |
5 V/DIV., 200 ms./DIV. |
Pulse generation (See waveform) |
I222-13 (ANT2) - I222-29 (E) |
Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power switch pressed |
5 V/DIV., 200 ms./DIV. |
Pulse generation (See waveform) |
OK | ![]() | REPLACE POWER SWITCH |
NG | ![]() | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |