Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026XCF |
Model Year Start: 2023 |
Model: Corolla |
Prod Date Range: [09/2022 -
] |
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): B27841C; Antenna Coil Circuit Voltage Out of Range; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] |
DTC
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B27841C
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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 power switch, the certification ECU (smart key ECU assembly) stores this DTC. This DTC is also stored as a history DTC.
DTC No.
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Detection Item
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DTC Detection Condition
|
Trouble Area
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Note
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B27841C
|
Antenna Coil Circuit Voltage Out of Range
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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*)
|
-
Power switch
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Certification ECU (smart key ECU assembly)
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Wire harness or connector
|
DTC output confirmation operation:
-
With the shift position in P and the electrical key transmitter sub-assembly held near the power switch, a hybrid control system start operation is performed by pressing and holding the power 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
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Fail-safe Operation when Malfunction Detected
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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
|
-
|
Related Data List and Active Test
DTC No.
|
Data List and Active Test
|
B27841C
|
-
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
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
|
OK
|
|
|
2.
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CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - POWER SWITCH AND BODY GROUND)
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(a) Disconnect the I167 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the I119 power switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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I167-12 (ANT1) - I119-1 (ANT1)
|
Always
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Below 1 Ω
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I167-12 (ANT1) or I119-1 (ANT1) - Other terminals and body ground
|
Always
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10 kΩ or higher
|
I167-13 (ANT2) - I119-7 (ANT2)
|
Always
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Below 1 Ω
|
I167-13 (ANT2) or I119-7 (ANT2) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
3.
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CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
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(a) Connect the I167 certification ECU (smart key ECU assembly) connector.
(b) Using an oscilloscope, check the waveform.
*a
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Component with harness connected
(Certification ECU (Smart Key ECU Assembly))
|
*b
|
Waveform
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OK:
Tester Connection
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Condition
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Tool Setting
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Specified Condition
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I167-12 (ANT1) - I167-29 (E)
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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)
|
I167-13 (ANT2) - I167-29 (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)
|
|