DTC B2784-1C: Antenna Coil Circuit Voltage Out of Range [11/2023 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.

CHECK CONNECTION OF CONNECTOR

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

Connectors are properly connected.

Result

Proceed to
OK
NG

Result:

CONNECT CONNECTORS PROPERLY

Result:

See step 2

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - POWER SWITCH AND BODY GROUND)

Pre-procedure1

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

Standard Resistance

Tester Connection	Condition	Specified Condition
H138-12 (ANT1) - H140-1 (ANT1)	Always	Below 1 Ω
H138-12 (ANT1) or H140-1 (ANT1) - Other terminals and body ground	Always	10 kΩ or higher
H138-13 (ANT2) - H140-7 (ANT2)	Always	Below 1 Ω
H138-13 (ANT2) or H140-7 (ANT2) - Other terminals and body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Post-procedure1

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 3

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Using an oscilloscope, check the waveform.

*a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))	*b	Waveform 1
*c	Waveform 2	-	-

Tester Connection	Condition	Tool Setting	Specified Condition
H138-12 (ANT1) - H138-29 (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 1)
H138-13 (ANT2) - H138-29 (E)	Ignition switch off, electrical key transmitter sub-assembly not in cabin, within 30 seconds of power switch pressed	20 V/DIV., 200 ms./DIV.	Pulse generation (See waveform 2)

Result

Proceed to
OK
NG

Result:

REPLACE POWER SWITCH. Refer to REMOVAL [11/2023 - ]

Result:

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [11/2023 - ]