TELEMATICS SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC B2A04 MIC CIRCUIT
Diagnosis start condition:
When ACC is ON.
DTC detecting condition:
Any of the followings continues for 1 second or more.
• MIC impedance is more than 10 k?. (Detached MIC, etc.)
• MIC impedance is less than 10 ?. (Short-circuited MIC, etc.)
Trouble symptom:
• Call function cannot be used.
• RED LED illuminates.
Wiring diagram:
NOTE:
For the coupling connector, refer to “WIRING SYSTEM”.
Telematics Telematics System > WIRING DIAGRAM">
CAUTION:
CommCheck is required after replacing the DCM. Telematics System > OPERATION">
STEP | CHECK | YES | NO |
1.CHECK DTC.
Read the DTC. Diagnostic Code(s) Display">
Is DTC B2A04 displayed? (Current malfunction)
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A04 MIC CIRCUIT">Go to Step 2.
Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
2.CHECK HARNESS (OPEN CIRCUIT).
1) Turn the ignition switch to OFF.
2) Disconnect the microphone connector.
3) Disconnect the DCM connector.
4) Measure the resistance between microphone connector and DCM connector.
Connector & terminal
With sunroof and without EyeSight
(R56) No. 7 — (i271) No. 14:
(R56) No. 8 — (i271) No. 8:
(R56) No. 9 — (i271) No. 6:
Without sunroof and without EyeSight
(R56) No. 4 — (i271) No. 14:
(R56) No. 5 — (i271) No. 8:
(R56) No. 6 — (i271) No. 6:
With EyeSight
(R405) No. 4 — (i271) No. 6:
(R405) No. 3 — (i271) No. 8:
(R405) No. 5 — (i271) No. 14:
Is the resistance 1 ? or less?
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A04 MIC CIRCUIT">Go to Step 3.
Repair or replace the open circuit of harness.
3.CHECK HARNESS (GROUND SHORT CIRCUIT).
Measure the resistance between DCM connector and chassis ground.
Connector & terminal
(i271) No. 8 — Chassis ground:
(i271) No. 14 — Chassis ground:
(i271) No. 6 — Chassis ground:
Is the resistance 1 M? or more?
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A04 MIC CIRCUIT">Go to Step 4.
Repair or replace the short circuit of the harness.
4.CHECK THE CONNECTOR (SHORT CIRCUIT TO POWER SUPPLY).
Measure the voltage between DCM connector and chassis ground.
Connector & terminal
(i271) No. 8 (+) — Chassis ground (−):
(i271) No. 14 (+) — Chassis ground (−):
(i271) No. 6 (+) — Chassis ground (−):
Is the voltage less than 1 V?
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A04 MIC CIRCUIT">Go to Step 5.
Repair or replace the short circuit of the harness.
5.CHECK MICROPHONE.
Confirm the microphone voice input.
Is the voice input OK?
Replace the DCM. Data Communication Module">
Replace the microphone. Microphone">
Most common causes of corrosion
The most common causes of corrosion
are:
The accumulation of moisture retaining
dirt and debris in body panel sections,
cavities, and other areas.
Damage to paint and other protective
coatings caused by gravel and stone
chips or minor accidents.
Corrosion is accelerated on the vehic ...
Dtc b1828 short in side airbag lh (to +b)
AIRBAG SYSTEM (DIAGNOSTICS) > Diagnostic Chart with Trouble CodeDTC B1828 SHORT IN SIDE AIRBAG LH (TO +B)Diagnosis start condition:Ignition voltage is 10 V to 16 V.DTC detecting condition:• Side airbag harness (LH) is shorted to power supply.• Side airbag module (LH) is faulty.• ...
Safety tips regarding the BSD/RCTA approach indicator light/warning buzzer
In the following cases, operation of the
BSD/RCTA approach indicator light and
the warning buzzer may be delayed or the
system may fail to issue these warnings.
When a vehicle moves to the
neighboring lane from a lane next to
the neighboring lane
When driving on a steep incline or
on ...