Nissan Sentra B18 (2020-2025) Service Manual: B2e08 Microphone
Dtc Description
DTC Description
DTC DETECTION LOGIC
|
DTC No. |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
||
|---|---|---|---|---|
|
B2E08–01 |
Microphone (Microphone) |
1 |
Diagnosis condition |
When ignition switch is ON. |
|
Signal (terminal) |
Microphone signal |
|||
|
Threshold |
7.2 V or more |
|||
|
Diagnosis delay time |
1 second or more |
|||
|
2 |
Diagnosis condition |
When ignition switch is ON. |
||
|
Signal (terminal) |
Microphone signal |
|||
|
Threshold |
0.2 V or less |
|||
|
Diagnosis delay time |
1 second or more |
|||
POSSIBLE CAUSE
-
Microphone signal circuit short to power supply
-
Microphone signal circuit short to ground
-
Microphone
FAIL-SAFE
Microphone does not operate
Confirmation Procedure
Confirmation Procedure
-
PERFORM DTC CONFIRMATION PROCEDURE
-
CONSULT-
Ignition switch ON.
-
Ignition switch OFF and wait at least 30 seconds.
-
Ignition switch ON and wait at least 30 seconds or more.
-
Select “Self Diagnostic Result” mode of “IVC”.
-
Check DTC.
-
Is DTC B2E08–01 detected?
YES>>Proceed to DTC Diagnosis Procedure.
NO>>To check malfunction symptom before repair: Refer to Intermittent Incident.
NO>>Confirmation after repair: Inspection End.
-
Dtc Diagnosis Procedure
DTC Diagnosis Procedure
-
CHECK MICROPHONE SIGNAL CIRCUIT AND MICROPHONE VCC CIRCUIT CONTINUITY
-
-
Ignition switch OFF.
-
Disconnect TCU connector and microphone connector.
-
Check continuity between TCU connector and microphone connector.
TCU
Microphone
Continuity
Connector
Terminal
Connector
Terminal
M160
17
R17
1
Yes
18
4
-
Check the continuity between TCU connector and ground.
TCU
—
Continuity
Connector
Terminal
M160
17
Ground
No
18
-
Is the inspection result normal?
YES >>GO TO 2.
NO >>Repair or replace harness or connectors.
-
-
CHECK MICROPHONE VCC VOLTAGE
-
-
Connect TCU connector and microphone connector.
-
Ignition switch ON.
-
Check voltage between TCU connector and ground.
(+)
(−)
Voltage
(Approx.)
TCU
Connector
Terminal
M160
18
Ground
5 V
-
Is the inspection result normal?
YES >>GO TO 3.
NO >>Replace TCU. Refer to Removal and Installation.
-
-
CHECK MICROPHONE SIGNAL
-
Check signal between TCU connector and ground.
(+)
(−)
Condition
Reference value
TCU
Connector
Terminal
M160
17
Ground
Speak into microphone.

Is the inspection result normal?
YES >>Replace TCU. Refer to Removal and Installation.
NO >>Replace microphone. Refer to Removal and Installation.
-
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