Nissan Sentra B18 (2020-2025) Service Manual / Driver Information & Multimedia / Audio, Visual & Navigation System :: Telematics System / Dtc/circuit Diagnosis / B2e08 Microphone

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
1. CONSULT
  1. Ignition switch ON.
  2. Ignition switch OFF and wait at least 30 seconds.
  3. Ignition switch ON and wait at least 30 seconds or more.
  4. Select “Self Diagnostic Result” mode of “IVC”.
  5. 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	Continuity
M160	17	R17	1	Yes
M160	18	R17	4	Yes

Check the continuity between TCU connector and ground.

TCU		—	Continuity
Connector	Terminal	—	Continuity
M160	17	Ground	No
M160	18	Ground	No

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.)
M160	18	Ground	5 V

(+)

(−)

Voltage

(Approx.)

TCU

Connector

Terminal

M160

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
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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