Nissan Sentra B18 (2020-2025) Service Manual: U0074 Control Module Comm Bus B Off

Nissan Sentra B18 (2020-2025) Service Manual / Driver Information & Multimedia / Audio, Visual & Navigation System :: Telematics System / Dtc/circuit Diagnosis / U0074 Control Module Comm Bus B Off

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
U0074-00	Control module comm Bus B Off (Control module communication bus B off)	Diagnosis condition	When ignition switch is ON
		Signal (terminal)	AV communication signal
		Threshold	Transmission or reception error
		Diagnosis delay time	1 second or more

POSSIBLE CAUSE

AV communication circuit

FAIL-SAFE

Telematics system 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 U0074–00 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 TCU POWER SUPPLY AND GROUND CIRCUIT
1. Check TCU power supply and ground circuit. Refer to Diagnosis Procedure.
Is the inspection result normal?
YES >>
GO TO 2.
NO >>
Repair or replace malfunctioning parts.

CHECK AV COMMUNICATION CIRCUIT (1)

Ignition switch OFF.
Disconnect the following connectors:
- AV control unit
- Bose speaker amp.
- Combination meter
- Around view monitor control unit
- Integral switch
- TCU
- Head up display unit

Check the continuity between AV control unit connector and TCU connector.

AV control unit		TCU		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M104	38	M160	26	Yes
	39		26
	58		27
	59		27

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Repair or replace harness or connector.

CHECK AV COMMUNICATION CIRCUIT (2)

Check the continuity between TCU connector terminals.

TCU			Continuity
Connector	Terminal		Continuity
M160	26	27	No

Is the inspection result normal?

YES>>

Replace TCU. Refer to Removal and Installation.

NO>>

Repair or replace harness or connector.

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