Nissan Sentra manuals

Nissan Sentra Service Manual: Dtc/circuit diagnosis

U1000 can comm circuit

DTC Logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Can comm circuit [u1000] Av control unit is not transmitting or receiving can communication signal for 2 seconds or more. CAN communication system.

Diagnosis Procedure

1.Perform self diagnostic result

  1. Turn ignition switch on and wait for 2 seconds or more.
  2. Perform self diagnostic result for multi av.

Is can comm circuit displayed? Yes >> refer to lan-16, "trouble diagnosis flow chart".

No >> refer to gi-39, "intermittent incident".

U1010 control unit (can)

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Control unit (can) [u1010] Error during CAN controller hardware initialization (VCAN). Replace the av control unit if the malfunction occurs constantly.

Refer to av-406, "removal and installation".

U1217 av control unit

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Bluetooth module [u1217] Connection failure to the internal blueoothВ® sub unit is detected. Replace AV control unit if malfunction occurs constantly.

Refer to AV-406, "Removal and Installation".

U1229 av control unit

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

iPod CERTIFICATION [U1229] Ipod authentication chip error. Replace av control unit if malfunction occurs constantly.

Refer to av-406, "removal and installation".

U122f av control unit

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Digital broadcasting connection error [u122f] Communication error with digital audio broadcast module internal to AV control unit. Replace av control unit if malfunction occurs constantly.

Refer to av-406, "removal and installation".

U1244 gps antenna

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Gps antenna conn [u1244] Open or short to ground is detected in gps antenna connection.
  • Gps antenna disconnection.
  • Open or short to ground in gps antenna signal circuit.

Diagnosis procedure

Regarding wiring diagram information, refer to av-331, "wiring diagram".

1.Gps antenna inspection

Visually inspect the gps antenna and antenna feeder. Refer to av-412, "location of antenna".

Is inspection result normal? Yes >> go to 2.

No >> repair or replace malfunctioning components.

2.Check av control unit voltage

  1. Turn ignition switch on.
  2. Check voltage between av control unit connector m116 terminal 50 and ground.

Is inspection result normal?


Is inspection result normal? YES >> Replace GPS antenna. Refer to AV-420, "Removal and Installation".

NO >> Replace AV control unit. Refer to AV-406, "Removal and Installation".

U1258 satellite radio antenna

DTC Lo

gic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Xm antenna conn [u1258] Open or short to ground is detected in satellite antenna connection.
  • Satellite antenna disconnection.
  • Open or short to ground in satellite antenna signal circuit.

Diagnosis Procedure

1.Satellite antenna inspection

Visually inspect the satellite antenna and antenna feeder. Refer to AV-412, "Location of Antenna".

Is inspection result normal? YES >> GO TO 2.

NO >> Repair or replace malfunctioning components.

2.Check satellite antenna feeder continuity

  1. Disconnect AV control unit connector M143 and satellite radio antenna connector M504.
  2. Check continuity between av control unit connector m143 and satellite radio antenna connector m504.


  1. Check continuity between av control unit connector m143 and ground.

Is the inspection result normal?


Is the inspection result normal? Yes >> go to 3

No >> repair or replace harness or connectors.

3.Check av control unit voltage

  1. Connect av control unit connector m143.
  2. Turn ignition switch ON.
  3. Check voltage between av control unit connector m143 terminal 52 and ground.

Is inspection result normal?


Is inspection result normal? Yes >> replace satellite radio antenna. Refer to av-419, "removal and installation".

No >> replace av control unit. Refer to av-406, "removal and installation".

U1263 usb

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Usb overcurrent [u1263] Overcurrent in usb harness is detected.
  • Device connected to usb interface.
  • Harness between the AV control unit and USB interface.

Dtc confirmation procedure

1.Perform self diagnostic result

  1. If there is a device connected to the usb interface, disconnect it.
  2. Turn ignition switch on and wait for 2 seconds or more.
  3. Perform Self Diagnostic Result for MULTI AV.

Is DTC U1263 displayed? YES >> Refer to AV-359, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis procedure

1.Check usb interface harness

Visually inspect usb interface harness. Refer to av-416, "removal and installation".

Is the inspection result normal? Yes >> go to 2.

No >> replace usb interface harness. Refer to av-416, "removal and installation".

2.Check usb interface harness

Check usb interface harness. Refer to av-391, "diagnosis procedure".

Is the inspection result normal? Yes >> replace av control unit. Refer to av-406, "removal and installation".

No >> replace usb interface harness. Refer to av-416, "removal and installation".

U1264 antenna amp

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

ANTENNA AMP TERMINAL [U1264] Open or short to ground is detected in antenna amp. Connection.
  • Antenna amp. Disconnection.
  • Open or short to ground in antenna amp. On signal circuit.

Diagnosis procedure

Regarding Wiring Diagram information, refer to AV-331, "Wiring Diagram".

1.Antenna amp. Inspection

Visually inspect the antenna amp. And antenna feeder. Refer to av-412, "location of antenna".

Is inspection result normal? Yes >> go to 2.

No >> repair or replace malfunctioning components.

2.Check continuity between av control unit and antenna amp.

  1. Turn ignition switch off.
  2. Disconnect av control unit connector m145 and antenna amp. Connector m502.
  3. Check continuity between av control unit connector m145 and antenna amp. Connector m502.


  1. Check continuity between av control unit connector m145 and ground.

Is the inspection result normal?


Is the inspection result normal? Yes >> go to 2.

No >> repair or replace harness or connectors.

3.Check av control unit voltage

  1. Connect av control unit connector m145.
  2. Turn ignition switch ON.
  3. Check voltage between av control unit connector m145 and ground.

Is the inspection result normal?


Is the inspection result normal? Yes >> replace antenna amp. Refer to av-419, "removal and installation".

No >> replace av control unit. Refer to av-406, "removal and installation".

Is the inspection result normal? Yes >> replace antenna amp. Refer to av-419, "removal and installation".

No >> replace av control unit. Refer to av-406, "removal and installation".

U1265 bose amp

DTC Logic

Consult display

Dtc detection condition

Possible cause

Amp on terminal [u1265] Open or short to ground is detected in bose amp. On signal circuit. Open or short to ground in bose amp. On signal circuit.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to AV-331, "Wiring Diagram".

1.Check continuity between av control unit and bose speaker amp.

  1. Turn ignition switch off.
  2. Disconnect av control unit connector m100 and bose speaker amp. Connector b43.
  3. Check continuity between av control unit connector m100 and bose speaker amp. Connector b43.


  1. Check continuity between av control unit connector m100 and ground.

Is the inspection result normal?


Is the inspection result normal? Yes >> go to 2.

No >> repair or replace harness or connectors.

2.Check av control unit voltage

  1. Connect AV control unit connector M100.
  2. Turn ignition switch ON.
  3. Check voltage between av control unit connector m100 and ground.

Is the inspection result normal? Yes >> go to 2.

No >> repair or replace harness or connectors.

2.Check av control unit voltage

  1. Connect AV control unit connector M100.
  2. Turn ignition switch on.
  3. Check voltage between av control unit connector m100 and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> Replace Bose speaker amp. Refer to AV-417, "Removal and Installation".

NO >> Replace AV control unit. Refer to AV-406, "Removal and Installation".

U12aa configuration error

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Configuration Error [U12AA] Av control unit is not properly configured or configuration is corrupt. Configuration data needs to be written.

Refer to AV-350, "CONFIGURATION (AV CONTROL UNIT) : Work Procedure".

Diagnosis procedure

1.Perform configuration

When u12aa is detected, configuration data must be written.

>> Write configuration data with consult. Refer to av-350, "configuration (av control unit) : work procedure".

U12ac av control unit

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Display Temperature too High [U12AC] Display temperature has exceeded maximum temperature. Display is switched off to avoid irreversible damage. Replace av control unit if malfunction occurs constantly.

Refer to av-406, "removal and installation".

U12ad av control unit

DTC Logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Ecu temperature too high [u12ad] Av control unit temperature has exceeded maximum temperature. Replace AV control unit if malfunction occurs constantly.

Refer to AV-406, "Removal and Installation".

U12ae av control unit

DTC Logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Internal amplifier temperature warning [u12ae] Internal amplifier temperature has exceeded maximum temperature. Replace av control unit if malfunction occurs constantly.

Refer to av-406, "removal and installation".

U12af av control unit

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

CD Mechanism Temperature Warning [U12AF] Cd drive temperature has exceeded maximum temperature. Cd drive is switched off to avoid irreversible damage. Replace av control unit if malfunction occurs constantly.

Refer to av-406, "removal and installation".

U12b0 power supply voltage

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Supply voltage goes below 9v > 20s [u12b0] Av control unit supply voltage exceeds lower limits.
  • Charging system malfunction.
  • Av control unit power supply or ground circuits.

Diagnosis procedure

1.Check charging system

Check the vehicle charging system. Refer to chg-14, "work flow (with exp-800 ni or gr8-1200 ni)" or chg-17, "work flow (without exp-800 ni or gr8-1200 ni)".

Is the inspection result normal? Yes >> go to 2.

No >> repair or replace the malfunctioning components.

2.Check av control unit power supply and ground circuits

Perform the AV control unit power supply and ground circuit diagnosis procedure. Refer to AV-370, "AV CONTROL UNIT : Diagnosis Procedure".

Is the inspection result normal? YES >> Replace the AV control unit. Refer to AV-406, "Removal and Installation".

NO >> Repair or replace harness or connectors.

U12b1 power supply voltage

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

Supply voltage goes high > 16v for 20s [u12b1] Av control unit supply voltage exceeds upper limits. Charging system malfunction.

Diagnosis procedure

1.Check charging system

Check the vehicle charging system. Refer to chg-14, "work flow (with exp-800 ni or gr8-1200 ni)" or chg-17, "work flow (without exp-800 ni or gr8-1200 ni)".

Is the inspection result normal? Yes >> replace the av control unit. Refer to av-406, "removal and installation".

No >> repair or replace the malfunctioning components.

U1310 av control unit

Dtc logic

Dtc detection logic

Consult display

Dtc detection condition

Possible cause

CONTROL UNIT (AV) [U1310] Error during CAN controller hardware initialization (MCAN). Replace av control unit if malfunction occurs constantly.

Refer to av-406, "removal and installation".

Basic inspection
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Other materials:

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