Nissan Sentra Service Manual: Power supply and ground circuit

Av control unit

Av control unit : diagnosis procedure

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

1.Check fuse

Check that the following fuses are not blown.

Are the fuses blown? Yes >> replace the blown fuse after repairing the affected circuit.

No >> go to 2.

2.Check power supply circuit

1. Turn ignition switch OFF.
2. Disconnect av control unit connectors m100 and m101.
3. Check voltage between AV control unit connectors M100 and M101 and ground.

Is the inspection result normal? YES >> GO TO 3.

NO >> Repair or replace harness or connectors.

3.Check ground circuit

1. Turn ignition switch off.
2. Check continuity between av control unit connector m100 and ground.

Is the inspection result normal? Yes >> inspection end.

No >> repair or replace harness or connectors.

Bose speaker amp

Bose speaker amp : diagnosis procedure

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

1.Check fuse

Check that the following fuses are not blown.

Are the fuses blown? YES >> Replace the blown fuse after repairing the affected circuit.

NO >> GO TO 2.

2.Check power supply circuit

1. Turn ignition switch off.
2. Disconnect bose speaker amp. Connector b44.
3. Check voltage between bose speaker amp. Connector b44 and ground.

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

No >> repair or replace harness or connectors.

3.Check ground circuit

1. Turn ignition switch off.
2. Disconnect bose speaker amp. Connector b44.
3. Check continuity between Bose speaker amp. connector B44 and ground.

Is the inspection result normal? Yes >> inspection end.

No >> repair or replace harness or connectors.

Front door speaker

Diagnosis procedure

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

1.Connector check

Check the av control unit, bose speaker amp. And speaker connectors for the following:

• Proper connection
• Damage
• Disconnected or loose terminals

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

No >> repair the terminals or connectors.

2.Check front door speaker signal circuit continuity (bose speaker amp.)

1. Disconnect bose speaker amp. Connector b43 and suspect front door speaker connector.
2. Check continuity between bose speaker amp. Connector b43 and suspect front door speaker connector.

3. Check continuity between bose speaker amp. Connector b43 and ground.

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

No >> repair or replace harness or connectors.

3.Check front door speaker signal (bose speaker amp.)

1. Connect bose speaker amp. Connector b43 and suspect front door speaker connector.
2. Turn ignition switch to ACC.
3. Push AV control unit POWER switch.
4. Check signal between the terminals of bose speaker amp. Connector b43.

Is the inspection result normal? YES >> Replace front door speaker. Refer to AV-408, "Removal and Installation".

NO >> GO TO 4

4.Check front door speaker signal circuit continuity (av control unit)

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

4. Check continuity between bose speaker amp. Connector b43 and ground.

Is the inspection result normal? Yes >> go to 5

No >> repair or replace harness or connectors.

5.Check front door speaker signal (av control unit)

1. Connect bose speaker amp. Connector b43 and av control unit connector m100.
2. Turn ignition switch to ACC.
3. Push av control unit power switch.
4. Check signal between av control unit connector m100 and ground.

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".

Front tweeter

Diagnosis procedure

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

1.Connector check

Check the av control unit, bose speaker amp. And speaker connectors for the following:

• Proper connection
• Damage
• Disconnected or loose terminals

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

No >> repair the terminals or connectors.

2.Check front speaker signal circuit continuity (bose speaker amp.)

1. Disconnect bose speaker amp. Connector b44 and suspect front speaker connector.
2. Check continuity between bose speaker amp. Connector b44 and suspect front speaker connector.

3. Check continuity between bose speaker amp. Connector b44 and ground.

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

No >> repair or replace harness or connectors.

3.Check front speaker signal (bose speaker amp.)

1. Connect bose speaker amp. Connector b44 and suspect front speaker connector.
2. Turn ignition switch to ACC.
3. Push av control unit power switch.
4. Check signal between the terminals of bose speaker amp. Connector b44.

Is the inspection result normal? Yes >> replace front tweeter. Refer to av-407, "removal and installation".

No >> go to 4

4.Check front speaker signal circuit continuity (av control unit)

1. Turn ignition switch to OFF.
2. Disconnect Bose speaker amp. connector B43 and AV control unit connector M100.
3. Check continuity between Bose speaker amp. connector B43 and AV control unit connector M100.

4. Check continuity between bose speaker amp. Connector b43 and ground.

Is the inspection result normal? Yes >> go to 5

NO >> Repair or replace harness or connectors.

5.Check front speaker signal (av control unit)

1. Connect bose speaker amp. Connector b43 and av control unit connector m100.
2. Turn ignition switch to ACC.
3. Push av control unit power switch.
4. Check signal between av control unit connector m100 and ground.

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".

Rear door speaker

Diagnosis procedure

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

1.Connector check

Check the AV control unit, Bose speaker amp. and speaker connectors for the following:

• Proper connection
• Damage
• Disconnected or loose terminals

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

No >> repair the terminals or connectors.

2.Check rear door speaker signal circuit continuity (bose speaker amp.)

1. Disconnect Bose speaker amp. connectors and suspect rear door speaker connector.
2. Check continuity between bose speaker amp. Connectors and suspect rear door speaker connector.

3. Check continuity between Bose speaker amp. connectors and ground.

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

NO >> Repair or replace harness or connectors.

3.Check rear door speaker signal (bose speaker amp.)

1. Connect Bose speaker amp. connectors and suspect rear door speaker connector.
2. Turn ignition switch to acc.
3. Push av control unit power switch.
4. Check signal between terminals of Bose speaker amp. connectors.

Is the inspection result normal? Yes >> replace rear door speaker. Refer to av-409, "removal and installation".

No >> go to 4

4.Check rear door speaker signal circuit continuity (av control unit)

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

4. Check continuity between bose speaker amp. Connector b43 and ground.

Is the inspection result normal? Yes >> go to 5

No >> repair or replace harness or connectors.

5.Check rear door speaker signal (av control unit)

1. Connect bose speaker amp. Connector b43 and av control unit connector m100.
2. Turn ignition switch to acc.
3. Push av control unit power switch.
4. Check signal between AV control unit connector M100 and ground.

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".

Rear woofer

Diagnosis procedure

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

1.Connector check

Check the av control unit, bose speaker amp. And speaker connectors for the following:

• Proper connection
• Damage
• Disconnected or loose terminals

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

No >> repair the terminals or connectors.

2.Check rear woofer signal circuit continuity (bose speaker amp.)

1. Disconnect Bose speaker amp. connector B44 and suspect rear woofer connector.
2. Check continuity between bose speaker amp. Connector b44 and suspect rear woofer connector.

3. Check continuity between bose speaker amp. Connector b44 and ground.

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

No >> repair or replace harness or connectors.

3.Check rear woofer signal (bose speaker amp.)

1. Connect bose speaker amp. Connector b44 and suspect rear woofer connector.
2. Turn ignition switch to acc.
3. Push av control unit power switch.
4. Check signal between terminals of Bose speaker amp. connector B44.

Is the inspection result normal? Yes >> replace rear woofer. Refer to av-410, "removal and installation".

No >> go to 4

4.Check rear woofer signal circuit continuity (av control unit)

1. Turn ignition switch to OFF.
2. Disconnect Bose speaker amp. connector B43 and AV control unit connector M100.
3. Check continuity between Bose speaker amp. connector B43 and AV control unit connector M100.

4. Check continuity between Bose speaker amp. connector B43 and ground.

Is the inspection result normal? YES >> GO TO 5

NO >> Repair or replace harness or connectors.

5.Check rear woofer signal (av control unit)

1. Connect Bose speaker amp. connector B43 and AV control unit connector M100.
2. Turn ignition switch to ACC.
3. Push AV control unit POWER switch.
4. Check signal between AV control unit connector M100 and ground.

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".

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.

4. Check continuity 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? Yes >> replace bose speaker amp. Refer to av-417, "removal and installation".

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

Rear view camera image signal circuit

Diagnosis procedure

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

1.Check reverse input signal

1. Turn ignition switch on.
2. Shift the selector lever to r (reverse).
3. Check voltage between AV control unit connector M101 and ground.

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

No >> repair or replace harness or connectors.

2.Check camera power supply circuit continuity

1. Turn ignition switch OFF.
2. Disconnect AV control unit connector M101 and rear view camera connector.
3. Check continuity between av control unit connector m101 and rear view camera connector b30.

4. Check continuity between av control unit connector m101 and ground.

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

No >> repair or replace harness or connectors.

3.Check camera power supply voltage

1. Connect AV control unit connector M101 and rear view camera connector.
2. Turn ignition switch on.
3. Shift the selector lever to R (reverse).
4. Check voltage between av control unit connector m101 and ground.

Is inspection result normal? Yes >> go to 4.

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

4.Check camera image signal circuit continuity

1. Turn ignition switch OFF.
2. Disconnect av control unit connector m101 and rear view camera connector.
3. Check continuity between AV control unit connector M101 and rear view camera connector B30.

4. Check continuity between av control unit connector m101 terminal 34 and ground.

Is inspection result normal? YES >> GO TO 5.

NO >> Repair or replace harness or connectors.

5.Check camera ground circuit continuity

Check continuity between av control unit connector m101 and rear view camera connector b30.

Is inspection result normal? Yes >> go to 6.

No >> repair or replace harness or connectors.

6.Check camera image signal

1. Connect av control unit connector m101 and rear view camera connector.
2. Turn ignition switch on.
3. Shift the selector lever to r (reverse).
4. Check signal between av control unit connector m101 and ground.

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

No >> replace rear view camera. Refer to av-422, "removal and installation".

Microphone signal circuit

Diagnosis procedure

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

1.Check microphone signal circuit continuity

1. Turn ignition switch off.
2. Disconnect av control unit connector m101 and microphone connector r4.
3. Check continuity between av control unit connector m101 and microphone connector r4.

4. Check continuity between AV control unit connector M101 and ground.

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

NO >> Repair or replace harness or connectors.

2.Check microphone vcc voltage

1. Connect AV control unit connector M101.
2. Turn ignition switch on.
3. Check voltage between terminals of av control unit connector m101.

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

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

3.Check microphone signal

1. Connect microphone connector.
2. Check signal between terminals of AV control unit connector M101.

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

No >> replace microphone. Refer to av-421, "removal and installation".

Steering switch

Diagnosis procedure

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

1.Check steering wheel audio control switch resistance

1. Turn ignition switch OFF.
2. Disconnect combination switch (spiral cable) connector M79.
3. Check resistance between the terminals of combination switch (spiral cable) connector m79.

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

No >> replace steering switches. Refer to av-411, "removal and installation".

2.Check combination switch (spiral cable)

Check continuity between combination switch (spiral cable) connectors m79 and m80.

Is the inspection result normal? YES >> GO TO 3.

NO >> Replace combination switch (spiral cable). Refer to SR-16, "Removal and Installation".

3.Check harness between combination switch (spiral cable) and av control uint

1. Disconnect AV control unit connector M100.
2. Check continuity between combination switch (spiral cable) connector M80 and AV control unit connector M100.

3. Check continuity between combination switch (spiral cable) connector m80 and ground.

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

No >> repair or replace harness or connectors.

Usb connector

Diagnosis procedure

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

1.Check usb interface harness continuity

1. Turn ignition switch off.
2. Disconnect AV control unit connector M114 and USB interface connector M132.
3. Check continuity between av control unit connector m114 and usb interface connector m132.

4. Check continuity between av control unit connector m131 and ground.

Is the inspection result normal? YES >> Replace the USB interface. Refer to AV-416, "Removal and Installation".

NO >> Repair or replace harness or connectors.

Auxiliary input jack

Diagnosis procedure

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

1.Check aux jack harness continuity

1. Turn ignition switch off.
2. Disconnect av control uint connector m101 and aux jack connector m133.
3. Check continuity between av control uint connector m101 and aux jack connector m133.

4. Check continuity between av control uint connector m101 and ground.

Is the inspection result normal? Yes >> replace the aux jack. Refer to av-416, "removal and installation".

No >> repair or replace harness or connectors.