S Nissan Sentra Manuals Library
Factory-style information for owners and repair work

Nissan Sentra techinfo

Find Nissan Sentra owner information, maintenance instructions, technical references, service procedures and useful repair pages in one clean online library.

Quick access Sentra Docs
B18 Owner's 2020-2025 Sentra owner information B18 Service 2020-2025 Sentra Workshop manual B17 Owner's 2013-2019 Sentra owner documentation B17 Service 2013-2019 Sentra service information

Nissan Sentra B18 (2020-2025) Service Manual: Hvac Branch Line Circuit

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK CONNECTOR

    1. Turn the ignition switch OFF.

    2. Disconnect the battery cable from the negative terminal.

    3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).

      • A/C auto amp. (With auto A/C)

      • A/C amp. (With manual A/C)

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Repair the terminal and connector.

  2. CHECK HARNESS FOR OPEN CIRCUIT

    1. Disconnect the following connectors.

      • A/C auto amp. (With auto A/C)

      • A/C amp. (With manual A/C)

    2. Check the resistance between the following harness connector terminals.

      • With auto A/C

        A/C auto amp. harness connector

        Resistance (Ω)

        Connector No.

        Terminal No.

        M34

        50

        70

        Approx. 54 – 66

      • With manual A/C

        A/C amp. harness connector

        Resistance (Ω)

        Connector No.

        Terminal No.

        M82

        50

        70

        Approx. 54 – 66

    Is the measurement value within the specification?

    YES >>

    GO TO 3.

    NO >>

    Repair the following.

    • A/C auto amp. branch line (With auto A/C)

    • A/C amp. branch line (With manual A/C)

  3. CHECK POWER SUPPLY AND GROUND CIRCUIT

    Check the power supply and the ground circuit of the A/C auto amp. (With auto A/C) or A/C amp. (With manual A/C). Refer to the following.

    • With automatic air conditioning: Diagnosis Procedure

    • With manual air conditioning: Diagnosis Procedure

    Is the inspection result normal?

    YES (Present error) >>

    Replace the A/C auto amp. (With auto A/C) or A/C amp. (With manual A/C). Refer to the following.

    • With automatic air conditioning: Removal and Installation

    • With manual air conditioning: Removal and Installation

    YES (Past error) >>

    Error was detected in the following.

    • A/C auto amp. branch line (With auto A/C)

    • A/C amp. branch line (With manual A/C)

    NO >>

    Repair the power supply and the ground circuit.

    A-Bag Branch Line Circuit
    Diagnosis Procedure Diagnosis Procedure Warning: Before servicing, turn ignition switch OFF, disconnect battery negative terminal, and wait 3 minutes or more. (To discharge back...
    Sonar Branch Line Circuit
    Diagnosis Procedure Diagnosis Procedure CHECK CONNECTOR Turn the ignition switch OFF. Disconnect the battery cable from the negative terminal. Check the following terminals and ...

    Other materials:

    Remote Engine Start
    The button is available on the NISSAN Intelligent Key when the Nissan Sentra is equipped with the Remote Engine Start system. This convenient feature allows the engine of the Nissan Sentra to be started from outside the vehicle, helping to pre-condition the cabin before driving. When ...

    Brake Drum. Inspection
    Inspection Inspection INSPECTION Appearance Check the surface of the brake drum for uneven wear, cracks, or damage. Replace the brake drum if any abnormal conditions exist. Refer to Removal and Installation. Brake Drum Inner Diameter Check the maximum inner diameter (B) of the bra ...

    Air Breather Hose
    Exploded View Exploded View 1. Air breather hose 2. Transaxle assembly A. ...