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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.

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