Nissan Rogue (T33) 2021-Present Service Manual: Dtc/circuit Diagnosis :: U1ca7-02 Front Seat Heater Lh Communication

Nissan Rogue (T33) 2021-Present Service Manual / Body Interior :: Seat / Dtc/circuit Diagnosis :: U1ca7-02 Front Seat Heater Lh Communication

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content) 		DTC detection condition
U1CA7-02

FRONT SEAT HEATER LH COMMUNICATION

(Front seat heater LH communication) 		Diagnosis condition Engine running
Signal (terminal) LIN (heated seat) signal (terminal #45)
Threshold A/C amp. is not transmitting or receiving LIN communication with front seat heater LH
Diagnosis delay time 2 seconds or more

POSSIBLE CAUSE

  • Fuse

  • Harness or connectors (front seat heater LH circuit is open or short to ground)

  • Seat cushion heater LH

  • A/C amp.

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

  1. Start the engine.

  2. Select “Self diagnosis result” mode of “HVAC”.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: Inspection End.

DTC Diagnosis Procedure

CHECK FUSE

  1. Ignition switch OFF.

  2. Check that the following fuse is not blown (open):

    Unit Location Fuse No. Capacity
    Ignition switch power supply Fuse block (J/B) 67 30A

Is the fuse blown (open)?

YES>>

Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).

NO>>

GO TO 2.

CHECK FRONT SEAT HEATER LH POWER SUPPLY VOLTAGE

  1. Disconnect front seat heater LH connector.

  2. Start the engine.

  3. Check voltage between front seat heater LH harness connector and ground.

    + -

    Voltage

    (Approx.)
    Front seat heater LH
    Connector Terminal
    B204 1 Ground Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK FRONT SEAT HEATER LH GROUND CIRCUIT (OPEN)

  1. Ignition switch OFF.

  2. Check continuity between front seat heater LH harness connector and ground.

    Front seat heater LH — Continuity
    Connector Terminal
    B204 2 Ground Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair the harness or connector.

CHECK FRONT SEAT HEATER LH LIN SIGNAL

  1. Ignition switch ON.

  2. Confirm output waveform between front seat heater LH harness connector and ground with oscilloscope.

    + – Output waveform
    Front seat heater LH
    Connector Terminal
    B204 3 Ground

Is the inspection result normal?

YES>>

Replace seat cushion heater LH. Refer to Disassembly and Assembly.

NO>>

GO TO 5.

CHECK FRONT SEAT HEATER LH LIN SIGNAL CIRCUIT (OPEN)

  1. Ignition switch OFF.

  2. Disconnect A/C amp. connector.

  3. Check continuity between front seat heater LH harness connector and A/C amp. harness connector.

    Front seat heater LH A/C amp. Continuity
    Connector Terminal Connector Terminal
    B204 3 M55 45 Yes

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair the harness or connector.

CHECK FRONT SEAT HEATER LH LIN SIGNAL CIRCUIT (SHORT TO GROUND)

  1. Disconnect following connectors:

    • Front seat heater RH

    • Rear seat heater LH

    • Rear seat heater RH

  2. Check continuity between front seat heater LH harness connector and ground.

    Front seat heater LH — Continuity
    Connector Terminal
    B204 3 Ground No

Is the inspection result normal?

YES>>

Replace A/C amp. Refer to Removal and Installation.

NO>>

Repair the harness or connector.

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