Nissan Rogue (T33) 2021-Present Service Manual: Dtc/circuit Diagnosis :: U1ca8-02 Rear Seat Heater Rh Communication

Nissan Rogue (T33) 2021-Present Service Manual / Body Interior :: Seat / Dtc/circuit Diagnosis :: U1ca8-02 Rear Seat Heater Rh Communication

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content) 		DTC detection condition
U1CA8-02

REAR SEAT HEATER RH COMMUNICATION

(Rear seat heater RH 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 rear seat heater RH
Diagnosis delay time 2 seconds or more

POSSIBLE CAUSE

  • Fuse

  • Harness or connectors (rear seat heater RH circuit is open or short to ground)

  • Seat cushion heater RH

  • 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) 66 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 REAR SEAT HEATER RH POWER SUPPLY VOLTAGE

  1. Disconnect rear seat heater RH connector.

  2. Start the engine.

  3. Check voltage between rear seat heater RH harness connector and ground.

    + —

    Voltage

    (Approx.)
    Rear seat heater RH
    Connector Terminal
    B406 1 Ground Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair the harness or connector.

CHECK REAR SEAT HEATER RH GROUND CIRCUIT (OPEN)

  1. Ignition switch OFF.

  2. Check continuity between rear seat heater RH harness connector and ground.

    Rear seat heater RH — Continuity
    Connector Terminal
    B406 2 Ground Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair the harness or connector.

CHECK REAR SEAT HEATER RH LIN SIGNAL

  1. Ignition switch ON.

  2. Confirm output waveform between rear seat heater RH harness connector and ground with oscilloscope.

    + – Output waveform
    Rear seat heater RH
    Connector Terminal
    B406 3 Ground

Is the inspection result normal?

YES>>

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

NO>>

GO TO 5.

CHECK REAR SEAT HEATER RH LIN SIGNAL CIRCUIT (OPEN)

  1. Ignition switch OFF.

  2. Disconnect A/C amp. connector.

  3. Check continuity between rear seat heater RH harness connector and A/C amp. harness connector.

    Rear seat heater RH A/C amp. Continuity
    Connector Terminal Connector Terminal
    B406 3 M55 45 Yes

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair the harness or connector.

CHECK REAR SEAT HEATER RH LIN SIGNAL CIRCUIT (SHORT TO GROUND)

  1. Disconnect following connectors:

    • Front seat heater LH

    • Front seat heater RH

    • Rear seat heater LH

  2. Check continuity between rear seat heater RH harness connector and ground.

    Rear seat heater RH — Continuity
    Connector Terminal
    B406 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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