Nissan Murano: Heater & Air Conditioning Control System :: Dtc/circuit Diagnosis / B2796 Fr Sw Comm Error

Nissan Murano (Z52) 2015-2024 Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Dtc/circuit Diagnosis / B2796 Fr Sw Comm Error

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms

(Trouble diagnosis content)
DTC detection condition
B2796

FR SW COMM ERROR

(Front switch communication error)
Diagnosis condition When ignition switch is ON.
Signal (terminal) -
Threshold -
Diagnosis delay time 2 seconds or more

POSSIBLE CAUSE

  • A/C switch assembly

  • A/C auto amp.

  • Harness and connector (Communication line is open or shorted)

FAIL-SAFE

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE

CONSULT

  1. Ignition switch ON.

  2. Select “Self Diagnostic Result” mode of “HVAC”.

  3. Check DTC.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO>>

Inspection End.

DTC Diagnosis Procedure

CHECK COMMUNICATION SIGNAL CIRCUIT (A/C AUTO AMP. → A/C SWITCH ASSEMBLY) FOR OPEN

  1. Ignition switch OFF.

  2. Disconnect A/C switch assembly connector and A/C auto amp. connector.

  3. Check continuity between A/C switch assembly harness connector and A/C auto amp. harness connector.

    A/C switch assembly A/C auto amp. Continuity
    Connector Terminal Connector Terminal
    M142 12 M50 24 Yes

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair harness or connector.

CHECK COMMUNICATION SIGNAL CIRCUIT (A/C AUTO AMP. → A/C SWITCH ASSEMBLY) FOR SHORT

Check continuity between A/C switch assembly harness connector and ground.

A/C switch assembly Continuity
Connector Terminal
M142 12 Ground No

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair harness or connector.

CHECK COMMUNICATION SIGNAL CIRCUIT (A/C SWITCH ASSEMBLY → A/C AUTO AMP.) FOR OPEN

Check continuity between A/C switch assembly harness connector and A/C auto amp. harness connector.

A/C switch assembly A/C auto amp. Continuity
Connector Terminal Connector Terminal
M142 11 M50 4 Yes

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair harness or connector.

CHECK COMMUNICATION SIGNAL CIRCUIT (A/C SWITCH ASSEMBLY → A/C AUTO AMP.) FOR SHORT

Check continuity between A/C switch assembly harness connector and ground.

A/C switch assembly Continuity
Connector Terminal
M142 11 Ground No

Is the inspection result normal?

YES>>

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

NO>>

Repair harness or connector.

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