Nissan Sentra B18 (2020-2025) Service Manual: B24d4-08 A/c Control Comm

Nissan Sentra B18 (2020-2025) Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Automatic Air Conditioner / Dtc/circuit Diagnosis / B24d4-08 A/c Control Comm

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
B24D4-08	A/C CONTROL COMM (A/C control communication)	Diagnosis condition	Ignition switch ON
		Signal (Terminal)	LIN (A/C control) signal
		Threshold	Receive internal circuit error message from A/C switch assembly via LIN communication
		Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

Fuse
Harness and connector (A/C switch assembly circuit is open or shorted)
A/C switch assembly
A/C auto amp.

FAIL-SAFE

—

Confirmation Procedure

Confirmation Procedure

PERFORM SELF DIAGNOSTIC RESULT
1. 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 >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO >>
Confirmation after repair: Inspection End.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK FUSE

Ignition switch OFF.

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

Component	Location	Fuse No.	Capacity
A/C switch assembly	Fuse block (J/B)	6	10 A

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 A/C SWITCH ASSEMBLY POWER SUPPLY

Disconnect A/C switch assembly connector.
Ignition switch ON.

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

+	-	Voltage (Approx.)
M59	5	Ground	Battery voltage

Voltage

(Approx.)

A/C switch assembly

Connector

Terminal

M59

Ground

Battery voltage

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

Repair harness or connector between A/C switch assembly and fuse.

CHECK A/C SWITCH ASSEMBLY GROUND CIRCUIT FOR OPEN

Ignition switch OFF.

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

A/C switch assembly		—	Continuity
Connector	Terminal	—	Continuity
M59	7	Ground	Yes

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

Repair harness or connector.

CHECK A/C SWITCH ASSEMBLY LIN SIGNAL

Connect A/C switch assembly connector.
Ignition switch ON.

Confirm output waveform between A/C switch assembly harness connector and ground with oscilloscope.

+		-
A/C switch assembly
Connector	Terminal
M59	8	Ground

Is the inspection result normal?

YES >>

Replace A/C switch assembly. Refer to Removal and Installation.

NO >>

GO TO 5.

CHECK LIN COMMUNICATION SIGNAL CIRCUIT FOR OPEN

Ignition switch OFF.
Disconnect A/C switch assembly connector and A/C auto amp. connector.

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	Continuity
M59	8	M34	68	Yes

Is the inspection result normal?

YES >>

GO TO 6.

NO >>

Repair harness or connector.

CHECK LIN COMMUNICATION SIGNAL CIRCUIT FOR SHORT

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

A/C switch assembly		—	Continuity
Connector	Terminal	—	Continuity
M59	8	Ground	No

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

+	-	Voltage (Approx.)
M59	8	Ground	0 V

Voltage

(Approx.)

A/C switch assembly

Connector

Terminal

M59

Ground

0 V

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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