Nissan Sentra B18 (2020-2025) Service Manual: B20dd-73 Ign Relay on Circ

Nissan Sentra B18 (2020-2025) Service Manual / Electrical & Power Control / Power Control System :: Ipdm E/r / Dtc/circuit Diagnosis / B20dd-73 Ign Relay on Circ

Dtc Description

DTC Description

The IPDM E/R operates the ignition relay-1 when it receives an ignition switch ON signal from the BCM via CAN communication.
Turn the ignition relay-1 OFF by pressing the push-button ignition switch once when the Nissan Sentra vehicle speed is 2.5 MPH (4 km/h) or less.
Turn the ignition relay-1 OFF with the following operation when the Nissan Sentra vehicle speed is more than 2.5 MPH (4 km/h) or when an abnormal condition occurs in CAN communication from the combination meter (emergency OFF):
- Press and hold the push-button ignition switch for 2 seconds or more.
- Press the push-button ignition switch 3 times within 1.5 seconds.

Note:

The ignition relay-1 does not turn ON for 3 seconds after emergency OFF even if the push-button ignition switch is pressed.

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)		DTC detection condition
B20DD-73	IGN RELAY ON CIRC (Ignition relay on circuit)	[ACTUATOR STUCK CLOSED]	Diagnosis condition	When ignition switch is OFF
			Signal (terminal)	CPU monitors the status at the contact and excitation coil circuits of the ignition relay-1 inside it
			Threshold	The ignition relay-1 ON is detected
			Diagnosis delay time	1 second or more

POSSIBLE CAUSE

IPDM E/R

FAIL-SAFE

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Dtc Confirmation Procedure

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE
1. CONSULT
  1. Ignition switch ON.
  2. Ignition switch OFF and wait for 1 second or more.
  3. Ignition switch ON.
  4. Select “Self Diagnostic Result” mode of “IPDM E/R”.
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 IGNITION RELAY-1 POWER SUPPLY CIRCUIT 1
1. CONSULT
  1. Ignition switch ON
  2. Select “Self Diagnostic Result” mode of “IPDM E/R”.
  3. Remove fuse [No. 88 (10A)] downstream of the ignition relay-1 in the IPDM E/R, and check the change in “Self Diagnostic Result”.
Is it now a past malfunction?
YES >>
Perform an inspection of the downstream circuit of fuse [No. 88 (10A)] in the IPDM E/R.
NO >>
GO TO 2.
CHECK IGNITION RELAY-1 POWER SUPPLY CIRCUIT 2
1. CONSULT
  1. Return fuse [No. 88 (10A)] downstream of the ignition relay-1 in the IPDM E/R back to the original position.
  2. Remove fuse [No. 87 (10A)] downstream of the ignition relay-1 in the IPDM E/R, and check the change in “Self Diagnostic Result”.
Is it now a past malfunction?
YES >>
Perform an inspection of the downstream circuit of fuse [No. 87 (10A)] in the IPDM E/R.
NO >>
GO TO 3.
CHECK IGNITION RELAY-1 POWER SUPPLY CIRCUIT 3
1. CONSULT
  1. Return fuse [No. 87 (10A)] downstream of the ignition relay-1 in the IPDM E/R back to the original position
  2. Remove fuse [No. 89 (10A)] downstream of the ignition relay-1 in the IPDM E/R, and check the change in “Self Diagnostic Result”.
Is it now a past malfunction?
YES >>
Perform an inspection of the downstream circuit of fuse [No. 89 (10A)] in the IPDM E/R.
NO >>
GO TO 4.
CHECK IGNITION RELAY-1 POWER SUPPLY CIRCUIT 4
1. CONSULT
  1. Return fuse [No. 89 (10A)] downstream of the ignition relay-1 in the IPDM E/R back to the original position
  2. Remove fuse [No. 91 (5A)] downstream of the ignition relay-1 in the IPDM E/R, and check the change in “Self Diagnostic Result”.
Is it now a past malfunction?
YES >>
Perform an inspection of the downstream circuit of fuse [No. 91 (5A)] in the IPDM E/R.
NO >>
GO TO 5.
CHECK IGNITION RELAY-1 POWER SUPPLY CIRCUIT 5
1. CONSULT
  1. Return fuse [No. 91 (5A)] downstream of the ignition relay-1 in the IPDM E/R back to the original position
  2. Remove fuse [No. 79 (20A)] downstream of the ignition relay-1 in the IPDM E/R, and check the change in “Self Diagnostic Result”.
Is it now a past malfunction?
YES >>
Perform an inspection of the downstream circuit of fuse [No. 79 (20A)] in the IPDM E/R.
NO >>
Replace IPDM E/R. Refer to Removal and Installation.

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