Nissan Sentra B18 (2020-2025) Service Manual: B20d4-11 Tail Lamp Lh Pwr Sply Circ

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)		DTC detection condition
B20D4–11	TAIL LAMP LH PWR SPLY CIRC (Tail lamp left hand power supply circuit)	[CIRCUIT SHORT TO GROUND]	Diagnosis condition	When the parking lamp, license plate lamp, side marker lamp and tail lamp ON conditions are satisfied (Smart FET inside IPDM E/R is ON)
			Signal (terminal)	The following power supply circuit: Tail lamp LH Tail lamp RH License plate lamp LH License plate lamp RH Front side marker lamp LH Front side marker lamp RH
			Threshold	Overcurrent is detected
			Diagnosis delay time	1 second or less

POSSIBLE CAUSE

• Harness or connector

• Tail lamp LH (body side) bulb

• Tail lamp LH (body side) bulb socket or harness

• Tail lamp RH (body side) bulb

• Tail lamp RH (body side) bulb socket or harness

• Tail lamp LH (trunk lid side) bulb

• Tail lamp LH (trunk lid side) bulb socket or harness

• Tail lamp RH (trunk lid side) bulb

• Tail lamp RH (trunk lid side) bulb socket or harness

• License plate lamp LH bulb

• License plate lamp RH bulb

• Front combination lamp LH

  • LED (front side marker lamp)

• Front combination lamp RH

  • LED (front side marker lamp)

• IPDM E/R

FAIL-SAFE

Shuts off the power supply to the tail lamp (LH/RH) circuits until the parking lamp, license plate lamp, side marker lamp and tail lamp ON conditions are no longer satisfied.

Dtc Confirmation Procedure

DTC Confirmation Procedure

1. PRECONDITIONING

   1. CONSULT

      1. Ignition switch ON.

      2. Select “T LAMP LH CIRC MALFUNCTN” and “T LAMP RH CIRC MALFUNCTN” in “Data Monitor” mode of “IPDM E/R”.

      3. Check the monitor status.

         Monitor item	Monitor status
         T LAMP LH CIRC MALFUNCTN	0
         	1
         T LAMP RH CIRC MALFUNCTN	0
         	1

   What is the monitor status?

   “0”>>

   GO TO 2.

   “1”>>

   A short circuit is detected multiple times in the tail lamp LH, tail lamp RH, license plate lamp LH or license plate lamp RH power supply circuit, and damage accumulates at the Smart FET inside the IPDM E/R. For this reason, IPDM E/R does not turn ON the Smart FET. Because the DTC cannot be reproduced in this state, refer to DTC Diagnosis Procedure and replace IPDM E/R after the malfunctioning part is repaired. Refer to Removal and Installation.

2. PERFORM DTC CONFIRMATION PROCEDURE

   1. CONSULT

      1. Ignition switch OFF.

      2. Ignition switch ON.

      3. Turn lighting switch 1ST.

      4. Select “Self Diagnostic Result” mode of “IPDM E/R”.

      5. 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

1. CHECK TAIL LAMP POWER SUPPLY CIRCUIT (SHORT)

   1. 1. Ignition switch OFF.

      2. Disconnect the following connectors:

         • IPDM E/R

         • Front combination lamp LH

         • Front combination lamp RH

         • Rear combination lamp LH (body side)

         • Rear combination lamp LH (trunk lid side)

         • Rear combination lamp RH (body side)

         • Rear combination lamp RH (trunk lid side)

         • License plate lamp LH

         • License plate lamp RH

      3. Check continuity between IPDM E/R harness connector and ground.

         IPDM E/R		—	Continuity
         Connector	Terminal
         E47	4	Ground	No
         	17

   Is the inspection result normal?

   YES >>

   GO TO 2.

   NO >>

   Repair or replace harness.

2. CHECK TAIL LAMP POWER SUPPLY

   1. CONSULT

      1. Connect IPDM E/R connector.

      2. Ignition switch ON.

      3. Select “TAIL LAMP” in “Active Test” mode of “IPDM E/R”.

      4. With operating the test item, check voltage between rear combination lamp (body side) harness connector and ground.

         +			-	Test item		Voltage (Approx.)
         Rear combination lamp (body side)
         Connector		Terminal
         RH	B42	2	Ground	TAIL LAMP	On	Battery voltage
         					Off	0V
         LH	B25				On	Battery voltage
         					Off	0V

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   Replace IPDM E/R. Refer to Removal and Installation.

3. CHECK TAIL LAMP

   1. Check the tail lamp. Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   Repair or replace the malfunctioning part.

4. CHECK LICENSE PLATE LAMP

   1. Check the license plate lamp. Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Repair or replace the malfunctioning part.

5. CHECK FRONT SIDE MARKER LAMP

   1. Check the front side marker lamp. Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   Inspection End.

   NO >>

   Repair or replace the malfunctioning part.