Nissan Sentra B18 (2020-2025) Service Manual: B20ce-15 Hl (hi) Lh Pwr Sply Circ

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)		DTC detection condition
B20CE-15	HL (HI) LH PWR SPLY CIRC [Headlamp (high) left hand power supply circuit]	[CIRC SHORT TO BATT OR OPEN]	Diagnosis condition	When headlamp (HI) ON conditions are satisfied (Smart FET inside IPDM E/R is ON)
			Signal (terminal)	Headlamp (HI) LH power supply and ground circuit
			Threshold	Circuit open or short to power supply are detected
			Diagnosis delay time	1 second or less

POSSIBLE CAUSE

• Harness or connector

• Headlamp (HI) LH bulb

• Headlamp (HI) LH bulb socket or harness

• IPDM E/R

FAIL-SAFE

—

Dtc Confirmation Procedure

DTC Confirmation Procedure

1. PRECONDITIONING

   1. CONSULT

      1. Ignition switch ON.

      2. Select “HL (HI) LH CIRC MALFUNCTN” in “Data Monitor” mode of “IPDM E/R”.

      3. Check the monitor status.

         Monitor item	Monitor status
         HL (HI) LH CIRC MALFUNCTN	0
         	1

   What is the monitor status?

   “0”>>

   GO TO 2.

   “1”>>

   A open or short circuit are detected multiple times in the headlamp (HI) LH power supply and ground 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 2ND, and lighting switch HI.

      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 HEADLAMP (HI) LH POWER SUPPLY 1 (SHORT TO POWER SUPPLY)

   1. 1. Ignition switch OFF.

      2. Turn lighting switch OFF.

      3. Disconnect IPDM E/R connector and front combination lamp LH connector.

      4. Check voltage between IPDM E/R harness connector and ground.

         IPDM E/R		—	Voltage (Approx.)
         Connector	Terminal
         E44	59	Ground	0V

   Is the inspection result normal?

   YES >>

   GO TO 2.

   NO >>

   Repair or replace harness.

2. CHECK HEADLAMP (HI) LH POWER SUPPLY 2

   1. CONSULT

      1. Connect IPDM E/R connector.

      2. Ignition switch ON.

      3. Turn lighting switch 2ND.

      4. Select “HEADLAMP (HI)” in “Active Test” mode of “IPDM E/R”.

      5. With operating the test item, check voltage between front combination lamp LH harness connector and ground.

         +		–	Test item		Voltage (Approx.)
         Front combination lamp LH
         Connector	Terminal
         E21	3	Ground	HEADLAMP (HI)	On	Battery voltage
         				Off	0V

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   GO TO 4.

3. CHECK HEADLAMP (HI) LH GROUND CIRCUIT

   1. 1. Ignition switch OFF.

      2. Turn lighting switch OFF.

      3. Check continuity between front combination lamp LH harness connector and ground.

         Front combination lamp LH		—	Continuity
         Connector	Terminal
         E21	2	Ground	Yes

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Repair or replace harness.

4. CHECK HEADLAMP (HI) LH POWER SUPPLY CIRCUIT

   1. 1. Ignition switch OFF.

      2. Turn lighting switch OFF.

      3. Disconnect IPDM E/R connector.

      4. Check continuity between IPDM E/R harness connector and front combination lamp LH harness connector.

         IPDM E/R		Front combination lamp LH		Continuity
         Connector	Terminal	Connector	Terminal
         E44	59	E21	3	Yes

   Is the inspection result normal?

   YES >>

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

   NO >>

   Repair or replace harness.

5. CHECK HEADLAMP (HI) LH

   1. Check the headlamp (HI) LH. Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   Inspection End.

   NO >>

   Repair or replace the malfunctioning part.