Nissan Sentra B18 (2020-2025) Service Manual: C1f03-72 Stop Lamp Relay

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
C1F03	72	STOP LAMP RLY FIX (Stop lamp relay fixation)	Diagnosis condition	When engine is running When AEB system is ON
			Signal (terminal)	—
			Threshold	Stop lamp inactive state despite the outputting of a stop lamp request signal from ADAS control unit 2
			Diagnosis delay time	1 second or less

POSSIBLE CAUSE

• BCM

• ADAS control unit 2

FAIL-SAFE

The following systems are canceled.

• Nissan Sentra Vehicle-to-vehicle distance control mode

• Conventional (fixed speed) cruise control mode

• AEB

• RAB

Confirmation Procedure

Confirmation Procedure

1. CHECK DTC PRIORITY

   If DTC “C1F03-72” is displayed with Network-DTC, first diagnose the Network-DTC.

   Is applicable DTC detected?

   YES >>

   Perform diagnosis of applicable. DTC Index

   NO >>

   GO TO 2 .

2. PERFORM DTC CONFIRMATION PROCEDURE

   1. Start the engine.

   2. Turn the AEB system ON

   3. Perform “All DTC Reading”.

   4. Check if the “C1F03-72” is detected as the current malfunction in the “Self Diagnostic Result” of “ICC/ADAS 2”.

   Is “C1F03-72” detected as the current malfunction?

   YES >>

   DTC Diagnosis Procedure

   NO-1 >>

   To check malfunction symptom before repair: Intermittent Incident

   NO-2 >>

   Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

1. CHECK DTC PRIORITY

   If DTC “C1F03-72” is displayed with Network-DTC, first diagnose the Network-DTC.

   Is applicable DTC detected?

   YES >>

   Perform diagnosis of applicable. DTC Index

   NO >>

   GO TO 2.

2. PERFORM SELF-DIAGNOSIS OF BCM

   Check if any DTC is detected in “Self Diagnostic Result” of “BCM”.

   Is any DTC detected?

   YES >>

   Repair or replace the malfunctioning parts identified by the self-diagnosis result. DTC Index

   NO >>

   Replace ADAS control unit 2. Removal and Installation