Nissan Sentra B18 (2020-2025) Service Manual / Restraints / Srs Air Bag Control System :: Dtc/circuit Diagnosis / Air Bag (air Bag Diagnosis Sensor Unit) / B12b5-97 Frontal Collision Detection

Nissan Sentra B18 (2020-2025) Service Manual: B12b5-97 Frontal Collision Detection

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen items (Trouble diagnosis content)	DTC Detection Condition
B12B5-97	Frontal collision (Frontal collision)	Diagnosis condition	When ignition switch is ON.
		Signal (terminal)	Collision signal
		Threshold	Frontal collision detected
		Diagnosis delay time	2 seconds or more.

POSSIBLE CAUSE

Frontal collision

FAIL-SAFE

—

Confirmation Procedure

Confirmation Procedure

CHECK SELF DIAGNOSTIC RESULT
1. CONSULT
  1. Ignition switch ON.
  2. Select “Self Diagnostic Result” mode of “AIR BAG”.
  3. Check for DTC.
Is malfunctioning part 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

Warning:

Before servicing, ignition switch OFF, disconnect battery negative terminal, and wait at least 3 minutes or more (to discharge backup capacitor).

Never use an unspecified tester or other measuring device.

PERFORM COLLISION DIAGNOSIS
1. Perform collision diagnosis. Refer to For Frontal Collision.
>>
GO TO 2.
REPLACE AIR BAG DIAGNOSIS SENSOR UNIT
1. When DTC B12B5-97 is detected, replace air bag diagnosis sensor unit.
>>
Replace air bag diagnosis sensor unit. Refer to Removal and Installation.

 B107e-52 Air Bag Lock Mode

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