Nissan Rogue (T33) 2021-Present Service Manual: Dtc/circuit Diagnosis :: B0021-1a Curtain A/b Module Lh

Nissan Rogue (T33) 2021-Present Service Manual / Restraints :: Srs Air Bag Control System / Dtc/circuit Diagnosis :: B0021-1a Curtain A/b Module Lh

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content) 		DTC Detection Condition
B0021-1A

CURTAIN A/B MODULE LH

(Left Curtain Deployment Control 1) 		Diagnosis condition When ignition switch is ON.
Signal (terminal) Curtain air bag module LH signal
Threshold Curtain air bag module LH circuits are shorted to each other
Diagnosis delay time 2 seconds or more.

POSSIBLE CAUSE

  • Connection malfunction or short circuit of harness and connector

  • Internal malfunction of curtain air bag module LH

  • Internal malfunction of air bag diagnosis sensor unit

FAIL-SAFE

—

DTC CONFIRMATION PROCEDURE

CHECK SELF DIAGNOSIS RESULT

CONSULT

  1. Ignition switch ON.

  2. Perform “Self diagnosis result” mode of “AIR BAG” using CONSULT.

Is malfunctioning part detected?

YES>>

Refer to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: Inspection End

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 unspecified tester or other measuring device.

CHECK HARNESS CONNECTOR

Check the harness connector.

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Replace harness connector.

CHECK WIRING HARNESS

Check the wiring harness externals.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Replace wiring harness.

REPLACE CURTAIN AIR BAG MODULE LH

  1. Replace curtain air bag module LH. Refer to Removal and Installation.

  2. Perform DTC confirmation procedure. Refer to DTC Description.

Is DTC detected?

YES>>

GO TO 4.

NO>>

Inspection End

REPLACE AIR BAG DIAGNOSIS SENSOR UNIT

  1. Replace air bag diagnosis sensor unit. Refer to Removal and Installation.

  2. Perform DTC confirmation procedure. Refer to DTC Description.

Is DTC detected?

YES>>

GO TO 1.

NO>>

Inspection End

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