Nissan Leaf. Manual - part 1114

B0020 SIDE AIRBAG MODULE LH

SRC-57

< DTC/CIRCUIT DIAGNOSIS >

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SRC

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Is DTC still current?

YES

>> GO TO 5.

NO

>> Refer to 

GI-53, "Intermittent Incident"

.

5.

AIR BAG DIAGNOSIS SENSOR UNIT

1. Replace the air bag diagnosis sensor unit. Refer to 

SR-38, "Removal and Installation"

.

2. Turn ignition switch ON.

3. Check for DTC using CONSULT.
Is DTC still current?

YES

>> GO TO 6.

NO

>> Clear DTC. Inspection End.

6.

SIDE AIR BAG MODULE LH

1. Replace the side air bag module LH. Refer to 

SR-32, "Removal and Installation"

.

2. Turn ignition switch ON.

3. Check for DTC using CONSULT.
Is DTC still current?

YES

>> GO TO 7.

NO

>> Clear DTC. Inspection End.

7.

RELATED HARNESS

Replace the related harness.

>> END

SRC-58

< DTC/CIRCUIT DIAGNOSIS >

B0021 SIDE CURTAIN AIR BAG MODULE LH

B0021 SIDE CURTAIN AIR BAG MODULE LH

Description

INFOID:0000000010876980

DTC B0021 LH SIDE CURTAIN AIR BAG MODULE

The LH side curtain air bag module is wired to the air bag diagnosis sensor unit. The air bag diagnosis sensor

unit will monitor for opens and shorts in detected lines to the LH side curtain air bag module.

PART LOCATION

Refer to 

SRC-6, "Component Parts Location"

.

DTC Description

INFOID:0000000010876981

DTC DETECTION LOGIC

POSSIBLE CAUSE

[B0021–09, B0021–1A]

• 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

[B0021–11]

• Connection malfunction or short circuit to ground of harness and connector

• Internal malfunction of curtain air bag module LH

• Internal malfunction of air bag diagnosis sensor unit

[B0021–12]

• Connection malfunction or short circuit to power supply of harness and connector

• Internal malfunction of curtain air bag module LH

• Internal malfunction of air bag diagnosis sensor unit

[B0021–13]

• Connection malfunction or open 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 (With CONSULT)

1.

CHECK SELF-DIAG RESULT

1. Turn ignition switch ON.

2. Check for DTC using CONSULT.
Is the DTC detected?

YES (Current DTC)>>Refer to 

SRC-59, "Diagnosis Procedure"

.

YES (Past DTC)>>GO TO 2.

NO

>> Inspection End.

2.

ERASE SELF-DIAG RESULT

Erase the DTC using CONSULT.

DTC

CONSULT screen items

(Trouble diagnosis content)

DTC detecting condition

B0021–09

CURTAIN A/B MODULE LH 
[Left Curtain Deployment 
Control 1 (Subfault)]

[SHORT]

Curtain air bag module LH circuits are shorted to each other

B0021–11

[GND-SHORT]

Curtain air bag module LH circuit is shorted to ground

B0021–12

[VB-SHORT]

Curtain air bag module LH circuit is shorted to power supply circuit

B0021–13

[OPEN]

Curtain air bag module LH circuit is open

B0021–1A

[SHORT]

Curtain air bag module LH circuits are shorted to each other

B0021 SIDE CURTAIN AIR BAG MODULE LH

SRC-59

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SRC

N

O

P

Can the DTC be erased?

YES

>> Inspection End.

NO

>> Refer to 

SRC-59, "Diagnosis Procedure"

.

DTC CONFIRMATION PROCEDURE (Without CONSULT)

1.

CHECK SELF-DIAG RESULT

1. Turn ignition switch ON.

2. Check the air bag warning lamp status. Refer to 

SRC-11, "On Board Diagnosis Function"

.

NOTE:

SRS will not enter diagnosis mode if no malfunction is detected in user mode.
Is the DTC detected?

YES

>> Refer to 

SRC-59, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010876982

1.

HARNESS CONNECTOR

Visually inspect all applicable harness connectors for the following:

• Visible damage to connector or terminal

• Loose terminal

• Poor connection

NOTE:

All harness connectors should be inspected from the air bag diagnosis sensor unit to the end component

(including any in-line connectors).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform one of the following repairs:

• Visible damage: Replace the harness.

• Loose terminal: Secure the terminal.

• Poor connection: Secure the connection.

2.

CONFIRM DTC

1. Reconnect all harness connectors.

2. Turn ignition switch ON.

3. Check for DTC using CONSULT.
Is DTC still current?

YES

>> GO TO 3.

NO

>> Refer to 

GI-53, "Intermittent Incident"

.

3.

WIRING HARNESS

Check the wiring harness for visible damage.

NOTE:

The entire wiring harness should be inspected from the air bag diagnosis sensor unit to the end component

(including any in-line connectors).
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace the harness.

4.

CONFIRM DTC

1. Reconnect all harness connectors.

2. Turn ignition switch ON.

3. Check for DTC using CONSULT.
Is DTC still current?

YES

>> GO TO 5.

NO

>> Refer to 

GI-53, "Intermittent Incident"

.

5.

AIR BAG DIAGNOSIS SENSOR UNIT

SRC-60

< DTC/CIRCUIT DIAGNOSIS >

B0021 SIDE CURTAIN AIR BAG MODULE LH

1. Replace the air bag diagnosis sensor unit. Refer to 

SR-38, "Removal and Installation"

.

2. Turn ignition switch ON.

3. Check for DTC using CONSULT.
Is DTC still current?

YES

>> GO TO 6.

NO

>> Clear DTC. Inspection End.

6.

SIDE CURTAIN AIR BAG MODULE LH

1. Replace the side curtain air bag module LH. Refer to 

SR-29, "Removal and Installation"

.

2. Turn ignition switch ON.

3. Check for DTC using CONSULT.
Is DTC still current?

YES

>> GO TO 7.

NO

>> Clear DTC. Inspection End.

7.

RELATED HARNESS

Replace the related harness.

>> END