Nissan Leaf. Instruction — part 1125
B142A IGN VOLTAGE
SRC-101
< DTC/CIRCUIT DIAGNOSIS >
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B142A IGN VOLTAGE
Description
INFOID:0000000010877022
DTC B142A IGNITION VOLTAGE
Ignition voltage is supplied to the air bag diagnosis sensor unit when the ignition is in the ON position. The air
bag diagnosis sensor unit will monitor for low or high ignition voltage.
PART LOCATION
SRC-6, "Component Parts Location"
.
DTC Description
INFOID:0000000010877023
DTC DETECTION LOGIC
POSSIBLE CAUSE
[B142A–16]
• Malfunction of battery voltage (low voltage)
• Connection malfunction of harness or connector
• Internal malfunction of air bag diagnosis sensor unit
[B142A–17]
• Malfunction of battery voltage (high voltage)
• Connection malfunction of harness or connector
• 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-102, "Diagnosis Procedure"
YES (Past DTC)>>GO TO 2.
NO
>> Inspection End.
2.
ERASE SELF-DIAG RESULT
Erase the DTC using CONSULT.
Can the DTC be erased?
YES
>> Inspection End.
NO
>> Refer to
SRC-102, "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.
DTC
CONSULT screen items
(Trouble diagnosis content)
DTC detecting condition
B142A–16
IGNITION VOLTAGE
(Ignition voltage low)
[VB-LOW]
Power supply malfunction (low voltage) of air bag diagnosis sensor unit
B142A–17
IGNITION VOLTAGE
(Ignition voltage high)
[VB-HIGH]
Power supply malfunction (high voltage) of air bag diagnosis sensor unit
SRC-102
< DTC/CIRCUIT DIAGNOSIS >
B142A IGN VOLTAGE
Is the DTC detected?
YES
>> Refer to
SRC-102, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010877024
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
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.
RELATED HARNESS
Replace the related harness.
>> END
B142X COLLISION DETECTION
SRC-103
< DTC/CIRCUIT DIAGNOSIS >
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B142X COLLISION DETECTION
Description
INFOID:0000000010877025
DTC B1421 and B1422 COLLISION DETECTION
The air bag diagnosis sensor unit will set this DTC if it has detected a collision or rollover which has resulted in
a deployment of one or more air bags or pre-tensioners. If this DTC is detected after a SRS repair, the air bag
diagnosis sensor unit has not yet been replaced. This DTC can not be erased.
PART LOCATION
SRC-6, "Component Parts Location"
.
DTC Description
INFOID:0000000010877026
DTC DETECTION LOGIC
POSSIBLE CAUSE
[B1421–00]
• Malfunction of frontal-related parts
• Internal malfunction of air bag diagnosis sensor unit
[B1422–00]
• Malfunction of side-related parts
• Internal malfunction of air bag diagnosis sensor unit
FAIL-SAFE
—
DTC CONFIRMATION PROCEDURE (With CONSULT)
1.
INSPECTION START
Turn ignition switch ON.
>> GO TO 2.
2.
CHECK SELF-DIAG RESULT
Check for the DTC on CONSULT.
Is the DTC detected?
YES
>> Refer to
SRC-103, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010877027
SR-13, "For Frontal Collision"
SR-15, "For Side and Rollover Collision"
DTC
CONSULT screen items
DTC detecting condition
B1421–00
FRONTAL COLLISION DETECTION
Frontal collision detected. Driver and/or front passenger air bag modules are de-
ployed.
B1422–00
SIDE COLLISION DETECTION
Side collision detected. Curtain air bag module and seat belt pre-tensioner are
deployed.
SRC-104
< DTC/CIRCUIT DIAGNOSIS >
B14XX AIR BAG DIAGNOSIS SENSOR UNIT
B14XX AIR BAG DIAGNOSIS SENSOR UNIT
Description
INFOID:0000000010877028
DTC B14XX AIR BAG DIAGNOSIS SENSOR UNIT
The air bag diagnosis sensor unit will run self diagnostics when the ignition switch is turned ON. It has the
potential to set many diagnostic trouble codes which will conform to the B14XX format, but will not match any
other SRS diagnostic trouble codes. Refer to
.
PART LOCATION
SRC-6, "Component Parts Location"
.
DTC Description
INFOID:0000000010877029
DTC DETECTION LOGIC
POSSIBLE CAUSE
Malfunction in 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-105, "Diagnosis Procedure"
YES (Past DTC)>>GO TO 2.
DTC
CONSULT screen items
DTC detecting condition
B1400–00
CONTROL UNIT [UNIT MALFUNC]
Air bag diagnosis sensor unit is malfunctioning
B1401–00
B1402–00
B1403–00
B1404–00
B1405–00
B1406–00
B1407–00
B1408–00
B1409–00
B1410–00
B1411–00
B1412–00
B1413–00
B1414–00
B1415–00
B1416–00
B1417–00
B1418–00
B1419–00
B1420–00
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