Nissan Sentra. Instruction — part 795
DIAGNOSIS SYSTEM (AIR BAG)
SRC-15
< SYSTEM DESCRIPTION >
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DIAGNOSIS SYSTEM (AIR BAG)
Description
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CAUTION:
• Never use electrical test equipment on any circuit related to the SRS unless instructed in this Ser-
vice Instruction. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.
• Never repair, splice or modify the SRS wiring harness. If the harness is damaged, replace it with a
new one.
• Keep ground portion clean.
DIAGNOSIS FUNCTION
• The SRS self-diagnostic results can be read with air bag warning lamp and/or CONSULT.
• The user mode is exclusively prepared for the customer (driver). This mode warns the driver of a system
malfunction through the operation of the air bag warning lamp.
• The diagnosis mode allows the technician to locate and inspect the malfunctioning part.
• The mode applications for the air bag warning lamp and CONSULT are as per the following items.
×: Application, —: Not application
On Board Diagnosis Function
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ON-BOARD DIAGNOSIS
There are two self diagnosis functions with air bag warning lamp per the following items.
• USER MODE
• DIAGNOSIS MODE
METHOD OF STARTING
• Diagnosis mode changes from user mode to diagnosis mode when changing operation is performed.
• In user mode, when SRS air bag warning lamp is not turning ON, changing to diagnosis mode by ignition
switch operation is not possible.
• In diagnosis mode, when repair is complete and system is normal, the mode changes to user mode when
ignition switch is turned from OFF to ON.
Procedure to Change Diagnosis Mode
1. Turn ignition switch from OFF to ON.
2. SRS air bag lamp turns ON for 7 second and turns OFF, then turn ignition switch OFF within 2 second
after the lamp turns OFF.
NOTE:
When in Diagnosis Mode, the air bag warning lamp may illuminate for more than 7 seconds after the igni-
tion switch is turned ON. If this is the case, the ignition switch must still be cycled OFF after 7 seconds.
3. After turning ignition switch OFF, wait for 3 seconds or more.
4. Repeat operation 1 to 3 for 2 times so that operation 1 to 3 is repeated for 3 times in total.
5. Turn ignition switch from OFF to ON. Diagnosis mode changes.
USER MODE
In USER MODE, air bag warning lamp on combination meter turning ON when a malfunction is detected and
warns the customer (driver).
How to Read Air Bag Warning Lamp
1. Turn the ignition switch from OFF to ON, and check that the air bag warning lamp turns ON.
2. Compare the air bag warning lamp operation pattern with the examples.
Air Bag Warning Lamp Examples:
Diagnosis tool
User mode
Diagnosis mode
Air bag warning lamp
×
×
CONSULT
–
×
SRC-16
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (AIR BAG)
Air bag warning lamp flashing pattern (User Mode)
Trouble Diagnosis with CONSULT
INFOID:0000000009757933
1. Connect CONSULT.
2. DTC is displayed on SELF-DIAG RESULTS.
NOTE:
If a malfunction is not detected on SELF-DIAG RESULTS [CURRENT], but a malfunction is detected during
SRS Operation Check, the following cases may exist:
• SELF-DIAG [PAST] memory might not be erased. Refer to
.
• SRS system malfunctions intermittently. Refer to
SRC-42, "Inspection Procedure"
Warning lamp
SRS condition
Reference item
• No malfunction is detected.
• No further action is necessary.
—
The system is malfunctioning and
needs to be repaired.
Refer to
or
"Trouble Diagnosis without CON-
SULT"
.
Zero point reset is incomplete
Refer to
RESET : Special Repair Require-
ment"
• Air bag is deployed.
• Seat belt pre-tensioner is deployed.
or
SR-7, "For Side and Rollover Col-
.
• Air bag diagnosis sensor unit is mal-
functioning.
• Air bag power supply circuit is mal-
functioning.
• SRS air bag warning lamp circuit is
malfunctioning.
Refer to
.
• Air bag diagnosis sensor unit is mal-
functioning.
• Air bag warning lamp circuit is mal-
functioning.
Refer to
.
SHIA0011E
SHIA0012E
SHIA0013E
SHIA0014E
DIAGNOSIS SYSTEM (AIR BAG)
SRC-17
< SYSTEM DESCRIPTION >
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Trouble Diagnosis without CONSULT
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DIAGNOSIS MODE
NOTE:
Diagnosis Mode can not be entered if a malfunction is not detected in User Mode.
1. Turn ignition switch ON.
2. After AIR BAG warning lamp lights for 7 seconds, turn ignition switch OFF within 1 second.
3. Wait more than 3 seconds.
4. Repeat steps 1 to 3 two more times (3 times total).
5. Turn ignition switch ON.
SRS is now in Diagnosis Mode. Refer to
SRS History Check
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SRS HISTORY CHECK
1. Check repair history of the SRS. If no repairs have been made, perform
. If repairs have been made, GO TO step 2.
2. Erase ”SELF-DIAG [PAST]” after repair. Refer to
SRS Final Check
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DIAGNOSIS MODE
1. Connect CONSULT.
2. Confirm that zero point reset of OCS is complete.
3. If no DTCs are detected on “SELF-DIAG RESULTS [CURRENT]”, repair of SRS is completed. Go to step
4.
If any DTCs are detected on “SELF-DIAG RESULTS [CURRENT]”, the malfunction has not been repaired
completely or another malfunction is being detected. Perform SRS Operation Check again. Refer to
15, "On Board Diagnosis Function"
.
4. Touch “ERASE”.
NOTE:
Touching “ERASE” will clear the SRS memory of the malfunction (“SELF-DIAG [PAST]”). If “SELF-
DIAG [PAST]” is not erased, User Mode may show the previous system malfunction even if the
malfunction has been repaired completely.
5. Check that no malfunction is detected in “SELF-DIAG [PAST]”.
6. Exit Diagnosis Mode and disconnect the CONSULT.
7. Perform SRS Operation Check. Refer to
SRC-15, "On Board Diagnosis Function"
.
CONSULT Function (AIR BAG)
INFOID:0000000009757937
CONSULT can display each diagnostic item using the diagnostic test modes shown following.
CONSULT Function (OCCUPANT DETECTION)
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CONSULT can display each diagnostic item using the diagnostic test modes shown following.
Diagnostic Test Mode
Diagnostic Item
Description
Self Diagnostic Result
SELF-DIAG RESULT [CURRENT]
A current Self-diagnosis result (also indicated by the number of
warning lamp flashes in the Diagnosis mode) is displayed on the
CONSULT screen in real time. This refers to a malfunctioning part
requiring repairs.
Data Monitor
DATA MONITOR
Displays air bag diagnosis sensor unit input/output data in real time.
Ecu Identification
ECU DISCRIMINATED NO.
Air bag diagnosis sensor unit ECU discriminated number (identifica-
tion number) or part number is displayed. Air bag diagnosis sensor
unit has individual ECU discriminated number (identification num-
ber) or part number based on model and equipment.
Trouble Diagnostic Record
TROUBLE DIAG RECORD [PAST]
With TROUBLE DIAG RECORD, diagnosis results previously
erased by a reset operation can be displayed on the CONSULT
screen.
SRC-18
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (AIR BAG)
Diagnostic Test Mode
Diagnostic Item
Description
Work Support
ZERO POINT RESET FUNCTION
Perform zero point reset. Refer to
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