Nissan Maxima. Manual - part 1096

SRC-12

< SYSTEM DESCRIPTION >

ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Trouble Diagnosis Introduction

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CAUTION:

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to do so in

this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harness con-

nectors.

• Do not attempt to repair, splice or modify SRS wiring harnesses. If a harness is damaged, replace it

with a new one.

• Keep ground connections clean.

DIAGNOSIS FUNCTION

The SRS self-diagnosis results can be read by using “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 mal-

function 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 follows:

HOW TO PERFORM TROUBLE DIAGNOSES FOR QUICK AND ACCURATE REPAIR

A good understanding of the malfunction conditions can make troubleshooting faster and more accurate.

In general, each customer feels differently about a malfunction. It is important to fully understand the symp-

toms or conditions for a customer complaint.

Information From Customer

WHAT - Vehicle model

WHEN - Date, Frequencies

WHERE - Road conditions

HOW - Operating conditions, Symptoms

Preliminary Check

Check that the following parts are in good order.

• Battery

• Fuse

• System component-to-harness connections

SRS Operation Check

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DIAGNOSTIC PROCEDURE 1

Checking SRS Operation Using “AIR BAG” Warning Lamp—User Mode

1. Turn the ignition switch from OFF to ON, and check that the air bag warning lamp blinks.
2. Compare the SRS air bag warning lamp blinking pattern with the

examples.

User mode

Diagnosis mode

Display type

“AIR BAG” warning lamp

X

X

ON-OFF operation

CONSULT

—

X

Monitoring

BF-1845D

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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SRS Air bag warning lamp examples

DIAGNOSTIC PROCEDURE 2

1. Connect CONSULT.
2. Diagnostic code is displayed on "SELF-DIAG [CURRENT]".

If no malfunction is detected on "SELF-DIAG [CURRENT]", but malfunction is detected in "SRS Operation

Check" using the "AIR BAG" warning lamp, the following cases may exist:

• "SELF-DIAG [PAST]" memory might not be erased.

• The SRS system malfunctions intermittently.

Perform DIAGNOSTIC PROCEDURE 4. Refer to 

SRC-14, "Self-Diagnosis Function (Without CON-

SULT)"

.

“AIR BAG” warning lamp (User mode)

SRS condition

Reference item

• No malfunction is detected.
• No further action is necessary.

—

The system is malfunctioning and 
needs to be repaired as indicated.

Proceed to DIAGNOSTIC PROCE-
DURE 2 that follows (with CON-
SULT) or 

SRC-14, "Trouble 

Diagnosis without CONSULT"

 (with-

out CONSULT).

• Air bag is deployed.
• Seat belt pre-tensioner is deployed.

Proceed to COLLISION DIAGNO-
SIS 

SR-5, "FOR USA AND CANA-

DA : For Frontal Collision"

 or 

SR-7, 

"FOR USA AND CANADA : For Side 
and Rollover Collision"

.

• 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 

SRC-80, ""AIR BAG" Warn-

ing Lamp Does Not Turn Off"

.

• Air bag diagnosis sensor unit is mal-

functioning.

• Air bag warning lamp circuit is mal-

functioning.

Refer to 

SRC-80, ""AIR BAG" Warn-

ing Lamp Does Not Turn On"

.

SHIA0011E

SHIA0012E

SHIA0013E

SHIA0014E

SRC-14

< SYSTEM DESCRIPTION >

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Trouble Diagnosis without CONSULT

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DIAGNOSTIC PROCEDURE 6

Inspect SRS Malfunction Using "AIR BAG" Warning Lamp—Diagnosis Mode

NOTE:

SRS will not enter Diagnosis mode if no malfunction is 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 

SRC-56, "Trouble Diagnosis without CONSULT"

.

CONSULT Function (AIR BAG)

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CONSULT can display each diagnostic item using the diagnostic test modes shown.

Self-Diagnosis Function (Without CONSULT)

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• The reading of these results is accomplished using one of two modes —“User mode” and “Diagnosis mode”.

• After a malfunction is repaired, turn the ignition switch OFF for at least one second, then back ON. Diagnosis

mode returns to the User mode. At that time, the self-diagnostic result is cleared.

AIR BAG diagnostic mode

Description

SELF-DIAG [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.

SELF-DIAG [PAST]

Diagnosis results previously stored in the memory are displayed on the CONSULT screen. The stored 
results will remain until memory erasing is executed.

TROUBLE DIAG RECORD

With TROUBLE DIAG RECORD, diagnosis results previously erased by a reset operation can be dis-
played on the CONSULT screen.

ECU DISCRIMINATED NO.

Air bag diagnosis sensor unit ECU discriminated number (identification number) or part number is dis-
played.  Air bag diagnosis sensor unit has individual ECU discriminated number (identification number) 
or part number based on model and equipment.

PASSENGER AIR BAG

The STATUS (readiness) of the front passenger air bag module is displayed.  The STATUS displayed 
(ON/OFF) depends on the signals supplied to the occupant classification system control unit and air 
bag diagnosis sensor unit. Refer to 

SRC-10, "Occupant Classification System (OCS)"

 for more infor-

mation.

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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HOW TO CHANGE SELF-DIAGNOSIS MODE 

DIAGNOSTIC PROCEDURE 3

Final Check of SRS Using CONSULT - Diagnosis Mode

1. Connect CONSULT.
2. If no DTC is detected on “SELF-DIAG [CURRENT]”, repair of SRS is completed. Go to step 3.

If any DTC is detected on “SELF-DIAG [CURRENT]”, the malfunctioning part has not been repaired com-

pletely or another malfunctioning part is being detected. Perform DIAGNOSTIC PROCEDURE 2. Refer to

SRC-12, "SRS Operation Check"

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3. Touch “ERASE”.

NOTE:

Touch “ERASE” to clear the memory of the malfunction (“SELF-DIAG [PAST]”).

If the memory of the malfunction in “SELF-DIAG [PAST]” is not erased, the User mode shows the system

malfunction by the operation of the warning lamp even if the malfunction is repaired completely.

4. Touch “BACK” key of CONSULT.  Touch “SELF-DIAG [PAST]”.
5. Check that no malfunction is detected on “SELF-DIAG [PAST]”.
6. Touch “BACK” key of CONSULT to return to User mode from Diagnosis mode.
7. Turn ignition switch OFF and then turn off and disconnect CONSULT.
8. Go to 

SRC-12, "SRS Operation Check"

.

DIAGNOSTIC PROCEDURE 4

Check SRS Repair History

1.

CONSIDER POSSIBILITY THAT SELF-DIAGNOSTIC RESULT WAS NOT ERASED AFTER REPAIR

Check repair history of the SRS.
Have any previous repairs been made to the SRS?

Yes

>> Self-diagnostic result “SELF-DIAG [PAST]” (previously stored in the memory) might not be erased

after repair. Perform DIAGNOSTIC PROCEDURE 3. Refer to 

SRC-14, "Self-Diagnosis Function

(Without CONSULT)"

.

No

>> Perform DIAGNOSTIC PROCEDURE 2. Refer to 

SRC-12, "SRS Operation Check"

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