Description of On-Board Diagnostics
CAUTION:
Do not use electrical test equipment on any circuit related to the SRS unless instructed. SRS wiring harnesses are covered with yellow insulation Just before the harness connectors for easy identification.
Do not attempt to 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:
DIAGNOSIS FUNCTION
The SRS self-diagnosis results can be read by using the "AIR BAG" warning lamp and/or CONSULT. The reading of these results is accomplished using one of two modes - "User mode" and "Diagnosis mode". 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 follows:
DIAGNOSIS MODE FOR CONSULT
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 are not cleared until memory erasing is executed.
TROUBLE DIAG RECORD
With "TROUBLE DIAG RECORD", diagnosis results previously erased by a reset operation can be displayed on the CONSULT screen.
Diagnosis Mode For Consult:
ECU DISCRIMINATED NO.
The diagnosis sensor unit for each vehicle model is assigned with its own, individual classification number. This number will be displayed on the CONSULT screen, as shown. When replacing the diagnosis sensor unit, refer to the part number for the compatibility. After installation, replacement with a correct unit can be checked by confirming this classification number on the CONSULT screen.
NOTE: For NISSAN model R50, the diagnosis sensor unit classification number assigned is 41.
HOW TO CHANGE SELF DIAGNOSIS MODE WITH CONSULT
User Mode To Diagnosis Mode:
From User Mode To Diagnosis Mode
Touch "AIRBAG" on the "SELECT SYSTEM" screen. User mode automatically changes to Diagnosis mode.
Diagnosis Mode To User Mode:
From Diagnosis Mode To User Mode
Touch "BACK" key of CONSULT until "SELECT SYSTEM" appears, Diagnosis mode automatically changes to User mode.
HOW TO CHANGE SELF DIAGNOSIS MODE WITHOUT CONSULT
Air Bag Warning Lamp:
From User Mode to Diagnosis Mode
Diagnosis mode activates only when a malfunction is detected, by pressing the driver's door switch at least 5 times within 7 seconds after turning the ignition "ON". SRS will not enter Diagnosis mode, if no malfunction is detected.
From Diagnosis Mode to User Mode
After a malfunction is repaired, switch the ignition "OFF" for at least one second, then back "ON". Diagnosis mode is returned to the User mode. If switching Diagnosis mode to User mode is required while malfunction is being detected, switch the ignition "OFF", then back "ON" and press the driver's door switch at least 5 times within 7 seconds.
Checking SRS Operation By Using "AIR BAG" Warning Lamp - User Mode
Air Bag Warning Lamp:
1. After turning ignition switch from OFF to ON, "AIR BAG" warning lamp operates.
2. Compare "AIR BAG" warning lamp operation to the chart above.
NOTE: If "AIR BAG" warning lamp operates differently from the operations shown above, refer to "AIR BAG" warning lamp operation - DIAGNOSTIC PROCEDURE 6, step 4.