Flow of Diagnosis

A good understanding of the malfunction conditions can make troubleshooting faster and more accurate. In general, each customer feels differently about a problem. It is important to fully understand the symptoms 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

DIAGNOSIS FUNCTION
The SRS self-diagnosis results can be read by using "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 (also indicated by the warning lamp flashes in the User mode) are displayed on the CONSULT screen.The stored results are not erased 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.





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 model U13, the diagnosis sensor unit classification number assigned is 42.

CAUTION:
- Do not use a circuit tester to check SRS harness connectors unless instructed to in this Service Manual.SRS wiring harnesses are covered with yellow insulation either just before the harness connectors or for the complete harness, 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.





WORK FLOW