Geely CK MR479Q 2007, Workshop Manual

Page: 251 / 392

244
II. TEST INSTRUMENTS
III. TROUBLESHOOTING
1. Basic process of trouble diagnosis
DTC of the present fault may coexist with that of the history fault.
NOTICE:
After the new SRS ECU is installed, the warning light of the SRS, with the ignition switch ON, will be on
for 6s and then go out permanently, indicating SRS works normal. In this case, no service is needed.
Otherwise, system diagnosis and service shall be carried out.
If with the ignition switch ON, the warning light of the SRS is not on, the relevant circuits of the warning
light shall be serviced. Then go on with the operation and enable it to work.
2. Check SRS warning light
(1) Turn the ignition switch ON and find out whether the warning light is on.
(2) Six seconds after the process of ON-OFF, confirm that the warning light goes out permanently.
(3) Otherwise, diagnosis and checking have to be involved in.
3. System Diagnosis
The SRS ECU (HAE2.5) will perform a series of circular diagnostic tests to check the readiness of the SRS
functions. This test can avoid unexpected explosion of the restrain system and in the same time ensure the
necessary explosion in a crash. If a trouble is detected, the SRS ECU (HAE2.5) will store a proper DTC and
turn on the warning light indicating a trouble for service.
Instrument Designation Usage
Check system troubles of the SRS, and
clear the DTC of ECU
Diagnostic detector
(Hi-DS T Scan meter)
Special diagnostic meter
WL Remains
ON
Use scan meter and K line to
connect with Scan Meter ECU
Locate a
Trouble
Trouble-
shooting
C l e a r
DTC