Safety airbag-8
Internal failure determined by SRS-ECU
Serial
No.
List of failure Description of failure
1 Micro-controller
AD converter or EEPROM is faulty (the micro controller will be reset
and alarm lamp is light when the RAM has failure.)
2 Driver’s front airbag ignition loop
Enable the failure
Measure the failure of loop
3
Passenger front airbag ignition loop
(if realized)
Enable the failure
Measure the failure of loop
4
Seat safety belt preloaded ignition loop
(if realized)
Enable the failure
Measure the failure of loop
5
Passenger side safety belt preloaded
ignition loop (if realized)
Enable the failure
Measure the failure of loop
6
Driver’s side airbag ignition loop
(if realized)
Enable the failure
Measure the failure of loop
7
Passenger side airbag ignition loop
(if realized )
Enable the failure
Measure the failure of loop
8
Maximum times of explosion of safety
belt pre-tightener
Reach the maximum value 6
9
Holding time of ECU energy
(self-supply time)
Too short
10 Accelerometer
Deviation range
Sensor not in constant, stable model
Sensor tests the failure itself
11
The measurement of ignition loop is
rejected continuously
No cycling diagnosis test (duplicated calculation)
12 Safety sensor
Calculate the safety sensor open-loop using the method that power-off
for 2 or more than 2 seconds is considered as passing
13 Initial firing current All initial firing current in normal status when the front airbag releases.
14
The ignition of side airbag is not
determined.
Though SRS-ECU has received ignition information for 5 times during
HSIS cycling ignition, the ignition can not be determined due to the side
safety..
Debug the failure codes
Approach 1. The failure codes will be debugged following the ECU’s receipt from the X-431 diagnostic tester of the debugging
failure codes order through the serial interface, however, if an internal failure code is recorded or one impact is
recorded, the debugging will not be executed.
Approach 2. Ground 488# line for 5 times in 10 seconds to debug the failure codes.
Failure status display (alarm lamp keeps illuminating).
1. Bulb test
SRS-ECU will light the alarm lamp in order to test the bulb after working voltage is provided to it through the battery. The lamp
will flash for 6 times and then extinguish at 1HZ in the initial phase. The alarm lamp will keep illuminating after the working
voltage is provided in order to inform the driver’s system failures. The alarm lamp will keep illuminating for 6 seconds after the
ignition on and then be extinguished if the history-accumulated failures are less than five times. In the initial phase, SRS-ECU will
not prepare to test impact and stop release till the circuit is stable. Therefore, alarm lamp’s display manner will be one of
following projects in the initial phase. (Table 4.9).
Project 1. If the impact is recorded or the number of history accumulated failures is or more than 5,the alarm lamp will keep
illuminating, simultaneously, it will also keep illuminating if there is a possible explosion failure.
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