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An external watchdog can check the operation situation of the microcontroller. The failure of the microcontroller
can trigger the watchdog, which in turn can reset the microcontroller and turn on the warning light.
No. List of Troubles Trouble Description
1 Microcontroller
AD converter or EEPROM trouble (in
case of RAM and ROM failure, the
microcontroller will reset and the warning
light will light up.)
Activate trouble
Check the circuit trouble
Activate trouble
Check the circuit trouble
Activate trouble
Check the circuit trouble
Activate trouble
Check the circuit trouble
Activate trouble
Check the circuit trouble
Activate trouble
Check the circuit trouble
6 Ignition voltage
Low
7 Watchdog/reset
Trouble
8 Maximum times of explosion of the seat belt
pretensioner
6
9 Energy storage time (self-support time)
Short
Range of deviation
Sensor not in steady mode
Sensor selfcheck trouble
11 Continuous abortion of ignition circuit check
Nonexecution of circular diagnostic test
(Repeated algorithm calculation)
Close for 2 or more than 2 seconds
Safety sensor is open circuit when
calculating the trouble with algorithm
13 Ignition current
All the ignition currents are normal
when the current SRS is deployed
14 No confirmation of side SRS ignition
Even if the SRS ECU (HAE2.5) have
received for 5 times the ignition information
during the HSIS ignition cycle, the side SRS
airbag ignition can not be verified by SRS
ECU (HAE2.5).
Seat belt pretensioner ignition circuit (if realized)
5 Passenger seat belt pretensioner ignition circuit
(if realized)
2 Passenger airbag ignition circuit
3 Passenger airbag ignition circuit (if realized)
[Table] Internal troubles predicted by SRS ECU (HAE2.5)
10 Accelerometer
12 Safety sensor
6 Driver airbag ignition circuit (if realized)
7 Passenger airbag ignition circuit (if realized)
4
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