Daewoo MATIZ Service Manual page 847

8B – 20 SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
DRIVER FIRING CIRCUIT, SHORT TO BATTERY VOLTAGE
Circuit Description
When the ignition switch is turned ON, the sensing and
diagnostic module (SDM) will perform tests to diagnose
any malfunctions within itself.
After passing these tests, the SDM will check the driver
airbag module firing circuit. The SDM allows a very
small amount of current to flow through the circuit. The
SDM monitors voltage during this check.
DTC 04 Will Set When
D The firing circuit is shorted to voltage.
DIAGNOSTIC TROUBLE CODE (DTC) 04
Test Description
Caution: Before testing, disconnect the negative
battery cable. Wait 1 minute for the SDM capacitor
to discharge. The capacitor supplies reserve power
to deploy the airbags, even if the battery is discon-
nected. Unintentional deployment of the airbags
can cause injury.
D1AB302B
DAEWOO M-150 BL2