Daewoo MATIZ Service Manual page 873

8B – 46 SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
CONNECTION BETWEEN DRIVER FIRING CIRCUIT AND DRIVER
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 and the driver pretensioner circuit. The SDM al-
lows a very small amount of current to flow through the
circuit. The SDM monitors the circuit resistance during
this check.
DTC 18 Will Set When
D Connection between the driver firing circuit and the
driver pretensioner circuit or the SDM internal con-
nection problem may exist.
DIAGNOSTIC TROUBLE CODE (DTC) 18
PRETENSIONER CIRCUIT
Open Circuit
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.
Caution: Never measure the resistance of an airbag
module. If the anti-deployment shorting bar on the
module-side of the connector is not working prop-
erly, the meter's battery can deploy the airbag and
cause injury.
D1AB302B
DAEWOO M-150 BL2