Daewoo MATIZ Service Manual page 879

8B – 52 SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
CONNECTION BETWEEN PASSENGER FIRING CIRCUIT AND PASSENGER
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
passenger airbag and the passenger circuit. The SDM
allows a very small amount of current to flow through the
circuit. The SDM monitors the circuit resistance during
this check.
DTC 21 Will Set When
D Connection between the passenger firing circuit and
the passenger pretensioner circuit or SDM internal
connection problem may exist.
DIAGNOSTIC TROUBLE CODE (DTC) 21
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