Daewoo MATIZ Service Manual page 887

8B – 60 SUPPLEMENTAL INFLATABLE RESTRAINTS (SIR)
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 warn-
ing lamp circuit. The SDM constantly measures the volt-
age at the warning lamp output in order to determine if
the lamp is ON or OFF at the correct time.
DTC 25 Will Set When
D The lamp is ON when it should be OFF.
D The lamp is OFF when it should be ON.
Diagnostic Aids
When the warning lamp operates correctly, the warning
lamp turns ON for approximately four seconds after the
ignition is first switched ON, and then The warning lamp
turns OFF.
DIAGNOSTIC TROUBLE CODE (DTC) 25
WARNING LAMP FAILURE
When the warning lamp operates incorrectly, the warn-
ing lamp continues to blink four times per second,
demonstrating that the SDM is faulty and must be re-
placed.
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: If the short is in the supplemental inflatable
restraints (SIR) wiring harness, do not attempt to re-
pair it. The repair might create a high-resistance
connection which can keep the airbags from deploy-
ing when needed, resulting in injury. Replace the
SIR wiring harness if it is damaged.
D1AB301B
DAEWOO M-150 BL2