The SRS malfunction indicator lamp (MIL) is located on the instrument cluster to provide information about SRS operating conditions.There are certain fault conditions in which the SRSCM (SRS Control Module) cannot function and thus cannot control the operation of the lamp. In these cases, the lamp is directly activated by circuitry that operates independently of the SRSCM, as follows :
Loss of ignition voltage supply to the SRSCM : lamp turns on continuously.
Loss of internal operating voltage : lamp turns on continuously.
SRSCM not connected : lamp turns on through shorting bar in wiring harness connector.
The SRS warning lamp is located on the cluster. When the airbag system is normal, the SRI flashes for approx. 6 seconds after the ignition switch is turned ON, and then turns off automatically. If there is a malfunction in the airbag system, the SRI stays on up to inform the driver of the abnormality. The SRSCM measures the voltage at the airbag SRI (Service Reminder Indicator) output pin, both when the lamp is on and when the lamp is off, to detect whetherthe requested state matches the actual state.
Item
Detecting Condition
Possible cause
DTC strategy
? Check voltage
? Short or short to battery in the warning lamp circuit
? Open, poor contact in the warning lamp
Case 1
Enable conditions
? Ignition "ON"
Threshold value
? 3.5V < VWL <4.5
Diagnosis time
Qualification
? More than 2 sec remaining
De-Qualification
? More than 10 sec remaining