The SRS warning lamp will illuminate when :
The ignition is switched ON, the SRS warning lamp will be illuminated for approximately 5 seconds to indicate the system start-up sequence. During this period the SDM performs a system wiring and self check. If no system faults are detected, the SRS warning lamp will be switched OFF.
If communication is lost between the SDM and the instruments (for example SDM wiring harness YB190 disconnected or no BCM poll) the SRS warning lamp will be illuminated when the ignition is first switched ON, it will then be turned OFF for approximately 2 seconds and then commanded ON constantly until the fault is remedied (communication resumed) (No DTC will be set).
If battery voltage is below 9 volts or above 20 volts the SRS warning lamp will be illuminated and remain illuminated until the problem is resolved (No DTC will be set).
If the SRS is deployed, the SRS warning lamp will be illuminated until the problem is resolved (No DTC will be set).
If one or more current or history Diagnostic Trouble Codes (DTC's) are detected when the ignition is switched ON, the SRS warning lamp will illuminate and remain illuminated until the DTC is cleared. Additionally, 3 seconds after the ignition is switched ON, an audible warning chime will sound.
During an ignition cycle, if the SDM detects a current DTC, the SRS warning lamp will be illuminated. If during this cycle, the current DTC fault condition clears, a history DTC will be logged in the SDM and the SRS warning lamp will still remain illuminated.
When TECH 2 is communicating with the SDM, the SRS warning lamp will be illuminated and the SRS will be disabled.