Description and Operation

Warning Lamp Activation

Warning Lamp Behavior After Ignition ON

As soon as operating voltage is supplied to the SRSCM ignition input, the SRSCM activates the warning lamp for a lamp check. The lamp should illuminate for 6 seconds during the initialization phase and then turn off. To warn the driver, the warning lamp should illuminate for 6 seconds and turn off for 1 second, then remain on continuously after operating voltage is supplied if an active fault exists.

1. 1
   The active fault counter or historical fault counter is greater than or equal to 10.

   

2. 2
   The normal or historical fault counter is less than 10.

   

3. 3
   When the ignition is turned on in End-of-Line (EOL) variant coding mode, the airbag warning lamp illuminates and flashes at 1-second intervals until coding is completed. If variant coding is completed normally, the airbag warning lamp illuminates for 6 seconds and then turns off. Otherwise, the airbag warning lamp flashes continuously at 1-second intervals.

   1. If variant coding is completed normally

      

   2. If variant coding is not completed.

      

   If an active fault exists in the airbag system or an internal SRSCM fault is present, End-of-Line (EOL) variant coding cannot be completed. In this case, repeat the variant coding (EOL) procedure after troubleshooting the fault using GDS.
4. 4
   SRSCM battery power loss: The warning lamp remains on continuously.
5. 5
   Loss of internal operating voltage: warning lamp remains on continuously.
6. 6
   Microprocessor malfunction: The warning lamp remains on continuously.
7. 7
   SRSCM not connected: warning lamp remains on continuously.

Independent Activation of the SRSCM Warning Lamp: There are certain failure conditions under which the SRSCM cannot function and therefore cannot control the standard warning lamp. In these cases, the standard warning lamp is activated directly by the relevant circuit, which operates independently of the SRSCM. These cases are: Warning Lamp Activation. The warning lamp indicates the passenger airbag (PAB) on/off status based on the occupant status in the passenger seat. If the passenger seat is empty or occupied by a child (or child seat), the passenger airbag is turned off and the warning lamp illuminates to inform the driver that the PAB is off. As soon as operating voltage is supplied to the SRSCM ignition input, the SRSCM activates the warning lamp. The OCS sends the defect status to the SRSCM as the default setting for passenger airbag deployment during the test period. Occupant status information and warning lamp status are shown in the table below.

Occupant Status	Warning Lamp	PAB
Empty	ON	Underweight
Child (Small Occupant)	ON	Underweight
Adult (Large Occupant)	OFF	Enabled
Defect	OFF	Enabled

After the ignition is turned on, the warning lamp illuminates for 4 seconds and turns off for 4 seconds during the initialization phase, then remains off until the first valid suppression message is received from the OCS system.