Warning lamp of airbag system malfunction «SRS», located in the instrument cluster, provides information about the state of the system on a test signal from the computer.
With some malfunctions, the system ECU loses its functionality and does not control the operation of the lamp. In such cases, the direct control of the lamp is carried out according to the appropriate circuit, which operates independently of the system ECU under the following conditions:
1. Lack of ignition voltage supply to the computer: the lamp is on with a constant light.
2. Lack of internal operating voltage: the lamp lights up permanently.
3. The system ECU is not connected: the lamp is turned on through the shorting jumper in the wiring connector.