AIR BAG SYSTEM WARNING ALARM
id081000500400
Purpose
• The air bag system warning alarm notifies the driver that a malfunction occurred in the air bag system instead of the air bag system warning light.
Function
• If a malfunction occurs in the air bag system while the air bag system warning light cannot illuminate, the air bag system warning alarm sounds.
• If all of the following conditions are met, the SAS control module sends the air bag system warning alarm request signal to the instrument cluster.
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― SAS control module detects DTC B00D2:29 (air bag system warning light (during communication related malfunction))
― SAS control module detects DTCs other than DTC B00D2:29 (Except for air bag system warning light does not illuminate DTC)
• When the instrument cluster receives the air bag system warning alarm request signal sent from the SAS control module via the CAN signal, the air bag system warning alarm sounds.
• The air bag system warning alarm sound pattern is as shown in the figure.
Construction
• The air bag system warning alarm sounds a buzzer in the instrument cluster.
Operation
1. When the ignition is switched ON (while engine is stopped or running), the instrument cluster receives (1) the air bag system warning alarm request signal from the SAS control module.
2. The instrument cluster microcomputer turns the transistor on (2) based on the air bag system warning alarm request signal.
3. When the transistor turns on, the ground circuit of the alarm is established and the alarm sounds (3).
Fail-safe
• Function not equipped.
