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Circuit Description

WARNING: This page is about a different car, the 2005 Suzuki Swift +, 2005 Pontiac Wave, and 2005 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.

When the SDM recognizes ignition voltage greater than 9 volts at terminal A1 of the SDM, the air bag indicator flashes 7 times to verify operation. At this time the SDM performs turn-on tests followed by resistance measurement tests and continuous monitoring tests.

When a malfunction is detected, the SDM sets a current DTC and illuminates the air bag indicator.

When the malfunction is no longer detected and/or the ignition switch is cycled, the SDM will clear current DTCs and move them to a history file, except for the DTC 051, 053, and sometimes 071. DTC 051 and 053 will not be cleared by the scan tool because these codes require replacement of the SDM. The SDM must be replaced only after the malfunction that set the DTC has been repaired.

SDM Integrity Check

Step Action Yes No
CAUTION: Refer to SDM Voltage After Ignition Is Turned OFF Caution in Cautions and Notices.
CAUTION: Refer to Sensing and Diagnostic Module Handling Caution in Cautions and Notices.
1
  1. Turn the ignition to LOCK and remove the key.
  2. Connect all SIR components and ensure that all the components are properly mounted.
  3. Ensure that the ignition switch has been OFF for at least 30 seconds.
  4. Observe the air bag indicator as the ignition is turned ON.
Does the indicator lamp flashes 7 times?		 Go to Diagnostic System Check - SIR  Go to Step 2 
2
  1. Turn the ignition to LOCK and remove the key.
  2. Connect the scan tool to the data link connector (DLC). Follow the directions given in the scan tool manual.
  3. Turn the ignition to ON.
  4. Request the SIR DTC display with the scan tool.
Is the same DTC displayed that occurred when the SIR Diagnostic System Check was previously performed?		 Go to Step 3  Go to Diagnostic Trouble Code (DTC) List 
3
  1. Clear the SIR DTCs.
  2. Turn the ignition OFF for at least 30 seconds.
  3. Observe the air bag indicator as the ignition is turned ON.
Does the indicator lamp flashes 7 times?		 System OK Go to Step 4 
4
  1. Turn the ignition to LOCK and remove the key.
  2. Disconnect the sensing and diagnostic module (SDM) connector.
  3. Replace the SDM.
  4. Connect the SDM connector and ensure that all components are properly mounted.
Is the repair complete?		 Go to Diagnostic System Check - SIR  -
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