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Sir Diagnostic System Check: Description

Diagnostic procedures used in this section are designed to find and repair SIR problems. For best results, utilize diagnostic charts and follow sequence listed below:

  1. Perform SIR DIAGNOSTIC SYSTEM CHECK. SIR DIAGNOSTIC SYSTEM CHECK should be start of any SIR diagnosis. SIR DIAGNOSTIC SYSTEM CHECK checks for proper INFLATABLE RESTRAINT indicator operation and SIR trouble codes.
  2. Refer to diagnostic chart as directed by SIR DIAGNOSTIC SYSTEM CHECK. SIR DIAGNOSTIC SYSTEM CHECK will lead to correct chart to diagnose any SIR problems. By-passing these procedures may result in extended diagnostic time.
  3. Repeat SIR DIAGNOSTIC SYSTEM CHECK after any repair or diagnostic procedures are performed. Repeating SIR DIAGNOSTIC SYSTEM CHECK will ensure repair was made correctly and no other conditions exist.

When ignition is first turned on, system voltage is applied through fuse No. 7 to Diagnostic Energy Reserve Module (DERM) at IGNITION 1 input and through fuse No. 6 to DERM at SIR INDICATOR HIGH input. DERM responds by flashing INFLATABLE RESTRAINT indicator 7-9 times.

When engine is cranked, system voltage is applied from to DERM at CRANK input. DERM responds by grounding light circuit until system voltage is removed from CRANK input. This results in a steady INFLATABLE RESTRAINT indicator during cranking. After engine is cranked, DERM will again flash INFLATABLE RESTRAINT indicator 7 times, with solid on of indicator during crank counting as one.

NOTE: Test numbers refer to test numbers on diagnostic chart. For circuit number identification, see WIRING DIAGRAMS.
WARNING: To avoid air bag deployment while troubleshooting the SIR system, only use test equipment specified in diagnostic charts. Under no circumstances should battery powered test equipment or test light be used. Carefully follow all instructions.
  1. INFLATABLE RESTRAINT indicator operation. Test indicates a short to voltage in SIR INDICATOR wiring.
  2. INFLATABLE RESTRAINT indicator should blink 7 times as ignition is just turned on.
  3. As engine is cranked, INFLATABLE RESTRAINT indicator light should remain on steady. If indicator does not respond, use Chart E to diagnose malfunction.
  4. INFLATABLE RESTRAINT indicator has completed bulb check and goes out, indicating no current codes exist.
  5. Record all codes (both history and current) onto repair order.
  6. Codes are displayed (history or current). Order in which codes are diagnosed is very important.
  7. Incorrect INFLATABLE RESTRAINT indicator operation is indicated. This test identifies an indicator on condition.
  8. Incorrect INFLATABLE RESTRAINT indicator operation is indicated. Test determines if fault is in redundant indicator circuits or if an indicator OFF condition exists.
  9. Checks whether a current code exists or a false diagnostic request condition is present.
  10. INFLATABLE RESTRAINT indicator has completed bulb check and indicates current codes exist.
  11. No codes are present and no further diagnosis is necessary.
  12. Scan tester indicates no SIR data is being received from DERM. SERIAL DATA circuit requires diagnosis.
Fig 1: SIR Diagnostic System Check
G92G24253Courtesy of GENERAL MOTORS CORP.
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