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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 fuse No. 1 to DERM at CRANK input. DERM responds by grounding SIR INDICATOR LOW output 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 7-9 times.

NOTE: Test numbers refer to numbers on diagnostic chart. For circuit number identification, see WIRING DIAGRAMS.
WARNING: To avoid air bag deployment while trouble shooting 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 should flash 7-9 times as ignition is turned on.
  2. As engine is cranked, INFLATABLE RESTRAINT indicator should remain on. If indicator does not respond, go to CHART E.
  3. Improper operation of INFLATABLE RESTRAINT indicator light is indicated. This test differentiates a warning light stays on condition from a warning light does not come on condition.
  4. INFLATABLE RESTRAINT indicator has completed bulb check and goes out, indicating no current codes exist.
  5. Determines whether a current code exists or a false diagnostic request condition is present.
  6. INFLATABLE RESTRAINT indicator has completed a bulb check and indicates current codes exist.
  7. Record all codes on repair order.
  8. If no codes are present, further diagnosis is not necessary.
  9. If scan tester indicates no SIR data is being received from DERM, data link requires diagnosis.
  10. History or current codes are displayed. Ensure codes are diagnosed in order.
Fig 1: SIR Diagnostic System Check
G92H24312Courtesy of GENERAL MOTORS CORP.
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