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Circuit/System Testing

WARNING:

When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Refer to SIR Disabling and Enabling. Failure to observe the correct procedure could cause deployment of the SIR components, personal injury, or unnecessary SIR system repairs.

CAUTION:

Refer to: SIR Disabling and Enabling

CAUTION:

Refer to: SIR Service Precautions

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

NOTE:

The connector position assurance (CPA) should seat with an audible and/or tactile click, for vehicles equipped with shorting bars the CPA isolates the shorting-bars (if equipped) within the connector allowing the deployment circuit to operate properly.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Before attempting these procedures, the SIR system must be disabled.
  3. Disconnect the electrical connector: X1 & X2 @ K36 Inflatable Restraint Sensing and Diagnostic Module & B88P Seat Belt Switch - Passenger
  4. Ignition - On/Vehicle - In Service Mode
  5. Test for less than 0.3 V between the test points: Signal circuit terminal 11 X315 @ Component harness & Ground
    • If greater than 0.3 V 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 0.3 V 
  6. Ignition/Vehicle - Off
  7. Test for infinite resistance between the test points: Signal circuit terminal 11 X315 @ Component harness & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  8. Ignition - On/Vehicle - In Service Mode
  9. Test for less than 0.3 V between the test points: Low Reference circuit terminal 12 X315 @ Component harness & Ground
    • If greater than 0.3 V 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 0.3 V 
  10. Ignition/Vehicle - Off
  11. Test for infinite resistance between the test points: Low Reference circuit terminal 12 X315 @ Component harness & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  12. Before attempting these procedures, the SIR system must be disabled.
  13. Test for less than 2 ohms between the test points: Signal circuit terminal 11 X315 @ B88P Seat Belt Switch - Passenger & Terminal 45 X2 @ K36 Inflatable Restraint Sensing and Diagnostic Module
    • If greater than 2 ohms 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  14. Before attempting these procedures, the SIR system must be disabled.
  15. Test for less than 2 ohms between the test points: Low Reference circuit terminal 12 X315 @ B88P Seat Belt Switch - Passenger & Terminal 44 X2 @ K36 Inflatable Restraint Sensing and Diagnostic Module
    • If greater than 2 ohms 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  16. Test for infinite resistance between the test points: Signal circuit terminal 11 X315 & Low Reference circuit terminal 12 X315 @ Component harness
    • If less than infinite resistance 

      Repair the short between the circuits: Signal circuit terminal 11 X315 & Low Reference circuit terminal 12 X315

    • Go to next step: If infinite resistance 
  17. Replace the component: B88P Seat Belt Switch - Passenger
  18. Verify the DTC does not set.
    • If the DTC is set 

      Replace the component: K36 Inflatable Restraint Sensing and Diagnostic Module

    • Go to next step: If the DTC is not set 
  19. All OK.
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