Spark

DTC B0083-B0088

The impact sensors are equipped on vehicles to supplement the Supplemental Inflatable Restraint (SIR) System performance. The impact sensors are electronic and are not part of the deployment loops, but instead provide inputs to the inflatable restraint sensing and diagnostic module (SDM). The impact sensors can assist in determining the severity of some frontal and side collisions. The SDM uses the input from the impact sensors to assist in determining the severity of a collision further supporting air bag deployment. If the SDM determines a deployment is warranted, the SDM will cause current to flow through the deployment loops deploying the appropriate air bags. The centre front impact sensor and side impact sensors utilise a bidirectional 2-wire circuit. The sensors modulate current on the interface to send identification, state of health, and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and an ground for the sensors. When the ignition is turned ON and input power from the SDM is first detected, the sensors respond by performing internal diagnostics and sending an identification to the SDM. The SDM considers the identification to be valid if the response time is less than 5 seconds. The sensors continually communicate status messages to the SDM, which determines if a fault is present in the sensor circuit. When a fault is detected, the SDM may reset the sensors up to 2 times by removing and reapplying power to it. If the fault is still present, the SDM will set a DTC.

Ignition voltage is between 9-16 V.

Any of the following conditions exist for 10 seconds:

B0085 01, B0086 01

The impact sensor has been shorted to voltage.

B0085 02, B0086 02

B0085 04, B0086 04

B0085 39, B0086 39

B0085 3A, B0086 3A

B0085 71, B0086 71

The SDM has received invalid serial data from the impact sensor.

The SDM requests the instrument panel cluster to illuminate the AIR BAG indicator.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Note: Refer to SIR Service Precautions .

Note: The connector and connector position assurance (CPA) may seat independently of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. Replace any CPA that is damaged or missing.

1. Verify that DTC B0083-B0086 symptom byte 39 or 71 is not set as current.

⇒	If symptom byte 39 or 71 is set as current, replace the appropriate B63 impact sensor.

2. Verify that the SDM calibrations match the VIN data, software part number, and calibration part number.

⇒	If not the correct data or part number, program the SDM.

3. Verify the correct impact sensors have the correct part numbers, matching the label part numbers with the parts book.

⇒	If the part numbers do not match, replace the incorrect B63 impact sensor

4. Verify that DTC B0083-B0086 symptom byte 01, 02 or 04 is not set as current.

⇒	If symptom byte 01, 02 or 04 is set as current, refer to Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the appropriate B63 impact sensor.
2. Ignition OFF, wait 60 seconds, test for less than 10 Ω between the low reference circuit terminal 2 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K36 SDM.

3. Test for greater than 50k Ω between the signal circuit terminal 1 and ground.

⇒	If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K36 SDM.

4. Disconnect the harness connector at the SDM.
5. Test for less than 1 Ω between the impact sensor signal circuit terminal 1 and the SDM terminal listed below.

•	Left front side impact sensor terminal 19 X2

•	Right front side impact sensor terminal 22 X2

⇒	If greater than the specified range, test the circuit for an open/high resistance.

6. If all circuits test normal, replace the B63 impact sensor. The DTC should not be set as current.

⇒	If the DTC resets as current, replace the K36 SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.