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| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Centre Front Impact Sensor High Signal | B0083 02 | B0083 04 | B0083 01 | B0083 3A |
Centre Front Impact Sensor Low Reference | B0083 02 | B0083 04 | B0083 01 | B0083 3A |
Left Front Side Impact Sensor High Signal | B0085 02 | B0085 04 | B0085 01 | B0085 39 |
Left Front Side Impact Low Reference | B0085 02 | B0085 04 | B0085 01 | B0085 39 |
Right Front Side Impact Sensor High Signal | B0086 02 | B0086 04 | B0086 01 | B0086 39 |
Right Front Side Impact Sensor Low Reference | B0086 02 | B0086 04 | B0086 01 | B0086 39 |
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 frontal air bags.
Ignition voltage is between 9-16 V.
Any of the following conditions exist for 10 seconds:
The sensor has been shorted to voltage.
| • | The sensor has been shorted to ground. |
| • | The sensor current is greater than 23 mA for greater than 5 milliseconds. |
| • | The sensor circuit is open. |
| • | The SDM has not received a message from the sensor for greater than 375 milliseconds. |
| • | The SDM has received a Not OK message from the sensor. |
| • | The SDM has not received a message. |
| • | The SDM has received identification message from the sensor, which does not match the identification stored in the SDM memory. |
| • | The SDM has reset the sensor twice without detecting the correct identification message. |
The SDM has received invalid serial data from the sensor.
The SDM requests the instrument panel cluster to illuminate the SIR system AIR BAG indicator.
| • | The condition for setting the DTC no longer exists. |
| • | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
| • | An ignition cycle is required for the DTC to go from current to history. |
SIR System Description and Operation
Control Module References for scan tool information
Note: Refer to SIR Service Precautions .
Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.| • | Impact Sensors |
| • | SDM |
| • | Impact sensor wiring harness connector |
| • | SDM wiring harness connector |
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.
If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the high resistance condition due to terminal fretting corrosion.If DTC B0083-B0088 symptom byte 39 or 71 is set as current
| ⇒ | Replace the appropriate B59 or B63 impact sensor. |
If DTC B0083-B0088 symptom byte 39 or 71 is not set as current
If the SDM calibrations do not match the VIN data
| ⇒ | Program the SDM. |
If the SDM calibrations match the VIN data
If the SDM part numbers do not match
| ⇒ | Replace the incorrect B59 or B63 impact sensor |
If the SDM part numbers do match
If DTC B0083-B0088 symptom byte 01, 02 or 04 is set as current
| ⇒ | Refer to Circuit/System Testing. |
If DTC B0083-B0088 symptom byte 01, 02 or 04 is not set as current
If 10 Ω or greater
| 3.1. | Ignition OFF, disconnect the harness connector at the K36 SDM. |
| 3.2. | Test for less than 2 Ω in the low reference circuit end to end. |
If 2 Ω or greater, repair the open/high resistance in the circuit.
If less than 2 Ω, replace the K36 SDM.
If less than 10 Ω
If 50k Ω or less
| 4.1. | Disconnect the harness connector at the K36 SDM. |
| 4.2. | Test for infinite resistance between the signal circuit and ground. |
If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the K36 SDM.
If greater than 50k Ω
| • | Left front side impact sensor terminal 19 X2 |
| • | Centre front impact sensor terminal 23 X2 |
| • | Right front side impact sensor terminal 22 X2 |
If 2 Ω or greater
If less than 2 Ω
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM replacement, setup, and programming |
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