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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 |
|---|---|---|---|---|
Left Side Impact Sensor High Signal | B0085 02 | B0085 04, B0085 05 | B0085 01 | B0085 39 |
Left Side Impact Sensor Low Reference | B0085 02 | B0085 04, B0085 05 | B0085 01 | B0085 39 |
Right Side Impact Sensor High Signal | B0086 02 | B0086 04, B0086 05 | B0086 01 | B0086 39 |
Right Side Impact Sensor Low Reference | B0086 02 | B0086 04, B0086 05 | 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 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 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 impact 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 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.| • | Front impact sensor |
| • | Side impact sensor |
| • | SDM |
| • | Front impact sensor wiring harness connector |
| • | Side 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 B0085 or B0086 symptom byte 39 or 71 is set as current
Replace the appropriate B63 side impact sensor.
If DTC B0085 or B0086 symptom byte 39 or 71 is not set as current
If DTC B0085 or B0086 symptom byte 3A is set as current
Replace the incorrect B63 side impact sensor
If DTC B0085 or B0086 symptom byte 3A is not set as current
If DTC B0085 or B0086 symptom byte 01, 02, 04, 05, or OC is set as current
Refer to Circuit/System Testing.
If DTC B0085 or B0086 symptom byte 01, 02, 04, 05 is not set as current
If 10 Ω or greater
| 2.1. | Ignition OFF, disconnect the X2 harness connector at the K36 SDM. |
| 2.2. | 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 11 V or greater
| 4.1. | Ignition OFF. Disconnect the X2 harness connector at the K36 SDM. Ignition ON. |
| 4.2. | Test for less than 1 V between the signal circuit terminal 1 and ground. |
If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V, replace the K36 SDM.
If less than 11 V
If 50k Ω or less
| 6.1. | Disconnect the X2 harness connector at the K36 SDM. |
| 6.2. | 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
| • | B63LF Side impact sensor-left terminal 19 X2 |
| • | B63RF Side impact sensor-right terminal 22 X2 |
If 2 Ω or greater
Repair the open/high resistance in the circuit.
If less than 2 Ω
If the K36 SDM calibrations do not match the VIN data
Program the K36 SDM, refer to Inflatable Restraint Sensing and Diagnostic Module Programming and Setup .
If the K36 SDM calibrations match the VIN data
If the DTC sets
Replace the K36 SDM.
If the DTC does not set
If the SDM calibrations do not match the VIN data
Program the K36 SDM.
If the SDM calibrations match the VIN data
Perform the Diagnostic Repair Verification after completing the repair.
| • | Control Module References for SDM replacement, programming and setup |
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