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B0083




DTC B0083 or B0084

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B0083 01
- Left Front Impact Sensor Short to Battery

DTC B0083 02
- Left Front Impact Sensor Short to Ground

DTC B0083 04
- Left Front Impact Sensor Open

DTC B0083 05
- Left Front Impact Sensor High Voltage/Open

DTC B0083 39
- Left Front Impact Sensor Internal Malfunction

DTC B0083 3A
- Left Front Impact Sensor Incorrect Component Installed

DTC B0083 71
- Left Front Impact Sensor Invalid Data

DTC B0084 01
- Right Front Impact Sensor Short to Battery

DTC B0084 02
- Right Front Impact Sensor Short to Ground

DTC B0084 04
- Right Front Impact Sensor Open

DTC B0084 05
- Right Front Impact Sensor High Voltage/Open

DTC B0084 39
- Right Front Impact Sensor Internal Malfunction

DTC B0084 3A
- Right Front Impact Sensor Incorrect Component Installed

DTC B0084 71
- Right Front Impact Sensor Invalid Data

Diagnostic Fault Information






Circuit/System Description

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. The impact sensors can assist in determining the severity of some frontal and side collisions. The inflatable restraint sensing and diagnostic module uses the input from the impact sensors to assist in determining the severity of a collision further supporting air bag deployment. If the inflatable restraint sensing and diagnostic module determines a deployment is warranted, the inflatable restraint sensing and diagnostic module will cause current to flow through the deployment loops deploying the air bags.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

Any of the following conditions exist for 10 seconds:

B0083 01, B0084 01

The sensor has been shorted to voltage.

B0083 02, B0084 02

* The sensor has been shorted to ground.

* The sensor current is greater than 23 mA for greater than 5 milliseconds.

B0083 04, B0083 05, B0084 04, B0084 05

* The sensor circuit is open.

* The inflatable restraint sensing and diagnostic module has not received a message from the sensor for greater than 375 milliseconds.

B0083 39, B0084 39

* The inflatable restraint sensing and diagnostic module has received a Not OK message from the sensor.

* The inflatable restraint sensing and diagnostic module has not received a message.

B0083 3A, B0084 3A

* The inflatable restraint sensing and diagnostic module has received identification message from the sensor, which does not match the identification stored in the inflatable restraint sensing and diagnostic module memory.

* The inflatable restraint sensing and diagnostic module has reset the impact sensor twice without detecting the correct identification message.

B0083 71, B0084 71

The inflatable restraint sensing and diagnostic module has received invalid serial data from the sensor.

Action Taken When the DTC Sets

The inflatable restraint sensing and diagnostic module requests the instrument panel cluster to illuminate the AIR BAG indicator.

Conditions for Clearing the DTC

* 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.

Reference Information

Schematic Reference

SIR Schematics [1][2]Air Bag Systems

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

SIR System Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Connector Repairs Connector Repairs

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Verification

Note:

* Refer to SIR Service Precautions Technician Safety Information.

* 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

- Inflatable restraint sensing and diagnostic module

- Front impact sensor wiring harness connector

- Side impact sensor wiring harness connector

- Inflatable restraint sensing and diagnostic module wiring harness connector

* The connector and connector position assurance (CPA) may seat independent 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 dielectric grease / lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087). This procedure will correct the high resistance condition due to terminal fretting corrosion.

1. Verify that DTC B0083 or B0084 symptom byte 39 or 71 is not set as current.

• If DTC B0083 or B0084 symptom byte 39 or 71 is set as current
Replace the appropriate B59 impact sensor.

• If DTC B0083 or B0084 symptom byte 39 or 71 is not set as current

2. Verify that the inflatable restraint sensing and diagnostic module calibrations match the VIN, software part number, and calibration part number.

• If the inflatable restraint sensing and diagnostic module calibrations do not match the VIN data
Program the inflatable restraint sensing and diagnostic module.

• If the inflatable restraint sensing and diagnostic module calibrations match the VIN data

3. Verify the B59 front impact sensors have the correct part numbers, matching the label part numbers with the parts catalog.

• If the inflatable restraint sensing and diagnostic module part numbers do not match
Replace the incorrect B59 front impact sensor

• If the inflatable restraint sensing and diagnostic module part numbers do match

4. Verify that DTC B0083 or B0084 symptom byte 01, 02, 04, or 05 is not set as current.

• If DTC B0083 or B0084 symptom byte 01, 02, 04, or 05 is set as current
Refer to Circuit/System Testing.

• If DTC B0083 or B0084 symptom byte 01, 02, 04, 05 is not set as current

5. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate B59 front impact sensor. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the X2 harness connector at the K36 inflatable restraint sensing and diagnostic module.

2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K36 inflatable restraint sensing and diagnostic module.

• If less than 10 ohms

3. Ignition ON.

4. Test for less than 11 V between the signal circuit terminal 1 and ground.

• If 11 V or greater

1. Ignition OFF. Disconnect the X2 harness connector at the K36 inflatable restraint sensing and diagnostic module. Ignition ON.

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 inflatable restraint sensing and diagnostic module.

• If less than 11 V

5. Ignition OFF. Test for greater than 50k ohms between the signal circuit terminal 1 and ground.

• If 50k ohms or less

1. Disconnect the X2 harness connector at the K36 inflatable restraint sensing and diagnostic module.

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 inflatable restraint sensing and diagnostic module.

• If greater than 50k ohms

6. Disconnect the X2 harness connector at the inflatable restraint sensing and diagnostic module.

7. Test for less than 2 ohms between the signal circuit end to end from the B59 front impact sensor terminal 1 and the K36 inflatable restraint sensing and diagnostic module terminal listed below:

* Right front impact sensor terminal 26 X2

* Left front impact sensor terminal 23 X2

• If 2 ohms or greater

8. Repair the short to voltage or an open/high resistance in the circuit.

• If less than 2 ohms

9. Ignition OFF, reconnect all harness connectors, press in the CPA (if equipped) until an audible and/or tactile click is heard.

10. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.

11. Operate the vehicle under the conditions for setting the DTC. The DTC should not set.

• If the DTC sets
Replace the K36 inflatable restraint sensing and diagnostic module.

• If the DTC does not set

12. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Front End Inflatable Restraint Discriminating Sensor Replacement Front End Inflatable Restraint Discriminating Sensor Replacement

* Control Module References Programming and Relearning for inflatable restraint sensing and diagnostic module replacement, programming and setup

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