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B0085




DTC B0083-B0088

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 39
- Left Front Impact Sensor Internal Electronic Failure

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

DTC B0083 71
- Left Front Impact Sensor Invalid Serial Data Received

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 39
- Right Front Impact Sensor Internal Electronic Failure

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

DTC B0084 71
- Right Front Impact Sensor Invalid Serial Data Received

DTC B0085 01
- Left Front Side Impact Sensor Short to Battery

DTC B0085 02
- Left Front Side Impact Sensor Short to Ground

DTC B0085 04
- Left Front Side Impact Sensor Open

DTC B0085 39
- Left Front Side Impact Sensor Internal Malfunction

DTC B0085 3A
- Left Front Side Impact Sensor Incorrect Component Installed

DTC B0085 71
- Left Front Side Impact Sensor Invalid Serial Data Received

DTC B0086 01
- Right Front Side Impact Sensor Short to Battery

DTC B0086 02
- Right Front Side Impact Sensor Short to Ground

DTC B0086 04
- Right Front Side Impact Sensor Open

DTC B0086 39
- Right Front Side Impact Sensor Internal Malfunction

DTC B0086 3A
- Right Front Side Impact Sensor Incorrect Component Installed

DTC B0086 71
- Right Front Side Impact Sensor Invalid Serial Data Received

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, B0085 01, B0086 01

The sensor has been shorted to voltage.

B0083 02, B0084 02, B0085 02, B0086 02

* The sensor has been shorted to ground.

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

B0083 04, B0084 04, B0084 05, B0085 04, B0086 04

* 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, B0085 39, B0086 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, B0085 3A, B0086 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, B0085 71, B0086 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 A/C Compressor Clutch

Description and Operation

SIR System Description and Operation SIR System

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 Control Module References 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.

- Impact sensor

- Inflatable restraint sensing and diagnostic module

- 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-B0088 symptom byte 3A, 39, or 71 is not set as current.

• If DTC B0083-B0088 symptom byte 3A, 39 or 71 is set as current
Replace the appropriate B59 or B63 impact sensor.

• If DTC B0083-B0088 symptom byte 3A, 39 or 71 is not set as current

2. Verify that DTC B0083-B0088 symptom byte 01, 02, or 04 is not set as current.

• 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

3. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate B59 or B63 impact sensor.

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

• If 10 ? or greater

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

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

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

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

• If less than 10 ?

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

• If 50k ? or less

1. Disconnect the 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 ?

4. Ignition ON.

5. 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

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

• If 50k ? or less

1. Disconnect the appropriate 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 ?

7. Disconnect the appropriate harness connector at the K36 inflatable restraint sensing and diagnostic module.

8. Test for less than 2 ? between each harness connector terminal listed below end to end:

* B59L Front impact sensor - left - terminal 1 and K36 inflatable restraint sensing and diagnostic module 20 X1

* B59R Front impact sensor - right - terminal 1 and K36 inflatable restraint sensing and diagnostic module 23 X2

* B63LF Side impact sensor - left front - terminal 1 and K36 inflatable restraint sensing and diagnostic module 26 X2

* B63RF Side impact sensor - right front - terminal 1 and K36 inflatable restraint sensing and diagnostic module 27 X2

• If 2 ? or greater
Repair the open/high resistance in the circuit.

• If less than 2 ?

9. Connect all harness connectors, Ignition ON. Clear all the DTCs.

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

• If the DTC is set
Replace the appropriate B59 or B63 impact sensor.

• If the DTC is not set

11. All OK.

Repair Instructions

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

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

* Inflatable Restraint Side Impact Sensor Replacement (Impala) Inflatable Restraint Side Impact Sensor Replacement (Impala)

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

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