Operation CHARM: Car repair manuals for everyone.
Home >> Chevrolet >> 2010 >> Tahoe 4WD V8-5.3L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B0086

B0086




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 00
- Electronic Front End Sensor 1 No Additional Information (Left)

DTC B0083 0F
- Electronic Front End Sensor 1 Erratic (Left)

DTC B0083 39
- Electronic Front End Sensor 1 Internal Electronic Failure (Left)

DTC B0083 3A
- Electronic Front End Sensor 1 Incorrect Component Installed (Left)

DTC B0083 71
- Electronic Front End Sensor 1 Invalid Serial Data Received (Left)

DTC B0084 00
- Electronic Front End Sensor 2 No Additional Information (Right)

DTC B0084 0F
- Electronic Front End Sensor 2 Erratic (Right)

DTC B0084 39
- Electronic Front End Sensor 2 Internal Electronic Failure (Right)

DTC B0084 3A
- Electronic Front End Sensor 2 Incorrect Component Installed (Right)

DTC B0084 71
- Electronic Front End Sensor 2 Invalid Serial Data Received (Right)

DTC B0085 00
- LF Side Impact Sensor No Additional Information

DTC B0085 0F
- LF Side Impact Sensor Erratic

DTC B0085 39
- LF Side Impact Sensor Internal Electronic Failure

DTC B0085 3A
- LF Side Impact Sensor Incorrect Component Installed

DTC B0085 71
- LF Side Impact Sensor Invalid Serial Data Received

DTC B0086 00
- RF Side Impact Sensor No Additional Information

DTC B0086 0F
- RF Side Impact Sensor Erratic

DTC B0086 39
- RF Side Impact Sensor Internal Electronic Failure

DTC B0086 3A
- RF Side Impact Sensor Incorrect Component Installed

DTC B0086 71
- RF Side Impact Sensor Invalid Serial Data Received

DTC B0087 00
- LR Side Impact Sensor No Additional Information

DTC B0087 0F
- LR Side Impact Sensor Erratic

DTC B0087 39
- LR Side Impact Sensor Internal Electronic Failure

DTC B0087 3A
- LR Side Impact Sensor Incorrect Component Installed

DTC B0087 71
- LR Side Impact Sensor Invalid Serial Data Received

DTC B0088 00
- RR Side Impact Sensor No Additional Information

DTC B0088 0F
- RR Side Impact Sensor Erratic

DTC B0088 39
- RR Side Impact Sensor Internal Electronic Failure

DTC B0088 3A
- RR Side Impact Sensor Incorrect Component Installed

DTC B0088 71
- RR Side Impact Sensor Invalid Serial Data Received

Diagnostic Fault Information





Circuit/System Description

The inflatable restraint front end sensor utilizes a unidirectional 2-wire circuit. The front end sensor modulates current on the interface to send ID, state of health, and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and a ground for the front end sensor. When the ignition is turned ON and input power from the SDM is first detected, the front end sensor responds by performing internal diagnostics and sending an ID to the SDM. The SDM considers the ID to be valid if the response time is less than 5 seconds. The front end sensor continually communicates status messages to the SDM, which determines if a fault is present in the front end sensor circuit. When a fault is detected, the SDM may reset the front end sensor up to 2 times by removing and reapplying power to it. If the fault is still present, the SDM will set a DTC.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

Any of the following conditions exist for 2.5 seconds:

B0083 00, B0084 00, B0085 00, B0086 00, B0087 00, B0088 00
* The front end sensor has been shorted to voltage, open, or shorted to ground.
* The front end sensor current has been above 23 mA for longer than 5 milliseconds.
* The SDM has not received a message from the front end sensor for more than 375 milliseconds.

B0083 0F, B0084 0F, B0085 0F, B0086 0F, B0087 0F, B0088 0F

The SDM has received erratic messages from the front end sensor.

B0083 39, B0084 39, B0085 39, B0086 39, B0087 39, B0088 39
* The SDM has received a Not Ok (NOK) message from the front end sensor.
* The SDM has not received a message.
* The SDM has received invalid serial data from the front end sensor.

B0083 3A, B0084 3A, B0085 3A, B0086 3A, B0087 3A, B0088 3A
* The SDM has received an ID message from the front end sensor, which does not match the ID stored in the SDM memory.
* The SDM has reset the front end sensor twice without detecting the correct ID message.

B0083 71, B0084 71, B0085 71, B0086 71, B0087 71, B0088 71

The SDM has received invalid serial data from the front end sensor.

Action Taken When the DTC Sets

* The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.
* The SIR System is disabled and no deployments are allowed.

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.

Reference Information
Schematic Reference

SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference

Component Connector End Views (Connector Views)
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 Testing

Important: Refer to SIR Service Precautions (Technician Safety Information).


When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:


* Front end sensor

* SDM module

* Front end sensor wiring harness connector

* SDM wiring harness connector


1. Ignition OFF, disconnect the harness connector at the appropriate sensor.
2. Disconnect the harness connector at the SDM.
3. Ignition ON, test for less than 1 volt between the following signal circuit and ground.

* Right front end sensor terminal 1
* Left front end sensor terminal 1
* Right front side impact sensor terminal B
* Left front side impact sensor terminal B
* Right rear side impact sensor terminal B
* Left rear side impact sensor terminal B

• If greater than the specified range, test the circuit for a short to voltage.

4. Ignition ON, test for less than 1 volt between the low reference circuit and ground.

* Right front end sensor terminal 2
* Left front end sensor terminal 2
* Right front side impact sensor terminal A
* Left front side impact sensor terminal A
* Right rear side impact sensor terminal A
* Left rear side impact sensor terminal A

• If greater than the specified range, test the circuit for a short to voltage.

5. Test for infinite resistance between the signal circuit and ground.

* Right front end sensor terminal 1
* Left front end sensor terminal 1
* Right front side impact sensor terminal B
* Left front side impact sensor terminal B
* Right rear side impact sensor terminal B
* Left rear side impact sensor terminal B

• If less than the specified value, test the circuit for a short to ground.

6. Test for less than 1 ohm between the following signal circuit terminals.

* Right front end sensor terminal 1 and SDM terminal 37.
* Left front end sensor terminal 1 and SDM terminal 36.
* Right front side impact sensor terminal B and the SDM terminal 43.
* Left front side impact sensor terminal B and the SDM terminal 42.
* Right rear side impact sensor terminal B and the SDM terminal 45.
* Left rear side impact sensor terminal B and the SDM terminal 44.

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

7. Test for less then 1 ohm between the following front end sensor low reference circuit terminals.

* Right front end sensor terminal 2 and SDM terminal 39.
* Left front end sensor terminal 2 and SDM terminal 38.
* Right front side impact sensor terminal A and the SDM terminal 41.
* Left front side impact sensor terminal A and the SDM terminal 40.
* Right rear side impact sensor terminal A and the SDM terminal 47.
* Left rear side impact sensor terminal A and the SDM terminal 46.

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

8. If all circuits test normal, replace the appropriate sensor.
9. Reconnect all SIR components. Ignition ON, with a scan tool clear and check for DTCs.

• If the DTC returns and is current, replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Inflatable Restraint Front End Sensor Replacement (Inflatable Restraint Front End Sensor Replacement)
* Inflatable Restraint Side Impact Sensor Replacement (Front Side Door) (Inflatable Restraint Side Impact Sensor Replacement (Front Side Door))Inflatable Restraint Side Impact Sensor Replacement (Rear Side Door) (Inflatable Restraint Side Impact Sensor Replacement (Rear Side Door))
* SIR/SRS Wiring Repairs (SIR/SRS Wiring Repairs)
* Control Module References (Programming and Relearning) for SDM replacement, setup, and programming

pro multis · About Operation CHARM