For 1990-2009 cars

### Diagnostic Instructions

• | 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.

### DTC Descriptors

DTC B0083 01: Front End Sensor 1 Short to Battery (Left)
DTC B0083 02: Front End Sensor 1 Short to Ground (Left)
DTC B0083 05: Front End Sensor 1 Short to Battery or Open (Left)
DTC B0083 0F: Front End Sensor 1 Erratic (Left)
DTC B0083 39: Front End Sensor 1 Internal Electronic Failure (Left)
DTC B0083 3A: Front End Sensor 1 Incorrect Component Installed (Left)
DTC B0083 71: Front End Sensor 1 Invalid Serial Data Received (Left)
DTC B0084 01: Front End Sensor 2 Short to Battery (Right)
DTC B0084 02: Front End Sensor 2 Short to Ground (Right)
DTC B0084 05: Front End Sensor 2 Short to Battery or Open (Right)
DTC B0084 0F: Front End Sensor 2 Erratic (Right)
DTC B0084 39: Front End Sensor 2 Internal Electronic Failure (Right)
DTC B0084 3A: Front End Sensor 2 Incorrect Component Installed (Right)
DTC B0084 71: Front End Sensor 2 Invalid Serial Data Received (Right)
DTC B0085 02: LF Side Impact Sensor Short to Ground
DTC B0085 05: LF Side Impact Sensor Short to Battery or Open
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 02: RF Side Impact Sensor Short to Ground
DTC B0086 05: RF Side Impact Sensor Short to Battery or Open
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 02: LR Side Impact Sensor Short to Ground
DTC B0087 05: LR Side Impact Sensor Short to Battery or Open
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 02: RR Side Impact Sensor Short to Ground
DTC B0088 05: RR Side Impact Sensor Short to Battery or Open
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 | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance
--- | --- | --- | --- | --- | ---
Front End Sensor 1 High | B0083 02 | B0083 0F | B0083 05 | B0083 01, B0083 05 | B0083 0F
Front End Sensor 1 Low | B0083 02 | B0083 0F | B0083 05 | B0083 01, B0083 05 | B0083 0F
Front End Sensor 2 High | B0084 02 | B0084 0F | B0084 05 | B0084 01, B0084 05 | B0084 0F
Front End Sensor 2 Low | B0084 02 | B0084 0F | B0084 05 | B0084 01, B0084 05 | B0084 0F
Left Front Side Impact Sensor High | B0085 02 | B0085 0F | B0085 05 | B0085 01, B0085 05 | B0085 0F
Left Front Side Impact Low | B0085 02 | B0085 0F | B0085 05 | B0085 01, B0085 05 | B0085 0F
Right Front Side Impact Sensor High | B0086 02 | B0086 0F | B0086 05 | B0086 01, B0086 05 | B0086 0F
Right Front Side Impact Low | B0086 02 | B0086 0F | B0086 05 | B0086 01, B0086 05 | B0086 0F
Left Rear Side Impact Sensor High | B0087 02 | B0087 0F | B0087 05 | B0087 01, B0087 05 | B0087 0F
Left Rear Side Impact Low | B0087 02 | B0087 0F | B0087 05 | B0087 01, B0087 05 | B0087 0F
Right Rear Side Impact Sensor High | B0088 02 | B0088 0F | B0088 05 | B0088 01, B0088 05 | B0088 0F
Right Rear Side Impact Low | B0088 02 | B0088 0F | B0088 05 | B0088 01, B0088 05 | B0088 0F

### Circuit/System Description

The inflatable restraint front end sensor utilizes a bidirectional 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 01, B0084 01, B0085 01, B0086 01, B0087 01, B0088 01

The front end sensor has been shorted to voltage.

#### B0083 02, B0084 02, B0085 02, B0086 02, B0087 02, B0088 02

• | The front end sensor has been shorted to ground.

• | The front end sensor current has been above 23 mA for greater than 5 milliseconds.

#### B0083 05 or B0084 05, B0085 05, B0086 05, B0087 05, B0088 05

• | The front end sensor has been shorted to voltage.

• | The front end sensor circuit is open.

• | The SDM has not received a message from the front end sensor for greater 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.

#### 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 commands the AIR BAG indicator ON.

• | 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

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

SIR System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Testing for Intermittent Conditions and Poor Connections

• | Connector Repairs

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information.

### Circuit/System Testing

Important: Refer to SIR Service Precautions .

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

• | The front end sensor

• | The SDM module

• | The front end sensor wiring harness connector

• | The SDM wiring harness connector

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

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

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

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

4. Test for infinite resistance between the signal circuit terminal B and ground.

⇒ | If less than infinite resistance, test the circuit for a short to ground.

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

• | Right front end sensor terminal B and SDM harness connector terminal 37.

• | Left front end sensor terminal B and SDM harness connector terminal 36.

• | Right front side impact sensor terminal B and the SDM harness connector terminal 43.

• | Left front side impact sensor terminal B and the SDM harness connector terminal 42.

• | Right rear side impact sensor terminal B and the SDM harness connector terminal 45.

• | Left rear side impact sensor terminal B and the SDM harness connector terminal 44.

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

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

• | Right front end sensor terminal A and SDM harness connector terminal 39.

• | Left front end sensor terminal A and SDM harness connector terminal 38.

• | Right front side impact sensor terminal A and the SDM harness connector terminal 41.

• | Left front side impact sensor terminal A and the SDM harness connector terminal 40.

• | Right rear side impact sensor terminal A and the SDM harness connector terminal 47.

• | Left rear side impact sensor terminal A and the SDM harness connector terminal 46.

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

7. If all circuits test normal, replace the appropriate sensor.
8. 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 after completing the diagnostic procedure.

• | Inflatable Restraint Front End Sensor Replacement

• | Inflatable Restraint Side Impact Sensor Replacement - Front

• | Inflatable Restraint Side Impact Sensor Replacement - Rear

• | SIR/SRS Wiring Repairs

• | Control Module References for SDM replacement, setup, and programming