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: Left Or Middle EFS Circuit High Voltage (Electronic Front Impact Sensor)
DTC B0083 02: Left Or Middle EFS Circuit Low Voltage (Electronic Front Impact Sensor)
DTC B0083 39: Replace Left Or Middle EFS (Electronic Front Impact Sensor)
DTC B0083 3A: Incorrect Left Or Middle EFS Installed (Electronic Front Impact Sensor)
DTC B0083 5A: Left Or Middle EFS Not Programmed (Electronic Front Sensor)
DTC B0083 71: Invalid Data From Left Or Middle EFS (Electronic Front Sensor)
DTC B0084 01: Right EFS Circuit High Voltage (Electronic Front Impact Sensor)
DTC B0084 02: Right EFS Circuit Low Voltage (Electronic Front Impact Sensor)
DTC B0084 39: Replace Right EFS (Electronic Front Impact Sensor)
DTC B0084 3A: Incorrect Right EFS Installed (Electronic Front Impact Sensor)
DTC B0084 5A: Right EFS Not Programmed (Electronic Front Sensor)
DTC B0084 71: Invalid Data From Right EFS (Electronic Front Impact Sensor)
DTC B0085 01: Driver SIS Circuit High Voltage (Side Impact Sensor)
DTC B0085 02: Driver SIS Circuit Low Voltage (Side Impact Sensor)
DTC B0085 39: Replace Driver SIS (Side Impact Sensor)
DTC B0085 3A: Incorrect Driver SIS Installed (Side Impact Sensor)
DTC B0085 5A: Driver SIS Not Programmed (Side Impact Sensor)
DTC B0085 71: Invalid Data From Driver SIS (Side Impact Sensor)
DTC B0086 01: Passenger SIS Circuit High Voltage (Side Impact Sensor)
DTC B0086 02: Passenger SIS Circuit Low Voltage (Side Impact Sensor)
DTC B0086 39: Replace Passenger SIS (Side Impact Sensor)
DTC B0086 3A: Incorrect Passenger SIS Installed (Side Impact Sensor)
DTC B0086 5A: Passenger SIS Not Programmed (Side Impact Sensor)
DTC B0086 71: Invalid Data From Passenger SIS (Side Impact Sensor)

### Diagnostic Fault Information

Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance
--- | --- | --- | --- | --- | ---
Front End Sensor - Left High | B0083 02 | B0083 01 | B0083 01 | B0083 01 | --
Front End Sensor - Left Low | B0083 02 | B0083 01 | B0083 01 | B0083 01 | --
Front End Sensor - Right High | B0084 02 | B0084 01 | B0084 01 | B0084 01 | --
Front End Sensor - Right Low | B0084 02 | B0084 01 | B0084 01 | B0084 01 | --
Left Front Side Impact Sensor High | B0085 02 | B0085 01 | B0085 01 | B0085 01 | --
Left Front Side Impact Low | B0085 02 | B0085 01 | B0085 01 | B0085 01 | --
Right Front Side Impact Sensor High | B0086 02 | B0086 01 | B0086 01 | B0086 01 | --
Right Front Side Impact Low | B0086 02 | B0086 01 | B0086 01 | B0086 01 | --

### 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 1 second:

#### B0083 01, B0084 01, B0085 01, or B0086 01

The impact sensor has been shorted to voltage.

#### B0083 02, B0084 02, B0085 02, or B0086 02

• | The impact sensor has been shorted to ground.

• | The impact sensor current has been above 23 mA.

#### B0083 39, B0084 39, B0085 39, or B0086 39

• | The SDM has received a Not OK (NOK) message from the impact sensor.

• | The SDM has not received a message.

#### B0083 3A, B0084 3A, B0085 3A, or B0086 3A

• | The SDM has received an ID message from the impact sensor, which does not match the ID stored in the SDM memory.

• | The SDM has reset the impact sensor twice without detecting the correct ID message.

#### B0083 5A, B0084 5A, B0085 5A, or B0086 5A

• | The SDM has received an ID message from the impact sensor, which does not match the ID stored in the SDM memory.

• | The SDM has reset the impact sensor twice without detecting the correct ID message.

#### B0083 71, B0084 71, B0085 71, or B0086 71

The SDM has received invalid serial data from the impact 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

#### 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:

• | Front end sensor

• | Side impact sensor

• | SDM module

• | Front end sensor wiring harness connector

• | Side impact sensor wiring harness connector

• | SDM wiring harness connector

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

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

5. Test for infinite resistance between the low reference circuit terminal 2 and ground.

⇒ | 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 32 X2.

• | Left front end sensor terminal 1 and SDM terminal 30 X2.

• | Right front side impact sensor terminal 1 and SDM terminal 41 X2.

• | Left front side impact sensor terminal 1 and SDM terminal 39 X2.

⇒ | 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 33 X2.

• | Left front end sensor terminal 2 and SDM terminal 31 X2.

• | Right front side impact sensor terminal 2 and SDM terminal 42 X2.

• | Left front side impact sensor terminal 2 and SDM terminal 40 X2.

⇒ | 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 after completing the diagnostic procedure.

• | Inflatable Restraint Front End Sensor Replacement

• | Inflatable Restraint Front End Sensor Replacement - Right Side

• | Inflatable Restraint Front End Sensor Replacement - Left Side

• | Inflatable Restraint Side Impact Sensor Replacement

• | SIR/SRS Wiring Repairs

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