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
DTC B0083 02: Front End Sensor 1 Short to Ground
DTC B0083 04: Front End Sensor 1 Open
DTC B0083 39: Front End Sensor 1 Internal Malfunction
DTC B0083 3A: Front End Sensor 1 Incorrect Component Installed
DTC B0083 71: Front End Sensor 1 Invalid Serial Data Received
DTC B0084 01: Front End Sensor 2 Short to Battery
DTC B0084 02: Front End Sensor 2 Short to Ground
DTC B0084 04: Front End Sensor 2 Open
DTC B0084 39: Front End Sensor 2 Internal Malfunction
DTC B0084 3A: Front End Sensor 2 Incorrect Component Installed
DTC B0084 71: Front End Sensor 2 Invalid Serial Data Received
DTC B0085 01: LF Side Impact Sensor Short to Battery
DTC B0085 02: LF Side Impact Sensor Short to Ground
DTC B0085 04: LF Side Impact Sensor Open
DTC B0085 39: LF Side Impact Sensor Internal Malfunction
DTC B0085 3A: LF Side Impact Sensor Incorrect Component Installed
DTC B0085 71: LF Side Impact Sensor Invalid Serial Data Received
DTC B0086 01: RF Side Impact Sensor Short to Battery
DTC B0086 02: RF Side Impact Sensor Short to Ground
DTC B0086 04: RF Side Impact Sensor Open
DTC B0086 39: RF Side Impact Sensor Internal Malfunction
DTC B0086 3A: RF Side Impact Sensor Incorrect Component Installed
DTC B0086 71: RF Side Impact Sensor Invalid Serial Data Received
DTC B0087 01: LR Side Impact Sensor Short to Battery
DTC B0087 02: LR Side Impact Sensor Short to Ground
DTC B0087 04: LR Side Impact Sensor Open
DTC B0087 39: LR Side Impact Sensor Internal Malfunction
DTC B0087 3A: LR Side Impact Sensor Incorrect Component Installed
DTC B0087 71: LR Side Impact Sensor Invalid Serial Data Received
DTC B0088 01: RR Side Impact Sensor Short to Battery
DTC B0088 02: RR Side Impact Sensor Short to Ground
DTC B0088 04: RR Side Impact Sensor Open
DTC B0088 39: RR Side Impact Sensor Internal Malfunction
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 Signal | B0083 02 | B0083 04 | B0083 04 | B0083 01 | B0083 39
Front End Sensor 1 Low Reference | B0083 02 | B0083 04 | B0083 04 | B0083 01 | B0083 39
Front End Sensor 2 High Signal | B0084 02 | B0084 04 | B0084 04 | B0084 01 | B0084 39
Front End Sensor 2 Low Reference | B0084 02 | B0084 04 | B0084 04 | B0084 01 | B0084 39
Left Front Side Impact Sensor High Signal | B0085 02 | B0085 04 | B0085 04 | B0085 01 | B0085 39
Left Front Side Impact Low Reference | B0085 02 | B0085 04 | B0085 04 | B0085 01 | B0085 39
Right Front Side Impact Sensor High Signal | B0086 02 | B0086 04 | B0086 04 | B0086 01 | B0086 39
Right Front Side Impact Low Reference | B0086 02 | B0086 04 | B0086 04 | B0086 01 | B0086 39
Left Rear Side Impact Sensor High Signal | B0087 02 | B0087 04 | B0087 04 | B0087 01 | B0087 39
Left Rear Side Impact Low Reference | B0087 02 | B0087 04 | B0087 04 | B0087 01 | B0087 39
Right Rear Side Impact Sensor High Signal | B0088 02 | B0088 04 | B0088 04 | B0088 01 | B0088 39
Right Rear Side Impact Low Reference | B0088 02 | B0088 04 | B0088 04 | B0088 01 | B0088 39

### Circuit/System Description

The inflatable restraint front end and side impact sensors utilize a bidirectional 2-wire circuit. The sensors modulate 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 sensors. When the ignition is turned ON and input power from the SDM is first detected, the sensors respond 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 sensors continually communicate status messages to the SDM, which determines if a fault is present in the sensor circuit. When a fault is detected, the SDM may reset the sensors 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 V.

### 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 sensor has been shorted to voltage.

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

• | The sensor has been shorted to ground.

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

#### B0083 04 or B0084 04, B0085 04, B0086 04, B0087 04, B0088 04

• | The sensor circuit is open.

• | The SDM has not received a message from the 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 sensor.

#### B0083 39, B0084 39, B0085 39, B0086 39, B0087 39, B0088 39

• | The SDM has received a Not OK (NOK) message from the 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 sensor, which does not match the ID stored in the SDM memory.

• | The SDM has reset the 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 sensor.

### Action Taken When the DTC Sets

• | The SDM requests the instrument panel cluster 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

Note: 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 or side impact sensor

• | SDM module

• | Front end or side impact sensor wiring harness connector

• | SDM wiring harness connector

1. Ignition OFF, disconnect the harness connector at the K36 SDM and the appropriate sensor.
2. Ignition ON, test for less than 1 V 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 V 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 Ω between the appropriate control circuit terminals listed below:

• | With RPO code AW7 B59L left front end sensor signal circuit terminal 1 and K36 SDM terminal 23 X3

• | Without RPO code AW7 B59L left front end sensor signal circuit terminal 1 and K36 SDM terminal 23 X2

• | With RPO code AW7 B59L left front end sensor low reference circuit terminal 2 and the K36 SDM terminal 20 X3

• | Without RPO code AW7 B59L left front end sensor low reference circuit terminal 2 and the K36 SDM terminal 20 X2

• | With RPO code AW7 B59R right front end sensor signal circuit terminal 1 and the K36 SDM terminal 26 X3

• | Without RPO code AW7 B59R right front end sensor signal circuit terminal 1 and the K36 SDM terminal 26 X2

• | With RPO code AW7 B59R right front end sensor low reference circuit terminal 2 and the K36 SDM terminal 25 X3

• | Without RPO code AW7 B59R right front end sensor low reference circuit terminal 2 and the K36 SDM terminal 25 X2

• | With RPO code AW7 B63LF left front side impact sensor signal circuit terminal 1 and the K36 SDM terminal 19 X3

• | Without RPO code AW7 B63LF left front side impact sensor signal circuit terminal 1 and the K36 SDM terminal 19 X2

• | With RPO code AW7 B63LF left front side impact sensor low reference circuit terminal 2 and the K36 SDM terminal 20 X3

• | Without RPO code AW7 B63LF left front side impact sensor low reference circuit terminal 2 and the K36 SDM terminal 20 X2

• | With RPO code AW7 B63RF right front side impact sensor signal circuit terminal 1 and the K36 SDM terminal 22 X3

• | Without RPO code AW7 B63RF right front side impact sensor signal circuit terminal 1 and the K36 SDM terminal 22 X2

• | With RPO code AW7 B63RF right front side impact sensor low reference circuit terminal 2 and the K36 SDM terminal 21 X3

• | Without RPO code AW7 B63RF right front side impact sensor low reference circuit terminal 2 and the K36 SDM terminal 21 X2

• | B63LR left rear side impact sensor signal circuit terminal 1 and the K36 SDM terminal 27 X3

• | B63LR left rear side impact sensor low reference circuit terminal 2 and the K36 SDM terminal 28 X3

• | B63RR right rear side impact sensor signal circuit terminal 1 and the K36 SDM terminal 30 X3

• | B63RR right rear side impact sensor low reference circuit terminal 2 and the K36 SDM terminal 29 X3

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

7. If all circuits test normal, replace the appropriate sensor. If the DTC resets, replace the K36 SDM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Inflatable Restraint Front End Sensor Replacement - Right Side

• | Inflatable Restraint Front End Sensor Replacement - Left Side

• | Inflatable Restraint Side Impact Sensor Replacement - Front

• | Inflatable Restraint Rear Side Door Impact Sensor Replacement

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