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 (Driver)DTC B0083 02: Front End Sensor 1 Short to Ground (Driver)
DTC B0083 04: Front End Sensor 2 Open Circuit (Driver)
DTC B0083 39: Front End Sensor 1 Internal Electronic Failure (Driver)
DTC B0083 3A: Front End Sensor 1 Incorrect Component Installed (Driver)
DTC B0083 71: Front End Sensor 1 Invalid Serial Data Received (Driver)
DTC B0084 01: Front End Sensor 2 Short to Battery (Passenger)
DTC B0084 02: Front End Sensor 2 Short to Ground (Passenger)
DTC B0084 04: Front End Sensor 2 Open Circuit (Passenger)
DTC B0084 39: Front End Sensor 2 Internal Electronic Failure (Passenger)
DTC B0084 3A: Front End Sensor 2 Incorrect Component Installed (Passenger)
DTC B0084 71: Front End Sensor 2 Invalid Serial Data Received (Passenger)
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Front End Sensor 1 Signal | B0083 02 | B0083 04 | B0083 04 | B0083 01 | B0083 3A |
Front End Sensor 1 Low Reference | B0083 02 | B0083 04 | B0083 04 | B0083 01 | B0083 3A |
Front End Sensor 2 Signal | B0084 02 | B0084 04 | B0084 04 | B0084 01 | B0084 3A |
Front End Sensor 2 Low Reference | B0084 02 | B0084 04 | B0084 04 | B0084 01 | B0084 3A |
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
All of the following conditions exist for 2 seconds:
B0083 01 or B0084 01
| • | The front end sensor has been shorted to voltage. |
| • | The SDM has not received a message from the front end sensor for more than 5 milliseconds. |
B0083 02 or B0084 02
| • | The front end sensor has been shorted to ground. |
| • | The front end sensor current has been above 23 mA for longer than 5 milliseconds. |
B0083 04 or B0084 04
The front end sensor circuit is open.
B0083 39 or B0084 39
| • | The SDM has received a NOK message from the front end sensor. |
| • | The SDM has not received a message. |
B0083 3A or B0084 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 or B0084 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 is no longer present. |
| • | A history DTC will clear after 250 fault-free ignition cycles. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the X1 and X2 harness connectors at the SDM and the appropriate front end sensor.
- Ignition ON, test for less than 1 volt between the appropriate front end sensor low reference circuit terminal 2 and ground.
- Ignition ON, test for less than 1 volt between the appropriate front end sensor signal circuit terminal 1 and ground.
- Test for infinite resistance between the appropriate front end sensor signal circuit terminal 1 and ground.
- Test for less than 1 ohm between the appropriate front end low reference circuit terminals listed below:
- Test for less than 1 ohm between the appropriate front end sensor signal circuit terminals listed below:
- If all circuits test normal, replace the appropriate front end sensor.
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 |
| • | SDM module |
| • | Front end sensor wiring harness connector |
| • | SDM wiring harness connector |
| ⇒ | If greater than the specified range, test the circuit for a short to voltage. |
| ⇒ | If greater than the specified range, test the circuit for a short to voltage. |
| ⇒ | If less than the specified value, test the circuit for a short to ground. |
| • | Left front end sensor terminal 2 and SDM terminal 19 X1. |
| • | Right front end sensor terminal 2 and SDM terminal 24 X2. |
| ⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
| • | Left front end sensor terminal 1 and SDM terminal 20 X1. |
| • | Right front end sensor terminal 1 and SDM terminal 23 X2. |
| ⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
| ⇒ | If the DTC resets, replace the SDM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for SDM replacement, setup, and programming |
