B0086
DTC B0085 or B0086
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC B0085 01
- Left Front/Driver Side Impact Sensor Short to Battery
DTC B0085 02
- Left Front/Driver Side Impact Sensor Short to Ground
DTC B0085 04
- Left Front/Driver Side Impact Sensor Open Circuit
DTC B0085 39
- Left Front/Driver Side Impact Sensor Internal Electronic Failure
DTC B0085 71
- LF Side Impact Sensor Invalid Serial Data Received
DTC B0085 0F
- Left Front/Driver Side Impact Sensor Incorrect Component Installed
DTC B0085 3A
- Left Front/Driver Side Impact Sensor Invalid Serial Data Received
DTC B0086 01
- Right Front/Passenger Side Impact Sensor Short to Battery
DTC B0086 02
- Right Front/Passenger Side Impact Sensor Short to Ground
DTC B0086 04
- Right Front/Passenger Side Impact Sensor Open Circuit
DTC B0086 39
- Right Front/Passenger Side Impact Sensor Internal Electronic Failure
DTC B0086 71
- RF Side Impact Sensor Invalid Serial Data Received
DTC B0086 0F
- Right Front/Passenger Side Impact Sensor Incorrect Component Installed
DTC B0086 3A
- Right Front/Passenger Side Impact Sensor Invalid Serial Data Received
Diagnostic Fault Information
Circuit/System Description
The inflatable restraint side impact sensor utilizes a unidirectional 2-wire circuit. The side impact 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 side impact sensor. When the ignition is turned ON and input power from the SDM is first detected, the side impact 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 side impact sensor continually communicates status messages to the SDM, which determines if a fault is present in the side impact sensor circuit. When a fault is detected, the SDM may reset the side impact 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 2.5 seconds:
B0085 01 or B0086 01
* The SIS has been shorted to voltage.
* The SDM has not received a message from the SIS for more than 375 milliseconds
B0085 02 or B0086 02
* The side impact sensor has been shorted to ground.
* The side impact sensor current has been above 23 mA for longer than 5 milliseconds.
B0085 04 or B0086 04
The SIS circuit is open
B0085 39 or B0086 39
* The SDM has received a NOK message from the side impact sensor.
* The SDM has not received a message.
B0085 71 or B0086 71
The SDM has received invalid serial data from the side impact sensor.
B0085 0F or B0086 0F
The SDM has received erratic messages from the side impact sensor.
B0085 3A or B0086 3A
* The SDM has received an ID message from the side impact sensor, which does not match the ID stored in the SDM memory.
* The SDM has reset the side impact sensor twice without detecting the correct ID message.
Action Taken When the DTC Sets
* The SDM commands the AIR BAG indicator ON via serial data communications.
* The SIR system is disabled and no deployments are allowed.
Conditions for Clearing the DTC
* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.
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 harness connector at the appropriate side impact sensor.
2. Disconnect the harness connector at the SDM.
3. Ignition ON, test for less than 1-volt between the side impact sensor voltage circuit terminal B and ground.
• 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 side impact sensor signal circuit terminal A and ground.
• If greater than the specified range, test the circuit for a short to voltage.
5. Test for infinite resistance between the side impact sensor voltage circuit terminal B and ground.
• If less than infinite resistance, test the circuit for a short to ground.
6. Test for less than 1 ohm between the following side impact sensor voltage circuit terminals listed below:
* Right side impact sensor terminal B and SDM harness connector terminal 49.
* Left side impact sensor terminal B and SDM harness connector terminal 46.
• If greater than the specified range, test the circuit for an open/voltage resistance.
7. Test for less than 1 ohm between the following side impact sensor signal circuit terminals listed below:
* Right side impact sensor terminal A and SDM harness connector terminal 48
* Left side impact sensor terminal A and SDM harness connector terminal 47.
• If greater than the specified range, test the circuit for an open/high resistance.
8. If all circuits test normal, replace the appropriate side impact sensor.
9. Reconnect all SIR components. Ignition ON, with a scan tool clear and recheck for DTCs.
• If the side impact sensor DTC sets and is current, replace the SDM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Inflatable Restraint Side Impact Sensor Replacement
* SIR/SRS Wiring Repairs