B0080

DTC B0077, B0078, B0079, B0080, B0081, or B0082






Circuit Description

The inflatable restraint side impact sensor (SIS) utilizes a unidirectional 2-wire circuit. The SIS 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 SIS. When the ignition is turned on and input power from the SDM is first detected, the SIS 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 SIS continually communicates status messages to the SDM, which determines if a fault is present in the SIS circuit. When a fault is detected, the SDM resets the SIS twice by removing and reapplying power to it. If the fault is still present, the SDM will set a DTC.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* DTC B0077 Driver Side Impact Sensor (SIS) Performance
* DTC B0078 Passenger Side Impact Sensor (SIS) Performance
* DTC B0079 Incorrect Driver Side Impact Sensor (SIS) Installed
* DTC B0080 Discard Driver Side Impact Sensor (SIS)
* DTC B0081 Incorrect Passenger Side Impact Sensor (SIS) Installed
* DTC B0082 Discard Passenger Side Impact Sensor (SIS)

Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

Conditions for Setting the DTC

* DTC B0077 for the SIS - LF or B0078 for the SIS - RF will set when one of the following conditions occur:

- A valid ID message is not received within 5 seconds of the SIS being powered up.
- Status message is not received.
- The SDM has reset the SIS twice without detecting a valid ID message.

* DTC B0079 for the SIS - LF or B0081 for the SIS - RF will set when one of the following conditions occur:

- The SDM has received an ID message from the SIS which does not match the ID stored in the SDM memory.
- The SDM has reset the SIS twice without detecting a correct ID message.

* DTC B0080 for the SIS - LF or B0082 for the SIS - RF will set when the SDM has received a NOK message from the SIS.

Action Taken When the DTC Sets

The SDM commands ON the AIR BAG warning lamp via class 2 serial data.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
* A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

Diagnostic Aids

The following are conditions that may cause the malfunction:

* A short to ground or voltage in the SIS circuit
* High or low resistance in the SIS circuit
* Improper SIS installed on vehicle

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis, causing a part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for intermittent conditions and poor connections in Diagnostic Aids. Component Tests and General Diagnostics

Test Description

Step 1 - Step 10:

Step 11 - Step 13:

The numbers below refer to the step numbers on the diagnostic table.
7. This step tests the SIS signal and SIS voltage circuits for an open or high resistance.
8. This step tests between the SIS signal and SIS voltage circuits for continuity.
9. This step tests the SIS signal and SIS voltage circuits for a short to voltage.