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 diagnostic trouble code (DTC).
DTC B0086 RF Side Impact Sensor
DTC Symptom | DTC Symptom Descriptor |
---|---|
01 | Side Impact Sensor Short To Battery |
02 | Side Impact Sensor Short To Ground |
04 | Side Impact Sensor Open Circuit |
39 | Side Impact Sensor Open Circuit/Internal Electronic Failure |
71 | Side Impact Sensor Invalid Serial Data Received |
0F | Side Impact Sensor Erratic |
3A | Side Impact Sensor Incorrect Component Installed |
Ignition 1 Voltage is within the normal operating voltage range of 9-16 volts.
All of the following conditions exist for 2.5 seconds:
• | The SIS has been shorted to voltage. |
• | The SDM has not received a message from the SIS for more than 375 milliseconds. |
• | The SIS has been shorted to ground. |
• | The SIS current has been above 23 mA for longer than 5 milliseconds. |
The SIS circuit is open
• | The SIS circuit is open |
• | The SDM has received a NOK message from the SIS. |
• | The SDM has not received a message |
The SDM has received invalid serial data from the SIS.
The SDM has received erratic messages from the SIS.
• | 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 the correct ID message. |
The SDM commands ON the AIR BAG warning lamp via GMLAN serial data.
• | The DTC will clear when 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. |
The following are conditions that may cause the malfunction:
• | An open in the SIS circuit |
• | A short to ground or voltage in the SIS circuit |
• | A short between the SIS voltage and signal circuits |
• | High or low resistance in the SIS circuit |
• | Improper SIS installed on vehicle |
• | An internal failure in the SIS |
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 Wiring Systems.
The numbers below refer to the step numbers on the diagnostic table.
This step tests the SIS signal and SIS voltage circuits for an open or high resistance.
This step tests between the SIS signal and SIS voltage circuits for continuity.
This step tests the SIS signal and SIS voltage circuits for a short to voltage.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Important: CANdi module J-45289 must be used with the scan tool. Does the scan tool indicate that DTC B0086 is current? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
3 |
Does the connector exhibit any signs of damage or corrosion? | Go to Step 4 | Go to Step 5 |
4 |
Did you complete the repair? | Go to Step 11 | -- |
5 |
Does the connector exhibit any signs of damage or corrosion? | Go to Step 6 | Go to Step 7 |
6 |
Did you complete the repair? | Go to Step 11 | -- |
Did you find and correct the condition? | Go to Step 11 | Go to Step 8 | |
Test for continuity between the SIS signal circuit and the SIS voltage circuit on the SDM connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 9 | |
Did you find and correct the condition? | Go to Step 11 | Go to Step 10 | |
10 |
Did you complete the replacement? | Go to Step 11 | -- |
11 |
Does the DTC reset? | Go to Step 12 | System OK |
12 |
Did you complete the replacement? | Go to Step 13 | -- |
13 |
Does the DTC reset? | Go to Step 2 | System OK |