The inflatable restraint seat position sensor (SPS) is used to determine the proximity of a front driver or passenger seat position with respect to the frontal air bag. The SPS interfaces with the SDM. The state of the SPS allows the SDM to disable stage 2 of the frontal air bag for a front seat that is forward of a forward/rearward point in seat track travel. The SPS is a Hall effect sensor that is mounted on the outboard seat track of both the driver and passenger seats. The seat track includes a metal bracket that shunts the SPS magnetic circuit creating two states of seat position. The shunted state represents a rearward seat position. The non-shunted state represents a forward position. The SPS provides two current ranges, one range for the shunted state and a second range for a non-shunted state. These two states are inputs to the sensing and diagnostic module (SDM). State 1 (shunted) being the rearward threshold and state 2 (non-shunted) being the forward threshold. When the SDM receives input from a SPS that state 1 threshold is reached (seat is rearward) the SDM will not disable stage 2 deployment, if required by the deployment sensors. When state 2 threshold is reached (seat is forward) the SDM will disable stage 2 deployment on the side the seat is forward. The SDM monitors the SPS circuit and if a fault is detected the SDM will set codes B0083 or B0084 and defaults to disabling stage 2 frontal deployment. This will only default on the side of the vehicle the sensor has a fault. It's important to understand that the SPS is secondary to the passenger presence system (PPS) and the manual I/P module disable switch. If either one of these devices are in the disable mode the passenger air bag will not deploy regardless of the SPS status.
Ignition 1 voltage is within the normal operating voltage range.
DTC B0083 and B0084 will set when one of the following conditions occur:
• | The SDM detects the SPS circuit amperage is 4 mA or less for 500 milliseconds. |
• | The SDM detects the SPS circuit amperage is between 8 mA and 11 mA for 500 milliseconds. |
• | The SDM detects the SPS circuit amperage is 18 mA or greater for 500 milliseconds. |
• | The SDM commands the AIR BAG indicator ON via Class 2 serial data. |
• | The SDM defaults the SPS to seat forward threshold. |
• | The condition responsible for setting the DTC no longer exists. |
• | You issue a scan tool CLEAR DTCs command. |
• | A history DTC will clear once 255 malfunction free ignition cycles have occurred. |
The following can cause an intermittent condition:
• | A short between the SPS signal and low reference circuits |
• | High or low resistance in the SPS signal and low reference circuits |
• | Inspect the SPS signal and return circuits carefully for cutting and/or chafing |
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
The numbers below refer to the step numbers on the diagnostic table:
Inspects the SPS connector and terminals.
Tests for a short to ground, a high resistance, or an open in the SPS signal circuit.
Tests for a short to ground, a high resistance, or an open in the SPS low reference circuit.
Tests for a short to voltage in the SPS signal and low reference circuits.
Step | Action | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | |||||||||
1 | Did you perform the Diagnostic System Check - SIR? | Go to Step 2 | |||||||
Do the SPS terminals or harness connector exhibit any signs of corrosion, terminal damage, or poor connections? | Go to Step 3 | Go to Step 4 | |||||||
3 |
Did you complete the replacement? | Go to Step 12 | -- | ||||||
4 |
Did you find and correct the condition? | Go to Step 12 | Go to Step 5 | ||||||
5 |
Did you find and correct the condition? | Go to Step 12 | Go to Step 6 | ||||||
Did you find and correct the condition? | Go to Step 12 | Go to Step 7 | |||||||
Did you find and correct the condition? | Go to Step 12 | Go to Step 8 | |||||||
Did you find and correct the condition? | Go to Step 12 | Go to Step 9 | |||||||
9 | For DTC B0083 replace the right SPS. For DTC B0084 replace the left SPS. Refer to Inflatable Restraint Seat Position Sensor Replacement . Did you complete the replacement? | Go to Step 10 | -- | ||||||
10 |
Does the DTC reset? | Go to Step 11 | System OK | ||||||
11 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | Go to Step 12 | -- | ||||||
12 |
Does the DTC reset? | Go to Step 2 | System OK |