• | 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. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
Seat Position Sensor Left Low Reference | B0084 | B0084 | B0084 | B0084 | B0084 |
Seat Position Sensor Left Signal | B0084 | B0084 | B0084 | B0084 | B0084 |
Seat Position Sensor Right Low Reference | B0083 | B0083 | B0083 | B0083 | B0083 |
Seat Position Sensor Right Signal | B0083 | B0083 | B0083 | B0083 | B0083 |
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 sensing and diagnostic module (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 2 states of seat position. The shunted state represents a rearward seat position. The non-shunted state represents a forward position. The SPS provides 2 current ranges, one range for the shunted state and a second range for a non-shunted state. These 2 states are inputs to the 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.
Ignition voltage is between 9-16 volts.
• | The SDM detects the SPS circuit amperage is 4 mA or less for 500 milliseconds. |
• | The SDM detects the SPS circuit amperage is between 8-11 mA for 500 milliseconds. |
• | The SDM detects the SPS circuit amperage is 18 mA or greater for 500 milliseconds. |
• | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
• | The SDM defaults the SPS to seat forward threshold. |
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear once 100 malfunction-free ignition cycles have occurred. |
Control Module References for scan tool information
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
• Seat position sensor • SDM module • Seat position 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 range, test the circuit for a short to ground. |
⇒ | If less than the specified value, test the circuit for a short to ground. |
• | Passenger seat position sensor terminal A and SDM harness connector terminal 25. |
• | Driver seat position sensor terminal A and SDM harness connector terminal 24. |
⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
• | Passenger seat position sensor terminal B and SDM harness connector terminal 11. |
• | Driver seat position sensor terminal B and SDM harness connector terminal 11. |
⇒ | If greater than the specified range, test the circuit for an open/high resistance. |
⇒ | If the seat position sensor DTC returns and is current, replace the SDM. |
• | Control Module References for SDM replacement, setup, and programming |
Ignition ON, use the scan tool to clear the DTCs then recheck for DTCs. Verify no DTCs are set.
⇒ | If DTC B0083 or B0084 was current replace the SDM. |