• | 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 Low Reference | -- | B0072 04, B0073 04 | B0072 04 | B0079 01 | B0072 08 |
Seat Belt Switch Left Signal | B0073 02, 06 | B0072 04 | B0072 04 | B0072 01 | B0072 08 |
Seat Belt Switch Right Signal | B0073 02, 06 | B0073 04 | B0073 04 | B0073 01 | B0073 08 |
The inflatable restraint seat belt switch is within the seat belt retractor and provides an input to the inflatable restraint sensing and diagnostic module (SDM). The SDM supplies a low reference circuit and a seat belt switch signal circuit to determine a buckled or unbuckled condition. The SDM monitors the seat belt switch circuits, and if a fault is detected a DTC will be set.
Ignition voltage is between 9-16 volts.
The SDM detects the seat switch signal circuit or low reference circuit is shorted to voltage for 500 milliseconds.
The SDM detects the seat switch signal circuit or low reference circuit is shorted to ground for 500 milliseconds.
The SDM detects the seat switch signal circuit or low reference circuit is open for 500 milliseconds.
The SDM detects the seat switch signal circuit or low reference circuit is shorted to ground or an open for 500 milliseconds.
The SDM detects an invalid signal in the seat switch signal circuit.
• | The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator. |
• | The SDM will store a DTC. |
• | The condition 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:
• The seat belt switch is not serviced separately. The seat belt retractor with the seat belt switch must be serviced as a complete unit. • When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector: - SDM module - Seat belt switch wiring harness connector - Seat belt switch - SDM wiring harness connector
⇒ | If greater than the specified range, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the SDM. |
⇒ | If less that the specified range, test the signal circuit for open/high resistance or a short to ground. If the circuit tests normal, replace the SDM. |
⇒ | If greater that the specified range, test the signal circuit for a short to voltage. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for SDM and PPS replacement, setup, and programming |