Circuit Description
When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform a turn-on test to diagnose critical malfunctions within the SDM itself.
In case of the belt pretensioner explosion without front air bag inflation due to insufficient impact, replace the exploded belt pretensioner and remove the defect code using the scan tool. If the belt pretensioner explosion counts over 5, the SDM should also be replaced.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1657 Deployment Commanded Pretensioner
Conditions for Running the DTC
Ignition voltage is within the normal operating voltage range.
Conditions for Setting the DTC
The history of the belt pretensioner explosion is in the SDM.
Action Taken When the DTC Sets
The SDM commands the AIR BAG indicator ON.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Warning: Refer to Sensing and Diagnostic Module Voltage after Ignition is Turned Off Warning in the Preface section.
Warning: Refer to Sensing and Diagnostic Module Handling Warning in the Preface section.
