B1657

DTC B1657

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, the SDM maintains warning lamp On and then the system should be inspected and the SDM and pretensioners 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.