DTC 55 Internal SDM Failure. Cadillac Catera 1999

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 1999 🢒 Catera 🢒 Restraints 🢒 SIR 🢒 DTC 55 Internal SDM Failure

Circuit Description

DTC 55 is an indication of a potential internal SDM malfunction and requires SDM replacement.

Conditions for Setting the DTC

An internal malfunction is detected by the SDM.

Action Taken When the DTC Sets

•	The SDM turns ON the AIR BAG warning lamp.

•	The SDM sets a DTC 55.

Conditions for Clearing the DTC

Current and History DTC codes must be cleared using a scan tool Clear DTC Information command. If the circuit fault has been successfully repaired and the conditions which caused the DTC to set are no longer existing, the DTC may be cleared using the scan tool. The SDM must be replaced for a Current DTC 55.

Test Description

Then numbers below refer to step numbers on the diagnostic table.

This test checks for a Current DTC 55.

This test checks for a History DTC 55.

DTC 55 Internal SDM Failure

Step	Action	Value(s)	Yes	No
1	Was the SIR Diagnostic System Check performed?	--	Go to Step 2	Go to SIR Diagnostic System Check
2	Turn the ignition switch to the OFF position. Install the scan tool. Turn the ignition switch to the ON position. use the scan tool to request the SIR DTC display. Is current DTC 55 set?	--	Go to Step 3	Go to Step 4
3	Turn the ignition switch to the OFF position. Replace the inflatable restraint sensing and diagnostic module and seat belt pretensioner (SDM). Refer to Inflatable Restraint Sensing and Diagnostic and Seat Belt Pretensioner Module Replacement . Is the repair complete?	--	Go to SIR Diagnostic System Check	--
4	Is History DTC 55 set?	--	Go to Step 5	Go to Sensing and Diagnostic Module Integrity Check
5	Use the scan tool to clear the DTC information Has the DTC information been cleared?	--	Go to SIR Diagnostic System Check	Go to Sensing and Diagnostic Module Integrity Check