DTC B1071 Internal SDM Failure. Pontiac Montana Ext. 1999

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1999 🢒 Montana Ext. 🢒 Restraints 🢒 SIR 🢒 DTC B1071 Internal SDM Failure

Table 1:

Circuit Description

DTC B1071 is an indication of a potential internal inflatable restraint sensing and diagnostic module (SDM) malfunction. DTC B1071 will set upon detection of any condition in the table below.

Conditions for Setting the DTC

Malfunction	Detection Test
23 VLR voltage out of normal operating range.	Power-On, continuous monitoring
Crash data recording reserve voltage discharge time failure for three consecutive ignition cycles.	Power-On
The calculated checksum for internal memory does not match the stored value.	Power-On
The accelerometer(s) is (are) malfunctioning.	Power-On, continuous monitoring
The driver or passenger current source is malfunctioning.	Resistance measurement
The temporary memory storage area is malfunctioning.	Power-On
The inflatable restraint sensing and diagnostic module (SDM) is unable to read from or write to EEPROM.	Power-On
The arming sensor inside the inflatable restraint sensing and diagnostic module (SDM) is not closed during a deployment event.	Asynchronously
The voltage measured at DRIVER SIDE LOW and PASSENGER SIDE LOW is too low.	Power-On, continuous monitoring
The device inside the inflatable restraint sensing and diagnostic module that arms the system for deployment is malfunctioning.	Power-On, continuous monitoring
The permanent memory storage area is malfunctioning.	Power-On

Action Taken When the DTC Sets

•	The SDM sets a DTC B1071.

•	The SDM turns ON the AIR BAG warning lamp.

Conditions for Clearing the DTC

•	Current DTC The malfunction has not been detected for 500 milliseconds.

•	History DTC

-	You issue a scan tool CLEAR CODES command.

-	Once 250 malfunction free ignition cycles have occurred.

Diagnostic Aids

When you issue a scan tool CLEAR CODES command, some of the indicated malfunctions will only allow the AIR BAG warning lamp to go out briefly then come back ON.

DTC B1071 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	Is DTC B1057 set?	--	Go to DTC B1057 Driver Side Air Bag Deployment Commanded	Go to Step 3
3	Is DTC B1058 set?	--	Go to DTC B1058 Pass. Side Air Bag Deployment Commanded	Go to Step 4
4	Turn the ignition switch OFF. Replace the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the repair complete?	--	Go to SIR Diagnostic System Check	--