B1115

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Wiring Diagram:

CIRCUIT DESCRIPTION
When you first turn ON the ignition, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. Then the SDM proceeds with the resistance measurement test. During one portion of the resistance measurement test, the SDM does the following:
^ Grounds the passenger frontal low terminal through an internal current sink.
^ Connects the passenger frontal high terminal to an internal constant current source. This current produces proportional voltage drops in the deployment loop.
^ Measures the voltage difference between passenger frontal high and low circuits.
^ Calculates the resistance of the passenger frontal deployment loop using the measured voltage.

CONDITIONS FOR RUNNING THE DTC
^ Ignition 1 voltage is within the normal operating voltage range.
^ Passenger frontal deployment loop is not open.
^ Passenger frontal deployment loop is not shorted to voltage.
^ Passenger frontal deployment loop is not shorted to ground.

CONDITIONS FOR SETTING THE DTC
Passenger frontal deployment loop resistance is greater than 3.0 ohms for 500 milliseconds.

ACTION TAKEN WHEN THE DTC SETS
The SDM commands ON the AIR BAG warning lamp via Class 2 serial data.

CONDITIONS FOR CLEARING THE DTC
^ The resistance of the passenger frontal deployment loop is less than or equal to 3.0 ohms for 500 milliseconds.
^ You can issue a CLEAR CODES command
^ A history DTC will clear once 250 malfunction free ignition cycles have occurred

When you issue a scan tool CLEAR CODES command and the malfunction is still present, the DTC will not reappear until the next ignition cycle.

DIAGNOSTIC AIDS
The following can cause an intermittent condition:
^ A short between the passenger frontal high and the passenger frontal low circuits.
^ A malfunctioning shorting bar on the inflatable restraint IP module connector.

If any of the above conditions are found refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
2. This test checks for proper contact or corrosion of the inflatable restraint IP module connector.
5. This step checks for malfunction inflatable restraint IP inflator module.
7. This step checks for high resistance in the passenger frontal high circuit.
9. This step checks for high resistance in the passenger frontal low circuit.