B1015

Circuit Description
When you first turn the ignition switch to the RUN position, the supplemental restraint sensing and diagnostic module (SDM) performs tests in order to diagnose critical malfunctions within the SDM. Upon passing these tests, the following circuits are measured in order to ensure that they are within their respective normal voltage ranges:
- IGNITION 1
- The deployment loop voltages

The SDM proceeds with the RESISTANCE MEASUREMENT test. During one portion of the RESISTANCE MEASUREMENT test, the SDM performs the following steps:
- Grounds the PASSENGER SIDE LOW terminal 4 through an internal current sink
- Connects the PASSENGER SIDE HIGH terminal 1 to an internal constant current source
This current produces proportional voltage drops in the deployment loop.
- Measures the voltage difference between PASSENGER SIDE HIGH and PASSENGER SIDE LOW
- Calculates the resistance of the passenger deployment loop using the measured voltage

Conditions for Setting the DTC
- The driver and passenger deployment loops are not open.
- The driver and passenger deployment loops are not shorted to voltage.
- The passenger deployment loop is not shorted to ground.
- The passenger deployment loop resistance is more than 3.0 OHM. The passenger deployment loop consists of the following components:
- The supplemental restraint IP module
- The harness wiring of CKT 1403
- The harness wiring of CKT 1404
- The connector terminal contact

The RESISTANCE MEASUREMENT test inspects for this malfunction. When IGNITION 1 is within the normal operating voltage range, this test occurs during each ignition cycle.

Action Taken When the DTC Sets
- The SDM sets a diagnostic trouble code.
- The SDM turns the AIR BAG warning lamp to the ON position.

Conditions for Clearing the DTC
Current DTC
- The resistance of the passenger deployment loop is less than 3.0 OHM.
- The ignition switch cycles.

History DTC
- You issue a scan tool CLEAR CODES command.
- The 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
A poor connection may cause an intermittent condition. Inspect the following items for a poor connection:
- The supplemental restraint IP module harness connector terminal A and terminal B
- The SDM terminal 1 and terminal 4
- The wire to terminal connections in CKT 1403
- The wire to terminal connections in CKT 1404

The diagnostic table directs the technician to note the entry value of the PASSENGER RESISTANCE. Comparing the value of PASSENGER RESISTANCE over multiple ignition cycles may be helpful in determining if an intermittent condition exists.

When measurements are requested in this table, use J 39200 Digital Multimeter with the correct terminal adapter from J 35616-A Connector Test Adapter Kit. When an inspection for proper connection is requested, refer to Intermittents and Poor Connections. When a wire, connector or terminal repair is requested, use J 38125-B Terminal Repair Kit and refer to Wiring Repair.

Step 1:

Steps 2 - 5:

Steps 6 - 9:

Steps 10 - 12:

Steps 13 - 19:

Steps 20 - 22:

Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This test determines the deployment loop resistance measured by the supplemental restraint sensing and diagnostic module (SDM).
3. This test inspects for proper contact or corrosion of the yellow 2-way connector.
10. This test isolates the malfunction to one side of the supplemental restraint IP module yellow 2-way connector.
12. This test inspects for proper contact or corrosion of the SDM connector.
17. This test determines whether the malfunction is in CKT 1403.
19. This test determines whether the malfunction is in CKT 1404.