B1016

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 itself. Upon passing these tests, the following circuits are measured in order to ensure that they are within their respective normal voltage ranges:
- IGNITION 1
- Deployment loop voltages

The SDM then performs 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 the PASSENGER SIDE HIGH and the 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 less than 1.4 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. This test occurs once each ignition cycle when IGNITION 1 is within the normal operating voltage range.

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 more than 1.4 OHM.
- The ignition switch is cycled.
- History DTC
- A scan tool CLEAR CODES command is issued.
- After 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 Aid
The following items may cause an intermittent condition:
- A short circuit between CKT 1403 and CKT 347
- A short circuit between CKT 1403 and CKT 348
- A short circuit between CKT 1403 and CKT 1404
- A malfunctioning shorting bar on the supplemental restraint IP module connector

The diagnostic table directs the technician to note the entry value of the PASSENGER RESISTANCE. Compare the value of the PASSENGER RESISTANCE over the multiple ignition cycles in order to help determine an existing intermittent condition.

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.

Steps 1 - 3:

Steps 4 - 5:

Steps 6 - 7:

Steps 8 - 13:

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).
6. This test isolates the malfunction to one side of the supplemental restraint IP module yellow 2-way connector.
8. This test inspects for a short from CKTs 1403 to 1404.
10. This test inspects for a short from CKTs 1403 to 348.