B1025

When measurements are requested in this table, use J 39200 DVM with the correct terminal adapter from J 35616-A CONNECTOR TEST ADAPTER KIT. When a check for proper connection is requested, refer to Intermittents and Poor Connections in Diagram Information in Diagrams. When a wire, connector or terminal repair is requested, use J 38125-A TERMINAL REPAIR KIT and refer to Wiring Repair.

CIRCUIT DESCRIPTION
When you first turn the ignition switch to the RUN position the inflatable restraint Sensing and Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within itself. Upon passing these tests IGNITION 1, 23 VLR and deployment loop voltages are measured to make sure they are within their respective normal voltage ranges. The SDM monitors the voltages at DRIVER SIDE LOW terminal 3 and PASS SIDE LOW terminal 4 to detect shorts to B+ in the inflator module circuits.

CONDITIONS FOR SETTING THE DTC
^ The voltage at PASS SIDE LOW terminal 4 is less than 4.8 volts.
^ The voltage at DRIVER SIDE LOW terminal 3 is greater than 4.8 volts for 500 milliseconds.

The CONTINUOUS MONITORING test checks for this DTC. This test occurs 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 ON the AIR BAG warning. lamp.

CONDITIONS FOR CLEARING THE DTC
^ Current DTC.
The voltage at DRIVER SIDE LOW terminal 3 is less than 4.8 volts tar 500 milliseconds.
^ History DTC.
- You issue a scan tool CLEAR CODES command.
- Once 250 malfunction free ignition cycles have occurred.

DIAGNOSTIC AIDS
A short-to-B+ in the inflatable restraint steering wheel module circuit can cause an intermittent condition. Inspect CKT 347 and CKT 348 carefully for cutting or chafing.

The diagnostic table directs the technician to note the entry value of DRIVER SENSELO. Comparing the value of DRIVER SENSELO can be helpful in determining if an intermittent condition exists.

DTC TABLE TEST DESCRIPTION
Number(s) below refer to step number(s) on the diagnostic table.
2. This test determines the driver side low voltage measured by the SDM.
3. This test isolates the malfunction to one side of the inflatable restraint steering wheel module coil yellow 2-way connector located near the base of the steering column. This is done by substituting the known good resistance of the load tool and then observing if the malfunction is still present.
4. This test determines whether the malfunction is in the inflatable restraint steering wheel module coil or the inflatable restraint steering wheel module.
7. This test determines whether the malfunction is in CKT 347.
9. This test determines whether the malfunction is in CKT 348.