Supplemental Inflatable Restraint (SIR)

When measurements are requested in this chart, use SA 91114NE DVM with correct terminal adapter from SA 9206Z When a check for proper connection is requested, refer to "Intermittents and Poor Connections." When a wire connector or terminal repair is requested, use the proper repair parts and refer to "Wiring Repair."

CAUTION: BEFORE PERFORMING DIAGNOSTICS, THE IGNITION SWITCH MUST BE IN THE "OFF" POSITION FOR 10 MINUTES (REFER TO DISABLING AND ENABLING PRECAUTIONS).

CIRCUIT DESCRIPTION
When the ignition switch is first turned On, battery voltage is applied to the AIR BAG telltale lamp and to the "Ignition 1" input terminal A10. The Sensing and Diagnostic Module (SDM) responds by flashing the AIR BAG telltale lamp seven times alternating between the primary and redundant lamp drivers. The SDM monitors the primary lamp driver output by comparing the output state at "AIR BAG" terminal A7 to the microprocessor commanded state.

DTC WILL SET WHEN:
"Ignition 1" voltage is above a specified value and the output state at the "AIR BAG" terminal A7 does not match the commanded state. This test is run every 100 milliseconds during "Continuous Monitoring" and "Current Source Diagnostics."

ACTION TAKEN:
SDM turns On the AIR BAG telltale lamp and sets DTC 61.

DTC WILL CLEAR WHEN:
The malfunction is no longer occurring and the ignition switch is turned Off, or a Scan tool "Clear Codes" command is issued.

DIAGNOSTIC AIDS:
Refer to Charts B and C to diagnose AIR BAG telltale lamp circuit malfunctions. Table B Air Bag Warning Lamp Comes On Steady
Table C Air Bag Warning Lamp Does Not Come On

Make sure the SDM harness connector, strain relief, and CPA are assembled correctly. If they are not, the "AIR BAG" telltale lamp will come On steady and DTC 61 will remain current. (Refer to illustration).