AIR BAG Warning Lamp Comes On Steady

Diagnostic Chart (Part 1 Of 4):

Diagnostic Chart (Part 2 Of 4):

Diagnostic Chart (Part 3 Of 4):

Diagnostic Chart ( Part 4 Of 4):

Wiring Diagram:

CIRCUIT DESCRIPTION
The ignition switch supplies Ignition 1 voltage to the inflatable restraint Sensing And Diagnostic Module (SDM) at terminal A1 using the AIR BAG fuse. The ignition switch also supplies Ignition 1 voltage to the AIR BAG warning indicator using the IG fuse. The AIR BAG warning indicator is connected to the AIR BAG indicator control terminal A9 of the SDM. When the ignition switch is first turned to the ON position, the SDM responds by flashing the AIR BAG warning indicator seven times. If Ignition 1 is outside of the normal operating voltage range (9.0 volts- 16.0 volts) for more than 25 ms, the AIR BAG warning indicator will come ON solid with no DTCs set.

DIAGNOSTIC AIDS
In order to disable the shorting bar from terminal A9 to terminal A18 inside the inflatable restraint sensing and diagnostic module (SDM) wiring harness connector, the following two conditions must be met:
^ The SDM wiring harness connector must be properly connected to the SDM.
^ The Connector Position Assurance (CPA) must be properly installed in the SDM wiring harness connector.

When measurements are requested in this table, use the J 39200 DMM with the correct terminal adapter from the J 35616-A Connector Test Adapter Kit.

When an inspection for proper connection is requested, refer to Testing for Intermittent and Poor Connections in Wiring Systems. When a wire, connector or terminal repair is requested, use the J 38125-B Terminal Repair Kit and refer to Wiring Repairs in Diagrams.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
2. This step checks to see if the scan tool can communicate with the inflatable restraint sensing and diagnostic module (SDM).
3. This step checks to see if sufficient ignition voltage is applied to the SDM.
4. This step checks to see if excessive ignition voltage is applied to the SDM.
5. This step checks to see if the retainer assembly or the shorting bar is damaged or corroded.
7. This step checks to see if the SDM wiring harness connector terminals are damaged or corroded.
9. This step checks to see if the SDM terminals are damaged or corroded or if the lifting tab on the SDM is damaged.
10. This step checks to see if the SDM wiring harness connector properly connects to the SDM and if the Connector Position Assurance (CPA) is properly installed.
13. This step checks to see if there is a short to ground in the AIR BAG warning indicator control circuit.
14. This step determines if there is a short between the AIR BAG warning indicator control circuit and the SDM ground circuit or if there is a short to ground in the AIR BAG warning indicator control circuit.
18. This step checks to see if the AIR BAG fuse is not open. An open SIR Fuse would cause the AIR BAG warning indicator to come ON steady.
19. This step checks to see if a short to ground caused the AIR BAG use to open.
20. This step checks for a short to ground in AIR BAG fuse feed circuit.
23. This step checks to see if the SDM wiring harness connector properly secures to the SDM.
29. This step checks to see if there is an open in AIR BAG fuse feed circuit.
31. This step determines if there is an open or a high resistance condition in the B+ feed circuit to the input side of the AIR BAG fuse or if there is a malfunctioning SDM.