When the ignition switch is first turned to the RUN position, the GAUGES Fuse applies battery voltage to the AIR BAG warning lamp that is connected to Air Bag Indicator Control, terminal 7. Circuit 39 supplies battery voltage to the IGNITION 1 input, terminal 10. The inflatable restraint sensing and diagnostic module (SDM) responds by flashing the AIR BAG warning lamp 7 times. If IGNITION 1 is outside of the normal operating voltage range (8.2-17.1 volts), the AIR BAG warning lamp will come ON solid with no DTCs set.
In order to disable the shorting bar from terminal 6 to terminal 7 inside the inflatable restraint sensing and diagnostic module (SDM) harness connector, the following 2 conditions must be met:
• | The SDM harness connector must be properly connected to the SDM. |
• | The connector position assurance (CPA) must be properly installed in the SDM harness connector. |
When measurements are requested in this table, use the J 39200 DMM with the correct terminal adapter from the J 35616 Connector Test Adapter Kit. When an inspection for proper connection is requested, refer to Testing for Electrical Intermittents in Wiring Systems. When a wire, connector or terminal repair is requested, use the J-38125 Terminal Repair Kit and refer to Wiring Repairs in Wiring Systems.
The numbers below refer to the step numbers on the diagnostic table:
This test inspects for sufficient IGNITION 1 voltage applied to the SDM.
This test inspects for excessive IGNITION 1 voltage applied to the SDM.
This test inspects for a properly installed CPA.
This test determines if the SDM is turning on the AIR BAG warning lamp.
This test inspects for a damaged shorting bar.
This test determines whether the malfunction is a short to ground in CKT 358.
This test inspects for a short between CKTs 358 and 1751.
An open AIR BAGS Fuse would cause the AIR BAG warning lamp to come on steady.
This test inspects whether a short to ground caused the AIR BAGS Fuse to open.
This test determines whether the short to ground is due to a short in the wiring or internal to the SDM.
This test inspects for a disconnected SDM.
This test inspects for an open in the IGNITION 1 circuit.
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | Go to Step 2 | |
Is IGNITION more than the specified value? | 8.2 V | Go to Step 3 | Go to Step 14 | |
Is IGNITION more than the specified value? | 17.1 V | Go to Charging System Check in Engine Electrical | Go to Step 4 | |
Is the CPA properly installed? | -- | Go to Step 6 | Go to Step 5 | |
5 | Properly install the CPA. Is the repair complete? | -- | -- | |
Does the AIR BAG warning lamp come ON steady? | -- | Go to Step 7 | ||
Is the shorting bar damaged or corroded? | -- | Go to Step 8 | Go to Step 9 | |
8 | Replace the SDM harness connector. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the repair complete? | -- | Go to Step 28 | -- |
Is the resistance reading less than the specified value? | OL | Go to Step 10 | Go to Step 13 | |
Is the resistance reading less than the specified value? | OL | Go to Step 12 | Go to Step 11 | |
11 | Repair a short to ground condition in CKT 358. Is the repair complete? | -- | Go to Step 28 | -- |
12 |
Is the repair complete? | -- | Go to Step 28 | -- |
13 | Service the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Step 28 | -- |
Is the AIR BAGS Fuse good? | -- | Go to Step 20 | Go to Step 15 | |
Is the AIR BAGS Fuse good? | -- | Go to Step 19 | Go to Step 16 | |
Is the AIR BAGS Fuse good? | -- | Go to Step 18 | Go to Step 17 | |
17 |
Is the repair complete? | -- | Go to Step 28 | -- |
18 |
Is the repair complete? | -- | Go to Step 28 | -- |
19 | Install the AIR BAGS Fuse. Is the repair complete? | -- | Go to Step 28 | -- |
Inspect the SDM harness connector. Is the connector secure? | -- | Go to Step 22 | Go to Step 21 | |
21 |
Is the repair complete? | -- | Go to Step 28 | -- |
22 |
Is the SDM harness connector terminal damaged or corroded? | -- | Go to Step 23 | Go to Step 24 |
23 | Replace the SDM harness connector. Refer to Wiring Repair . Is the repair complete? | -- | Go to Step 28 | -- |
24 | Inspect the SDM terminals for damage or corrosion. Are any terminals damaged or corroded? | -- | Go to Step 25 | Go to Step 26 |
25 | Replace the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the repair complete? | -- | Go to Step 28 | -- |
Measure the resistance from the SDM harness connector terminal 10 to each terminal of the AIR BAGS Fuse fuseholder. Is either resistance reading within the specified values? | 0-5 ohms | Go to Step 27 | ||
27 | Repair an open condition in CKT 1139. Is the repair complete? | -- | Go to Step 28 | -- |
28 |
Have all the SIR components been reconnected and properly mounted? | -- | -- |