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. The SIR Fuse applies 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 volts-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 determines whether an open SIR Fuse caused the AIR BAG warning lamp to come ON steady.
This test inspects whether a short to ground caused the SIR 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 determines whether the short to ground is due to a short in the wiring or internal to the inflatable restraint IP module switch.
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 12 | |
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 Wiring Repair . Is the repair complete? | -- | Go to Step 28 | -- |
Is the resistance reading less then the specified value? | OL | Go to Step 10 | Go to Step 11 | |
10 | Repair a short to ground condition in CKT 358. Is the repair complete? | -- | Go to Step 29 | -- |
11 | Service the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Step 29 | |
Is the SIR Fuse good? | -- | Go to Step 21 | Go to Step 13 | |
Is the SIR Fuse good? | -- | Go to Step 20 | Go to Step 14 | |
Is the SIR Fuse good? | -- | Go to Step 19 | Go to Step 15 | |
15 | Does this vehicle have an inflatable restraint IP module switch? | -- | Go to Step 16 | Go to Step 18 |
Is the SIR Fuse good? | -- | Go to Step 17 | Go to Step 18 | |
17 |
Has the inflatable restraint IP module switch been replaced and the SIR Fuse installed? | -- | Go to Step 29 | -- |
18 |
Is the repair complete? | -- | Go to Step 29 | -- |
19 |
Is the repair complete? | -- | Go to Step 29 | -- |
20 | Install the SIR Fuse. Is the repair complete? | -- | Go to Step 29 | -- |
Inspect the SDM harness connector. Is the connector securely connected to the SDM? | -- | Go to Step 23 | Go to Step 22 | |
22 |
Is the repair complete? | -- | Go to Step 29 | -- |
23 |
Is the SDM harness connector terminal damaged or corroded? | -- | Go to Step 24 | Go to Step 25 |
24 | Replace the SDM harness connector. Refer to Wiring Repair . Is the repair complete? | -- | Go to Step 29 | -- |
25 | Inspect the SDM terminals for damage or corrosion. Are any terminals damaged or corroded? | -- | Go to Step 26 | Go to Step 27 |
26 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the repair complete? | -- | Go to Step 22 | -- |
Measure the resistance from the SDM harness connector terminal 10 to each terminal of the SIR Fuse fuseholder. Is either resistance reading within the specified values? | 0-5 ohms | Go to Step 29 | ||
28 | Repair an open condition in CKT 1139. Is the repair complete? | -- | Go to Step 29 | -- |
29 |
Have all of the SIR components been reconnected and properly mounted? | -- | -- |