Circuit Description
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 at terminal 7. 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.
Diagnostic Aids
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 Digital Multimeter 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 Intermittent Conditions and Poor Connections in Wiring Systems. When a wire, connector or terminal repair is requested, use the J-38125 Terminal Repair Kit. Refer to Wiring Repairs in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
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Tests for sufficient IGNITION 1 voltage applied to the SDM.
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Tests for excessive IGNITION 1 voltage applied to the SDM.
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Inspects for a properly installed CPA.
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This test determines if the SDM is turning ON the AIR BAG warning lamp.
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This test inspects for a damaged shorting bar.
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This test determines whether the malfunction is a short to ground in CKT 358.
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This test inspects for a short between CKTs 358 and 1751.
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An open AIR BAG Fuse would cause the AIR BAG warning lamp to come ON steady.
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This test inspects whether a short to ground caused the AIR BAG Fuse to open.
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This test determines whether the short to ground is due to a short in the wiring or internal to the SDM.
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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.
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This test inspects for a disconnected SDM.
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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 20 | |
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 Connector Repairs Is the repair complete? | -- | Go to Step 36 | -- |
9 |
Is the shorting bar damaged or corroded? | -- | Go to Step 10 | Go to Step 11 |
10 | Replace the IP harness side of connector C 232. Refer to Connector Repairs . Has the IP harness side of connector C 232 been replaced? | -- | Go to Step 11 | -- |
11 | Inspect for proper connection at terminals A1 and A2 on the IP harness side of connector C 232. Are the terminals damaged or corroded? | -- | Go to Step 12 | Go to Step 13 |
12 | Replace the IP harness side of connector C 232. Refer to Connector Repairs in Wiring Systems. Has the IP harness side of connector been replaced? | -- | Go to Step 13 | -- |
13 | Inspect for proper connection at terminals A1 and A2 on the harness side of connector C 232. Are the terminals damaged or corroded? | -- | Go to Step 14 | Go to Step 15 |
14 | Replace the harness side of connector C 232. Refer to Connector Repairs in Wiring Systems. Has the harness side of connector C 232 been replaced? | -- | Go to Step 36 | -- |
Is the resistance reading less than the specified value? | OL | Go to Step 16 | Go to Step 19 | |
Is the resistance reading less than the specified value? | OL | Go to Step 18 | Go to Step 17 | |
17 | Repair a short to ground condition in CKT 358. Is the repair complete? | -- | Go to Step 37 | -- |
18 |
Is the repair complete? | -- | Go to Step 37 | -- |
19 | Service the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Step 37 | -- |
Is the AIR BAG Fuse good? | -- | Go to Step 29 | Go to Step 21 | |
Is the AIR BAG Fuse good? | -- | Go to Step 28 | Go to Step 22 | |
Is the AIR BAG Fuse good? | -- | Go to Step 27 | Go to Step 23 | |
23 | Does this vehicle have an inflatable restraint IP module switch? | -- | Go to Step 24 | Go to Step 26 |
Is the AIR BAG Fuse good? | -- | Go to Step 25 | Go to Step 26 | |
25 |
Has the inflatable restraint IP module switch been replaced and the AIR BAG Fuse installed? | -- | Go to Step 37 | -- |
26 |
Is the repair complete? | -- | Go to Step 37 | -- |
27 |
Is the repair complete? | -- | Go to Step 37 | -- |
28 | Install the AIR BAG Fuse. Is the repair complete? | -- | Go to Step 37 | -- |
Inspect the SDM harness connector. Is the connector securely connected to the SDM? | -- | Go to Step 31 | Go to Step 30 | |
30 |
Is the repair complete? | -- | Go to Step 37 | -- |
31 |
Is the SDM harness connector terminal damaged or corroded? | -- | Go to Step 32 | Go to Step 33 |
32 | Replace the SDM harness connector. Refer to Connector Repairs . Is the repair complete? | -- | Go to Step 37 | -- |
33 | Inspect the SDM terminals for damage or corrosion. Are any terminals damaged or corroded? | -- | Go to Step 34 | Go to Step 35 |
34 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the repair complete? | -- | Go to Step 30 | -- |
Measure the resistance from the SDM harness connector terminal 10 to each terminal of the AIR BAG Fuse fuse holder. Is either resistance reading within the specified values? | 0-5 ohms | Go to Step 36 | ||
36 | Repair an open condition in CKT 1139. Is the repair complete? | -- | Go to Step 37 | -- |
37 |
Have all SIR components been reconnected and properly mounted? | -- | -- |
