Circuit Description
In the ON position, the ignition switch applies battery voltage to the AIR BAG warning lamp and to the IGNITION 1 input terminal 10. The inflatable restraint sensing and diagnostic module responds by flashing the AIR BAG warning lamp seven times. The inflatable restraint sensing and diagnostic module monitors the voltage levels at the PASSENGER AIR BAG Enable terminal 11 and PASSENGER AIR BAG DISABLE terminal 12 of the inflatable restraint sensing and diagnostic module to determine the position of the inflatable restraint IP module switch.
Conditions for Setting the DTC
| • | The voltage detected at PASSENGER AIR BAG ENABLE terminal 11 and PASSENGER AIR BAG DISABLE terminal 12 are less than 1.0 volt when the AIR BAG ON lamp is commanded on. |
| • | The voltage detected at PASSENGER AIR BAG ENABLE terminal 11 and PASSENGER AIR BAG DISABLE terminal 12 are greater than 4.0 volts when the AIR BAG ON lamp is commanded OFF. |
| • | The voltage detected at PASSENGER AIR BAG ENABLE terminal 11 and PASSENGER AIR BAG DISABLE terminal 12 are greater than 1.0 volt when the AIR BAG OFF lamp is commanded ON. |
Action Taken When the DTC Sets
| • | The inflatable restraint Sensing and Diagnostic Module (SDM) attempts to illuminate the AIR BAG OFF lamp. |
| • | The inflatable restraint IP module switch is defaulted to the disabled state. |
| • | The SDM sets a diagnostic trouble code. |
| • | The SDM turns ON the AIR BAG warning lamp. |
Conditions for Clearing the DTC
| • | Current DTC: The voltage at PASSENGER AIR BAG ENABLE terminal 11 is greater than 4.0 volts for 500 milliseconds and the voltage at PASSENGER AIR BAG DISABLE terminal 12 is less than 1.0 volts for 500 milliseconds when the AIR BAG ON lamp is commanded ON. |
| • | History DTC: |
| - | You issue a scan tool CLEAR CODES command. |
| - | Once 250 malfunction free ignition cycles have occurred |
Diagnostic Aids
Refer to AIR BAG Warning Lamp Comes On Steady and AIR BAG Warning Lamp Does Not Come On to diagnose warning lamp circuit malfunctions.
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.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
This test determines if the AIR BAG ON lamp illuminates when the IP module switch is in the ON position.
-
This test checks for a poor connection at the yellow 6-way IP module switch harness connector.
-
This test determines whether the malfunction is in CKT 1050.
-
This test determines whether the malfunction is in CKT 1139 between the fuse block and the IP module switch.
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This test determines if the state of terminal 11 of the SDM (Pass Air Bag Enable) is correct when the IP module switch is in the ON position.
-
This test checks for proper contact or corrosion of the SDM harness connector.
-
This test checks for an open circuit in CKT 371.
-
This test checks for a short to ground in CKT 371.
-
This test determines if the state of terminal 12 of the SDM (Pass Air Bag Disable) is correct when the IP module switch is in the ON position.
-
This test checks for a short to voltage in CKT 353.
-
This test checks for a short circuit between CKT 353 and 371.
-
This test determines if the AIR BAG OFF lamp illuminates when the IP module switch is in the OFF position.
-
This test checks for a short to voltage in CKT 353.
-
This test checks for a short to voltage in CKT 371.
-
This test checks for an open circuit in CKT 353.
-
This test determines if the state of terminal 11 of the SDM (Pass Air Bag Enable) is correct when the IP module switch is in the OFF position.
-
This test determines if the state of terminal 12 of the SDM (Pass Air Bag Disable) is correct when the IP module switch is in the OFF position.
-
This test determines if the state of the internal SDM suppression lamp driver is correct when the IP module switch is in the OFF position.
-
This test checks for a short to ground in CKT 353.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SIR Diagnostic System Check performed? | -- | ||
Does the AIR BAG ON lamp illuminate in the IP module switch? | -- | |||
Is the yellow 6-way IP module switch harness connector properly connected to the IP module switch? | -- | |||
4 | Connect the yellow 6-way IP module switch harness connector securely to the IP module switch. Is the yellow 6-way IP module switch harness connector securely connected to the IP module switch? | -- | -- | |
5 |
Are the terminals damaged or corroded? | -- | ||
6 | Repair the yellow 6-way IP module switch harness connector. Refer to Wiring Repair . Is the repair complete? | -- | -- | |
7 | Carefully inspect the IP module switch terminals for damage or corrosion. Are the terminals damaged or corroded? | -- | ||
Is the resistance reading greater than the specified values? | 5 ohms | |||
9 | Repair a high resistance or open circuit in CKT 1050 between the yellow 6-way IP module switch harness connector terminal F and ground (G203). Is the repair complete? | -- | -- | |
Is the voltage reading greater than the specified values? | 1 V | |||
11 |
Is the repair complete? | -- | -- | |
12 |
Has the IP module switch been reconnected? | -- | -- | |
Does Pass Air Bag IP module show the specified level? | High | |||
Is the SDM harness connector damaged or corroded? | -- | |||
15 | Check for proper connection at terminals 11 and 12 on the SDM. Are the SDM terminals damaged or corroded? | -- | ||
Is the resistance reading greater than the specified values? | 5 ohms | |||
17 | Repair a high resistance or open circuit condition in CKT 371. Is the repair complete? | -- | -- | |
Measure the resistance from the yellow 6-way IP module switch harness connector terminal A to terminal F (ground). Is the resistance reading less than the specified values? | OL | |||
19 | Repair a short to ground condition in CKT 371. Is the repair complete? | -- | -- | |
20 |
Have the SIR components been reconnected? | -- | -- | |
Does Pass Air Bag Disable show the specified level? | Low | |||
22 |
Is the SDM harness connector damaged or corroded? | -- | ||
23 | Check for proper connection at terminals 11 and 12 on the SDM. Are the SDM terminals damaged or corroded? | -- | ||
Is the voltage reading greater than the specified values? | 1 V | |||
25 |
Is the repair complete? | -- | -- | |
Is the resistance reading less than the specified values? | OL | |||
27 | Repair a short circuit between CKT 353 and CKT 371. Is the repair complete? | -- | -- | |
Does the AIR BAG OFF lamp illuminate in the IP module switch? | -- | |||
29 |
Is the yellow 6-way IP module switch harness connector properly connected to the IP module switch? | -- | ||
30 | Connect the yellow 6-way IP module switch harness connector securely to the IP module switch. Is the yellow 6-way IP module switch harness connector securely connected to the IP module switch? | -- | -- | |
31 |
Are the terminals damaged or corroded? | -- | ||
32 | Repair the yellow 6-way IP module switch harness connector. Refer to Wiring Repair . Is the repair complete? | -- | -- | |
33 | Carefully inspect the IP module switch terminals for damage or corrosion. Are the terminals damaged or corroded? | -- | ||
34 |
Is the SDM harness connector damaged or corroded? | -- | ||
35 | Replace the SDM harness connector. Refer to Wiring Repair . Has the SDM harness connector been replaced? | -- | ||
36 | Check for proper connection at terminals 11 and 12 on the SDM. Are the SDM terminals damaged or corroded? | -- | ||
37 | Check for proper connection at terminals 11 and 12 on the SDM. Are the SDM terminals damaged or corroded? | -- | ||
38 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Has the SDM been replaced? | -- | -- | |
Is the voltage reading greater than the specified values? | 1 V | |||
40 |
Is the repair complete? | -- | -- | |
Measure the voltage from the yellow 6-way IP module switch harness connector terminal A to terminal F (ground). Is the voltage reading greater than the specified values? | 1 V | |||
42 |
Is the repair complete? | -- | -- | |
Is the resistance reading greater than the specified values? | 5 ohms | |||
44 | Repair a high resistance or open circuit condition in CKT 353 Is the repair complete? | -- | -- | |
45 |
Have the SIR system components been reconnected? | -- | -- | |
Does Pass Air Bag IP module show the specified level? | Low | |||
Does Pass Air Bag Disable show the specified level? | Low | |||
Does Suppression Lamp Driver show the specified level? | On | |||
Is the resistance reading less then the specified values? | OL | |||
50 | Repair a short to ground condition in CKT 353. Is the repair complete? | -- | -- | |
51 | Replace the inflatable restraint IP module switch. Refer to Inflatable Restraint Instrument Panel Module Disable Switch Replacement . Is the repair complete? | -- | -- | |
52 | Reconnect all the SIR system components. Make sure all the SIR system components are properly mounted. Have all the SIR components been reconnected and properly mounted? | -- | -- | |
53 | Clear the SIR diagnostic trouble codes. Have all the SIR diagnostic trouble codes been cleared? | -- | -- |
