Circuit Description
When you first turn the ignition switch to the RUN position, the supplemental restraint sensing and diagnostic module (SDM) performs tests in order to diagnose critical malfunctions within itself. Upon passing these tests, the IGNITION 1 voltage is measured in order to ensure that IGNITION 1 is within the respective normal voltage range. The SDM then performs the DEPLOYMENT LOOP CONTINUITY test. During the DEPLOYMENT LOOP CONTINUITY test, the SDM measures the voltage difference between the PASSENGER SIDE HIGH and the PASSENGER SIDE LOW.
Conditions for Setting the DTC
| • | The voltage difference between the PASSENGER SIDE HIGH terminal 1 and the PASSENGER SIDE LOW terminal 4 is more than or equal to 400 millivolts. |
| • | The malfunction must be present for at least 500 milliseconds during one of the following tests: |
| - | DEPLOYMENT LOOP CONTINUITY |
| - | If the malfunction is detected in this test, the RESISTANCE MEASUREMENT test will not be performed. |
| - | CONTINUOUS MONITORING |
Action Taken When the DTC Sets
| • | The SDM sets a diagnostic trouble code. |
| • | The SDM turns the AIR BAG warning lamp to the ON position. |
Conditions for Clearing the DTC
| • | Current DTC |
| The voltage difference between PASSENGER SIDE HIGH terminal 1 and PASSENGER SIDE LOW terminal 4 is less than 400 millivolts for 500 milliseconds. |
| • | History DTC |
| - | You issue a scan tool CLEAR CODES command. |
| - | After 250 malfunction free ignition cycles have occurred. |
Diagnostic Aids
The following items may cause an intermittent condition:
| • | A poor connection at the supplemental restraint IP module harness connector terminal A and terminal B |
| • | A poor connection at the SDM terminal 1 and terminal 4 |
| • | An open in CKT 1403 |
| • | An open in CKT 1404 |
When measurements are requested in this table, use J 39200 Digital Multimeter with the correct terminal adapter from J 35616 Connector Test Adapter Kit. When an inspection for proper connection is requested, refer to Intermittents and Poor Connections . When a wire, connector or terminal repair is requested, use J-38125 Terminal Repair Kit and refer to Wiring Repair .
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
This test determines the deployment loop voltage difference measured by the supplemental restraint sensing and diagnostic module (SDM).
-
This test inspects for proper contact or corrosion of the yellow 2-way connector.
-
This test isolates the malfunction to one side of the supplemental restraint IP module yellow 2-way connector.
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This test inspects for proper contact or corrosion of the SDM harness connector.
-
This test determines whether the malfunction is in CKT 1403.
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This test determines whether the malfunction is in CKT 1404.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the SRS Diagnostic System Check performed? | -- | Go to Step 2 | |
Has the PASSENGER VDIF been read and recorded on the repair order? | -- | Go to Step 3 | -- | |
Are the terminals damaged or corroded? | -- | Go to Step 4 | Go to Step 6 | |
4 | Replace the supplemental restraint IP module yellow 2-way IP harness connector. Refer to Wiring Repair . Is the repair complete? | -- | Go to Step 5 | -- |
5 | Inspect for proper connection at terminals A and B on the supplemental restraint IP module yellow 2-way jumper connector. Are the terminals damaged or corroded? | -- | Go to Step 7 | Go to Step 21 |
6 | Inspect for proper connection at terminals A and B on the supplemental restraint IP module yellow 2-way jumper connector. Are the terminals damaged or corroded? | -- | Go to Step 7 | Go to Step 8 |
7 | Replace the supplemental restraint IP module. Refer to Supplemental Restraint Instrument Panel Module Replacement . Is the repair complete? | -- | Go to Step 21 | -- |
8 |
Is the PASSENGER VDIF less than the specified value? | 400 mV | Go to Step 9 | Go to Step 10 |
9 |
Is the repair complete? | -- | Go to Step 21 | -- |
Is the PASSENGER VDIF less than the specified value? | 400 mV | Go to Step 11 | Go to Step 12 | |
11 |
Is the repair complete? | -- | Go to Step 21 | -- |
Is the connector damaged or corroded? | Go to Step 13 | Go to Step 15 | ||
13 | Replace the SDM harness connector. Refer to Wiring Repair . Is the repair complete? | -- | Go to Step 14 | -- |
14 | Inspect for proper connection at terminals 1 and 4 of the SDM. Are the terminals damaged or corroded? | -- | Go to Step 16 | Go to Step 21 |
15 | Inspect for proper connection at terminals 1 and 4 of the SDM. Are the terminals damaged or corroded? | -- | Go to Step 16 | Go to Step 17 |
16 | Replace the SDM. Refer to Supplemental Restraint Sensing and Diagnostic Module Replacement . Is the repair complete? | -- | Go to Step 21 | -- |
Is the resistance reading within the specified values? | 0-0.5 ohms | Go to Step 19 | Go to Step 18 | |
18 | Repair the high resistance condition in CKT 1403. Is the repair complete? | -- | Go to Step 21 | -- |
Measure the resistance from the SDM harness connector terminal 4 to the supplemental restraint IP module yellow 2-way harness connector terminal B. Is the resistance reading within the specified values? | 0-0.5 ohms | Go to Step 20 | ||
20 | Repair the high resistance condition in CKT 1404. Is the repair complete? | -- | Go to Step 21 | -- |
21 |
Have all of the RS components been reconnected and properly mounted? | -- | Go to Step 22 | -- |
22 | Clear all the SRS DTCs. Have all the SRS DTCs been cleared? | -- | -- |
