Circuit Description
During the Turn On test, performed at the beginning of each ignition cycle, the inflatable restraint Diagnostic Energy Reserve Module (DERM) delays the charging of the Driver 36 VLR power supply. While the delay is active the DERM measures the voltage at the Driver 36 VLR terminal A4 and the Driver Source Sense terminal A5. When the voltage measured at the Driver 36 VLR power supply indicates it is in a discharged state and the voltage measured at Driver Source Sense is a specified amount below Ignition 1 voltage, DTC B1034 is set.
Conditions for Setting the DTC
With the Driver 36 VLR power supply in a discharged state, the voltage measured at the Driver Source Sense terminal A5 is a specified amount below Ignition 1 voltage and no higher priority faults are detected. This test is run once each ignition cycle during the Turn On test while the 36 VLR delay is active.
Action Taken When the DTC Sets
The DERM turns on the AIR BAG warning lamp and sets a diagnostic trouble code.
Conditions for Clearing the DTC
With the Driver 36 VLR power supply in a discharged state the voltage measured at the Driver Source Sense terminal A5 is within the specified range of the Ignition 1 voltage. When the set are not met, the state of the diagnostic trouble code from the previous ignition cycle is used. When the clear conditions are not met, the state of the diagnostic trouble code from the previous ignition cycle is used.
Diagnostic Aids
An intermittent condition may be caused by one of the following:
| • | An improper connection at the inflatable restraint arming sensor connector terminal A or C. |
| • | An improper connection at the inflatable restraint arming sensor jumper harness electrical connector terminal A or terminal C |
| • | An improper connection at the DERM terminal A5 |
| • | An open ignition feed to the inflatable restraint arming sensor |
| • | An open Driver Source Sense circuit |
| • | A malfunctioning inflatable restraint arming sensor ignition diode |
The test for this diagnostic trouble code is only run while the AIR BAG warning lamp is performing the bulb check. When a scan tool clear codes command is issued and the malfunction is still present, the DTC will not reappear until the ignition switch is turned OFF for at least two minutes with the entire SIR system connected and then the ignition switch is turned ON.
Test Description
Refer to step numbers on the diagnostic table.
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Start at the SIR Diagnostic System Check for all diagnosis.
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This test checks whether a malfunction is occurring.
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This test checks for a open in the inflatable restraint arming sensor ignition feed circuit.
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This test locates the open in the inflatable restraint arming sensor ignition feed circuit.
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This test determines whether the malfunction is an open in the Driver Source Sense circuit or an open in the inflatable restraint arming sensor.
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This test locates the open in the Driver Source Sense circuit.
When measurements are requested in this chart use J 39200 Digital Multimeter with correct terminal adapter from J 35616 Connector Test Adapter Kit. When a check for proper connection is requested, refer to Intermittents and Poor Connections in Section 8A4. When a wire, connector or terminal repair is requested, use J-38125 Terminal Repair Kit and refer to Wiring Repair.
Step | Action | Value | Yes | No |
|---|---|---|---|---|
Was the SIR Diagnostic System Check performed? | -- | |||
2 |
Is the DERM electrical harness connector damaged or corroded? | -- | ||
3 | Repair the DERM electrical harness connector. Has the connector been repaired? | -- | -- | |
4 | Check for proper connection to the DERM at terminal A5. Are the DERM terminals damaged or corroded? | -- | ||
5 | Check for proper connection to DERM at terminal A5. Are the DERM terminals damaged or corroded? | -- | ||
6 | Replace the DERM. Refer to Inflatable Restraint Diagnostic Energy Reserve Module Has the DERM been replaced? | -- | -- | |
Is the voltage about equal to the value specified? | 12 V | Go to Integrity Check | ||
8 |
Is the inflatable restraint arming sensor electrical harness connector damaged or corroded? | -- | ||
9 | Replace the inflatable restraint arming sensor electrical connector. Has the connector been replaced? | -- | -- | |
10 | Check for proper connection to the inflatable restraint arming sensor at terminals A and C. Are the inflatable restraint arming sensor terminals damaged or corroded? | -- | ||
11 | Check for proper connection to the inflatable restraint arming sensor at terminals A and C. Are the inflatable restraint arming sensor terminals damaged or corroded? | -- | ||
12 | Replace the inflatable restraint arming sensor. Refer to Inflatable Restraint Arming Sensor . Has the inflatable restraint arming sensor been replaced? | -- | -- | |
Is the voltage about equal to the value specified? | 12 V | |||
14 |
Is the inflatable restraint arming sensor electrical jumper harness connector damaged or corroded? | -- | ||
15 | Repair the inflatable restraint arming sensor jumper harness electrical connector C110. Has the connector been repaired? | -- | -- | |
Is the voltage about equal to the value specified? | 12 V | |||
17 | Repair the open in circuit 1139 in the inflatable restraint arming sensor jumper harness. Has the open circuit been repaired? | -- | -- | |
18 | Repair the open in circuit 1139 between the inflatable restraint arming sensor jumper harness electrical connector and S260. Has the open circuit been repaired? | -- | -- | |
Is the resistance less than the value specified? | 5 ohms | |||
20 |
Is the connector terminal C damaged or corroded? | -- | ||
21 | Repair the inflatable restraint arming sensor jumper harness electrical connector C110. Has the connector been repaired? | -- | -- | |
Measure the resistance of circuit 1400 from the inflatable restraint arming sensor jumper harness electrical connector C110 terminal C to the DERM electrical harness connector terminal A5. Is the resistance less than the value specified? | 5 ohms | |||
23 | Repair the high resistance in circuit 1400 in the inflatable restraint arming sensor jumper harness. Has the high resistance been repaired? | -- | -- | |
24 | Repair the open in circuit 1400 in the SIR wiring harness. Has the open been repaired? | -- | -- | |
25 |
Have all the SIR system components been reconnected and properly mounted? | -- | -- | |
26 | Clear the SIR Diagnostic Trouble Codes. Have the SIR Diagnostic Trouble Codes been cleared? | -- | -- |
