Circuit Description
During normal, non-deployment operation of the SIR system, a small amount of current flows through the driver deployment loop. The diagnostic resistors within the inflatable restraint arming sensor and the inflatable restraint discriminating sensors along with the resistance of the inflatable restraint steering wheel inflator module causes voltage drops within the deployment loop. The inflatable restraint Diagnostic Energy Reserve Module (DERM) monitors the voltage at the Driver Side Low terminal B8 to detect shorts or opens within the driver deployment loop. When the voltage measures above a specified percentage of the Driver 36 VLR for 500 milliseconds, the DERM sets the DTC B1023.
Conditions for Setting the DTC
The DTC sets when the voltage at the Driver Side Low terminal B8 measures above a specified percentage of the Driver 36 VLR for 500 milliseconds during the Continuous Monitoring tests and the DTC B1035 is not set.
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
The DTC clears when the voltage at the Driver Side Low terminal B8 measures within a specified percentage of the Driver 36 VLR for 500 milliseconds during the Continuous Monitoring tests.
Diagnostic Aids
The following situations may cause an intermittent condition:
| • | Backed out/shorted terminals on the inflatable restraint arming sensor harness connector or the inflatable restraint arming sensor jumper harness electrical connector |
| • | Poor connection at any of the inflatable restraint discriminating sensor terminals |
| • | A short from the CKT 236 to the CKT 347 or the CKT 348 |
| • | A short from the CKT 347 to the CKT 1400 |
| • | An open or high resistance in the CKT 348 |
Test Description
Refer to step numbers on the diagnostic table.
-
Start at the SIR Diagnostic System Check for all diagnosis.
-
This test determines whether the malfunction is due to a component or the wiring.
-
This test checks for a short from the Driver 36 VLR circuit to the Driver Side Low circuit.
-
This test checks for a short from the Driver 36 VLR circuit to the Driver Side High circuit.
-
This test determines where the short from Driver 36 VLR circuit to the Driver Side High circuit is located.
-
This test checks for an open between the driver inflatable restraint steering wheel inflator module and the inflatable restraint discriminating sensor network.
-
This test determines where the open is located in circuit 348.
-
This test checks for an open in the LH forward inflatable restraint discriminating sensor between terminal A and B.
-
This test checks for a short inside the inflatable restraint arming sensor.
-
This test checks for a short Driver Side High circuit to the Driver Source Sense circuit.
-
This test determines where the short from Driver Side High circuit to the Driver Source Sense circuit is located.
-
This test checks for a partial short inside the inflatable restraint arming sensor.
-
This test checks for increased resistance of the inflatable restraint discriminating sensor intermediate harness and/or the LH forward inflatable restraint discriminating sensor.
-
This checks for increased resistance of the LH forward inflatable restraint discriminating sensor.
-
This test checks for increased resistance of the inflatable restraint discriminating sensor intermediate harness and/or the RH forward inflatable restraint discriminating sensor.
-
This test checks for increased resistance of the RH forward inflatable restraint discriminating sensor.
When measurements are requested in this table, 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? | -- | |||
Is the displayed voltage more than the value specified? | 30 V | |||
Does J 39200 display OL (infinite)? | -- | |||
4 | Repair the short from circuit 236 to circuit 348 or circuit 349. Has the short from circuit 236 to circuit 348 or 349 been repaired? | -- | -- | |
Measure the resistance on the DERM electrical harness connector from terminal A4 to terminal B9. Does J 39200 display OL (infinite)? | -- | |||
Does J 39200 display OL (infinite)? | -- | |||
7 | Repair the short from circuit 236 to circuit 347 between C110 and the inflatable restraint arming sensor. Has the short from circuit 236 to circuit 347 been repaired? | -- | -- | |
8 | Repair the short from circuit 236 to circuit 347 between C110 and the DERM. Has the short from circuit 236 to circuit 347 been repaired? | -- | -- | |
9 |
Is the connector damaged or corroded? | -- | ||
10 | Check for proper connection on the LH forward inflatable restraint discriminating sensor electrical harness connector terminal B. Are the LH forward inflatable restraint discriminating sensor terminals damaged or corroded? | -- | ||
11 | Replace the LH forward inflatable restraint discriminating sensor electrical harness connector. Has the connector been replaced? | -- | -- | |
12 | Check for proper connection on the LH forward inflatable restraint discriminating sensor electrical harness connector terminals. Are the LH forward inflatable restraint discriminating sensor terminals damaged or corroded? | -- | ||
Measure the resistance from the harness side of the yellow 2-way electrical connector at the base of the steering column terminal B to the LH forward inflatable restraint discriminating sensor electrical harness electrical connector terminal A. Is the resistance less than the specified value? | 5 ohms | |||
14 |
Is the connector damaged or corroded? | -- | ||
15 | Repair the inflatable restraint discriminating sensor intermediate harness electrical connector C109. Has the connector been repaired? | -- | -- | |
Measure the resistance of circuit 348 from the harness side of the yellow 2-way electrical connector at the base of the steering column terminal B to the inflatable restraint discriminating sensor intermediate harness electrical connector C109 terminal A. Is the resistance less than the value specified? | 5 ohms | |||
17 | Repair the open in circuit 348 between C109 and the LH forward inflatable restraint discriminating sensor. Has the open circuit been repaired? | -- | -- | |
18 | Repair the open in circuit 348 between C109 and the yellow 2-way electrical connector at the base of the steering column. Has the open circuit been repaired? | -- | -- | |
Measure the resistance on the LH forward inflatable restraint discriminating sensor from terminal A to terminal B. Is the resistance less than the value specified? | 5 ohms | |||
Measure the resistance on the inflatable restraint arming sensor from terminal C to terminal D. Is the resistance less than the value specified? | 7.5 kohms | Go to Integrity Check | ||
21 |
Is the inflatable restraint arming sensor electrical harness connector damaged or shorted? | -- | ||
22 | Replace the inflatable restraint arming sensor electrical harness connector. Has the connector been replaced? | -- | -- | |
Measure the resistance on the inflatable restraint arming sensor electrical harness connector from terminal C to terminal D. Does J 39200 display OL (infinite)? | -- | |||
24 |
Is the connector damaged or shorted? | -- | ||
25 | Repair the inflatable restraint arming sensor jumper harness connector C110. Has the connector been repaired? | -- | -- | |
Measure the resistance on the inflatable restraint arming sensor jumper harness connector (bulkhead side) from terminal C to terminal D. Does J 39200 display OL (infinite)? | -- | |||
27 | Repair the short from circuit 347 to circuit 1400 in the SIR wiring harness. Has the short circuit been repaired? | -- | -- | |
28 | Repair the short from circuit 347 to circuit 1400 in the inflatable restraint arming sensor jumper harness. Has the short from circuit 347 to circuit 1400 been repaired? | -- | -- | |
Measure the resistance on the inflatable restraint arming sensor from terminal C to terminal D. Is the resistance less than the specified value? | 7.5 kohms | |||
30 |
Is the connector damaged or corroded? | -- | ||
31 | Repair the inflatable restraint discriminating sensor intermediate electrical harness connector C109. Has the connector been repaired? | -- | -- | |
Measure the resistance at the inflatable restraint discriminating sensor intermediate harness electrical connector (engine harness side) from terminal A to terminal B. Is the resistance more than the value specified? | 8.54 kohms | |||
33 |
Is the connector damaged or corroded? | -- | ||
34 | Repair the LH forward inflatable restraint discriminating sensor electrical harness connector. Refer to Wiring Repairs in the Wiring System section. Has the connector been repaired? | -- | -- | |
35 | Check for proper connection on the LH forward inflatable restraint discriminating sensor connector terminals A, B and C. Is the connector damaged or corroded? | -- | ||
36 | Check for proper connection on the LH forward inflatable restraint discriminating sensor connector terminals A, B and C. Is the connector damaged or corroded? | -- | ||
Measure the resistance on the LH forward inflatable restraint discriminating sensor from terminal A to terminal C. Is the resistance more than the value specified? | 8.54 kohms | |||
Is the resistance more than the value specified? | 8.54 kohms | Go to Integrity Check | ||
39 |
Is the connector damaged or corroded? | -- | ||
40 | Repair the RH forward inflatable restraint discriminating sensor electrical harness connector terminal A. Has the connector been repaired? | -- | -- | |
41 | Check for proper connection on the RH forward inflatable restraint discriminating sensor connector terminals A and B. Is the connector damaged or corroded? | -- | ||
42 | Check for proper connection on the RH forward inflatable restraint discriminating sensor connector terminals A and B. Is the connector damaged or corroded? | -- | ||
Measure the resistance on the RH forward inflatable restraint discriminating sensor from terminal A to terminal B. Is the resistance more than the specified value? | 8.54 kohms | Go to Integrity Check | ||
44 | Replace the LH forward inflatable restraint discriminating sensor. Refer to Inflatable Restraint Front End Discriminating Sensor . Has the sensor been replaced? | -- | -- | |
45 | Replace the RH forward inflatable restraint discriminating sensor. Refer to Inflatable Restraint Front End Discriminating Sensor . Has the sensor been replaced? | -- | -- | |
46 | Replace the inflatable restraint arming sensor. Refer to Inflatable Restraint Arming Sensor . Has the sensor been replaced? | -- | -- | |
47 |
Have all the SIR system components been reconnected and mounted? | -- | -- | |
48 | Clear the SIR Diagnostic Trouble Codes. Have the SIR Diagnostic Trouble Codes been cleared? | -- | -- |
