Circuit Description
When the ignition switch is first turned ON, Ignition 1 voltage is applied from the GAUGES fuse to Redundant Indicator Ignition 1, terminal B2, and to the AIR BAG warning lamp which is connected to SIR Indicator, terminal B1. The AIR BAG fuse applies system voltage to the Ignition 1 inputs, terminals A9 and A10. The inflatable restraint Diagnostic Energy Reserve Module (DERM) Responds by flashing the AIR BAG warning lamp seven times.
When the engine is being cranked, Ignition 1 voltage is applied from the CRANK fuse to the DERM at the Crank input. The DERM responds by grounding the SIR Indicator output until Ignition 1 voltage is removed from the Crank input. This results in the AIR BAG warning lamp being On during cranking.
After cranking, the DERM will flash the AIR BAG warning lamp six times.
Test Description
Refer to step numbers on the diagnostic table.
-
Start at the SIR Diagnostic System Check for all diagnosis.
-
This test determines if the malfunction is due to an open CRANK fuse.
-
This test determines whether the lack of a proper crank signal is due to an open Crank input circuit or an open power feed to the CRANK fuse.
-
This test determines where the open in circuit 806/1035 is located.
-
This test determines if the short-to-ground is open due to a ground in the Crank input circuit.
-
This test determines if the short-to-ground condition is in the wiring harness.
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? | -- | |||
Is the fuse good? | -- | |||
3 |
Is the DERM electrical harness connector damaged or corroded? | -- | ||
4 | Repair the DERM electrical harness connector. Has the connector been repaired? | -- | -- | |
5 | Check for proper connection to the DERM at terminal B10. Are the DERM terminals damaged or corroded? | -- | ||
6 | Check for proper connection to the DERM at terminal B10. Are the DERM terminals damaged or corroded? | -- | ||
7 | Replace the DERM. Refer to Inflatable Restraint Diagnostic Energy Reserve Module . Has the DERM been replaced? | -- | -- | |
8 |
Is the voltage greater than the value specified? | 7.25 V | Go to Integrity Check | |
Is either measurement less than the value specified? | 5 ohms | |||
10 | Repair the open in the power feed to the CRANK fuse. Has the power feed been repaired? | -- | -- | |
11 |
Is the connector damaged or corroded? | -- | ||
12 | Repair the electrical connector C203. Has the connector been repaired? | -- | -- | |
Measure the resistance of circuit 806/1035 at the DERM electrical harness connector from terminal B10 to electrical connector C203 terminal A8. The resistance less than the value specified? | 5 ohms | |||
14 | Repair the open in circuit 806/1035 between the connector C203 and the CRANK fuse. Has the open circuit been repaired? | -- | -- | |
15 | Repair the short in circuit 806/1035 between the DERM terminal B10 and the connector C203. Has the open circuit been repaired? | -- | -- | |
Is the fuse good? | -- | |||
Is the fuse good? | -- | Go to Integrity Check | ||
18 | Repair the short from circuit 806/1035 to ground. Has the short circuit been repaired? | -- | -- | |
19 |
Have all the SIR components been reconnected and properly mounted? | -- | -- | |
20 | Clear the SIR Diagnostic Trouble Codes. Have the SIR Diagnostic Trouble Codes been cleared? | -- | -- |
