Notice: Never us an SDM that is damaged or has been subjected to water intrusion. The use of an SDM that is damaged or has been subjected to water intrusion can result in a malfunctioning SIR system and cause vehicle damage.
The Diagnostic System Check - SIR must always be the starting point for any supplemental inflatable restraint (SIR) diagnosis. The Diagnostic System Check -- SIR reveals DTCs through the use of the scan tool. The diagnostic procedures used in this section are designed to find any repair SIR conditions. To get the best results, it is important to use the diagnostic charts and follow the sequence listed below.
- Perform the Diagnostic System Check -- SIR, which reveals DTCs through the use of the scan tool. It also inspects for proper airbag indicator operation.
- Refer to the proper diagnostic chart as directed by the Diagnostic System Check -- SIR. Bypassing these procedures may result in extended diagnostic time, incorrect diagnosis, and incorrect parts replacement.
- Repeat the Diagnostic System Check -- SIR after any repair or diagnostic procedures have been performed to ensure that the repair has been made correctly and that no other malfunction exists.
Circuit Description
When the ignition switch is first turned ON, ignition voltage is supplied from the airbag fuse to the sensing and diagnostic module (SDM) . The SDM responds by flashing the airbag indicator 7 times and then turning it OFF while the SDM performs tests on the SIR.
Diagnostic Aids
The order in which DTCs are diagnosed is very important. Failure to diagnose the DTCs in the order specified may result in extended diagnostic time, incorrect diagnosis, and incorrect parts replacement.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
|
Caution: Refer to Sensing and Diagnostic Module Voltage after Ignition is Turned Off Caution in the Preface section. Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section. | ||||
1 |
Does the warning lamp turn OFF after 4 seconds? | -- | System OK | Go to Step 2 |
2 |
Are there any active fault codes? | -- | Go to Step 3 | |
3 | Inspect fuse F1. Is the fuse F1 open? | -- | Go to Step 4 | Go to Step 5 |
4 | Replace fuse F1. Did you complete the replacement? | -- | System OK | -- |
5 |
Is the wiring harness shorted to ground? | -- | Go to Step 6 | Go to Step 7 |
6 | Repair a short to ground between fuse F1 and terminal 1 of connector C207. Did you complete the repair? | -- | System OK | -- |
7 |
Is the wiring harness shorted to ground? | -- | Go to Step 15 | Go to Step 8 |
8 | Use an ohmmeter to check for continuity between terminal 13 of the DLC and ground G201. Does the ohmmeter show the specified value? | 0 ohms | Go to Step 9 | Go to Step 10 |
9 | Repair the open DLC ground circuit. Did you complete the repair? | -- | System OK | -- |
10 |
Does the voltage measure within the specified range? | 11-14 V | Go to Step 12 | Go to Step 11 |
11 | Repair the power supply for the cigar lighter socket. Did you complete the repair? | -- | System OK | -- |
12 | Inspect for a short to ground or open circuit between terminal 13 of the DLC and terminal 4 of connector 207. Is the wiring harness shorted to ground or open? | -- | Go to Step 13 | Go to Step 14 |
13 | Repair a short to ground or open circuit between terminal 13 of the DLC and terminal 4 of connector C207. Did you complete the repair? | -- | System OK | -- |
14 | Inspect for a short to ground or open between terminal 4 of connector C207 and the SDM connector. Is the wiring harness shorted to ground or open? | -- | Go to Step 15 | Go to Step 16 |
15 | Replace the SDM wiring harness. Did you complete the replacement? | -- | System OK | -- |
16 | Replace the SDM. Did you complete the replacement? | -- | System OK | -- |
