Caution: In order to avoid deploying the air bag when troubleshooting the SRS system, use only the equipment specified in this manual and the instructions given in this manual. Failure to use the specified equipment as instructed could cause air bag deployment, personal injury to you or someone else, or unnecessary SRS system repairs.

CAUTION: If any water enters the vehicle's interior up to the level of the carpet or higher and soaks the carpet, the sensing and diagnostic module (SDM) and the SDM harness connector may need to be replaced. The SDM could be activated when powered, which could cause deployment of the air bag(s) and result in personal injury. Before attempting these procedures, the SRS system must be disabled. Refer to Disabling the SRS System in this section. With the ignition OFF, inspect the SDM mounting area, including the carpet. If any significant soaking or evidence of significant soaking is detected, you must perform the following steps:

These diagnostic procedures will help you in order to find and repair SRS malfunctions. This service category also contains information for repairing SRS malfunctions. For the best results, use the diagnostic tables and follow the sequence listed below:

1. Perform the SRS Diagnostic System Check. All SRS diagnostics must begin with the SRS Diagnostic System Check. The SRS Diagnostic System Check determines the following results:

•	The proper AIR BAG warning lamp operation

•	The ability of the SDM to communicate through the data link connector (DLC)

•	The existence of SRS diagnostic trouble codes (DTC)

2. Refer to the diagnostic table as directed by the SRS Diagnostic System Check. The diagnostic tables will help enable you to diagnose any SRS malfunction. Do not bypass these procedures. Bypassing these procedures could result in the following conditions:

•	Extended diagnostic time

•	Incorrect diagnosis

•	Incorrect parts replacement

3. Repeat the SRS Diagnostic System Check after you perform any repair or diagnostic procedures. The SRS Diagnostic System Check will verify that you have correctly performed the repair. The SRS Diagnostic System Check will also ensure that no other malfunctions exist.

The ignition switch uses the SRS fuse in order to supply Ignition 1 voltage to the supplemental restraint sensing and diagnostic module (SDM) at terminal 10 using the Air Bag Fuse. When the ignition switch is first turned to the RUN position, the SDM responds by flashing the AIR BAG warning lamp 7  times. Then, the SDM turns the AIR BAG warning lamp to the OFF position while performing tests on the SRS.

You must diagnose the diagnostic trouble codes in the order specified by the SRS Diagnostic System Check. Failure to do so may result in the following conditions:

Refer to step numbers on the diagnostic table.

2. The supplemental restraint IP module switch must be in the ON position to perform the system diagnostic check.

3. The AIR BAG warning lamp should flash 7 times after the ignition switch is first turned to the RUN position.

4. The AIR BAG warning lamp indicates improper operation. This test differentiates a warning lamp stays ON condition from a warning lamp does not come ON condition.

5. The AIR BAG warning lamp should turn OFF after flashing 7 times.

6. This test inspects for the proper operation of the serial data line.

8. This test will identify the stored diagnostic trouble codes and whether they are current or history.

10. This test inspects for the proper operation of the serial data line.

11. This test refers to the appropriate DTC table diagnostic aids for diagnosis of the history DTCs.