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: Be careful when you handle a sensing and diagnostic module (SDM). Do
not strike or jolt the SDM. Before applying power to the SDM:
• Remove any dirt, grease, etc. from the mounting surface • Position the SDM horizontally on the mounting surface • Point the arrow on the SDM toward the front of the vehicle • Tighten all of the SDM fasteners and SDM bracket fasteners to
the specified torque value
These diagnostic procedures will help you to find and repair SRS malfunctions. This service category also contains information for repairing SRS malfunctions. For best results, use the diagnostic tables, and follow the sequence listed below:
• | Proper AIR BAG warning lamp operation |
• | Ability of the SDM to communicate through the Data Link Connector (DLC) |
• | Existence of SRS Diagnostic Trouble Codes (DTC) |
• | Extended Diagnostic Time |
• | Incorrect Diagnosis |
• | Incorrect Parts Replacement |
The ignition switch supplies Ignition 1 voltage to the supplemental restraint Sensing and Diagnostic Module (SDM) at terminal 10 using the SIR Fuse. When the ignition switch is first turned to the RUN position, the SDM responds by flashing the AIR BAG warning lamp seven times, then turning it OFF, 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:
• | Extended Diagnostic Time |
• | Incorrect Diagnosis |
• | Incorrect Parts Replacement |
Refer to step numbers on the diagnostic table.
The supplemental restraint IP module switch must be in the ON position to perform the system diagnostic check.
The AIR BAG warning lamp should flash 7 times after the ignition switch is first turned to the RUN position.
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.
The AIR BAG warning lamp should turn OFF after flashing 7 times.
This test inspects for the proper operation of the serial data line.
This test will identify the stored diagnostic trouble codes (DTC) and whether they are current or history.
This test inspects for the proper operation of the serial data line.
This test refers to the appropriate DTC Table Diagnostic Aids for diagnosis of the history DTCs.
Step | Action | Value(s) | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|---|
1 | Does this vehicle have a supplemental restraint IP module switch? | -- | ||||||||
Is the supplemental restraint IP module switch in the ON position? | -- | -- | ||||||||
Turn the ignition switch to the RUN position. Note the AIR BAG warning lamp. Does the AIR BAG warning lamp flash 7 times? | -- | |||||||||
Does the AIR BAG warning lamp come ON steady? | -- | |||||||||
Note the AIR BAG warning lamp after the AIR BAG warning lamp flashed 7 times. Does the AIR BAG warning lamp turn OFF? | -- | |||||||||
Is a current DTC displayed? | -- | |||||||||
7 | Does the scan tool indicate no data received? | -- | Go to Data Link Connector in Wiring Systems | |||||||
Has current DTC diagnosis been performed and the current DTCs cleared? | -- | -- | ||||||||
9 |
Is a history DTC displayed? | -- | ||||||||
Does the scan tool indicate no data received? | -- | Go to Data Link Connector in Wiring Repairs | System OK | |||||||
Has the diagnosis been performed and the DTCs cleared? | -- | -- |