B1C29
B1C29-LEFT SIDE SEAT THORAX SQUIB 1 OPEN
Special Tools:
For a complete wiring diagram, refer to the wiring information .
Theory of Operation
When powered, the Occupant Restraint Controller (ORC) sends a test current to the squibs to verify the integrity of the squib and wiring. These circuits are maintained in a "floating" configuration at the module (connected to neither power nor ground) as protection against inadvertent deployment. Use of the SRS Load Tool Kit in the tests below substitutes a suspect squib with a known good component. The use of the SRS Load Tool Adapter provides a test point as well as a method for opening the shorting bar connections within the harness connector.
- When Monitored:
The ORC sends out a 40 mA diagnostic current on each squib voltage supply circuit at power up and every 500 ms thereafter while the ignition is in on.
- Set Condition:
This DTC sets when the ORC detects an open on the squib circuit for more than 2.5 seconds. This DTC transitions from active to stored when the module sees a recovery from an open condition for greater than 2.5 seconds.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.
1. DETERMINE ACTIVE OR STORED DTC
NOTE: Make sure the battery is fully charged.
1. Turn the ignition on.
2. With the scan tool, read all active ORC DTCs.
Is the DTC active or stored?
ORC - ACTIVE DTC
- Go To 2
ORC - STORED DTC
- Perform the RESTRAINTS SYSTEM INTERMITTENT TEST. Initial Inspection and Diagnostic Overview.
2. CHECK FOR OPEN SQUIB CIRCUITS IN LEFT SEAT AIRBAG
WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Disconnect the C313 in-line harness connector.
NOTE: Check the connectors - Clean and repair as necessary.
2. Connect the SRS Load Tool Kit to the C313 in-line harness connector.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
3. With the scan tool, read the active ORC DTCs.
Does the scan tool display: B1C29-LEFT SIDE SEAT THORAX SQUIB 1 OPEN?
Yes
- Go To 3
No
- Go To 4
3. CHECK (R7) LEFT SEAT THORAX SQUIB 1 LINE 1 CIRCUIT AND (R5) LEFT SEAT THORAX SQUIB 1 LINE 2 CIRCUIT FOR AN OPEN
WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Disconnect the SRS Load Tool Kit from the C313 in-line harness connector.
2. Disconnect the ORC harness connectors.
NOTE: Check the connectors - Clean and repair as necessary.
3. Connect the SRS Load Tool Adapter to the ORC harness connectors.
4. Measure the resistance of the (R7) Left Seat Thorax Squib 1 Line 1 circuit between the Left Seat Airbag harness connector cavity 4 and the SRS Load Tool Adapter cavity 49.
5. Measure the resistance of the (R5) Left Seat Thorax Squib 1 Line 2 circuit between the Left Side Seat Airbag harness connector cavity 3 and the SRS Load Tool Adapter cavity 50.
Is the resistance below 1.0 Ohm on both circuits?
Yes
- WARNING: If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to take the proper precautions can result in accidental airbag deployment. Failure to follow these instructions may result in possible serious or fatal injury.
- Replace the ORC. Occupant Restraint Controller - Removal.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Initial Inspection and Diagnostic Overview.
No
- WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
- Repair or replace the (R7) Left Seat Thorax Squib 1 Line 1 circuit or (R5) Left Seat Thorax Squib 1 Line 2 circuit for an open.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Initial Inspection and Diagnostic Overview.
4. CHECK FOR OPEN SQUIB CIRCUITS IN LEFT SEAT AIRBAG
WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Disconnect the SRS Load Tool Kit from the C313 in-line harness connector.
2. Reconnect the C313 in-line harness connector.
3. Disconnect the Left Seat Airbag harness connector.
WARNING: Do not place an intact non-deployed airbag face down on a hard surface, the airbag propels into the air if accidentally deployed. Failure to follow these instructions may result in possible serious or fatal injury.
NOTE: Check the connectors - Clean and repair as necessary.
4. Connect the SRS Load Tool Kit and the SRS Load Tool Jumper to the Left Seat Airbag harness connector.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
5. With the scan tool, read the active ORC DTCs.
Does the scan tool display: B1C29-LEFT SIDE SEAT THORAX SQUIB 1 OPEN?
Yes
- WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
- Replace the Seat Airbag Jumper Wire Harness.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Initial Inspection and Diagnostic Overview.
No
- WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
- Replace the Left Seat Airbag. Seat Air Bag - Removal.
- Perform the RESTRAINTS SYSTEM VERIFICATION TEST. Initial Inspection and Diagnostic Overview.