B1C27
B1C27-LEFT SIDE SEAT THORAX SQUIB 1 LOW
For a complete wiring diagram consult Diagrams/Electrical.
- When Monitored:
With the ignition on.
- Set Condition:
The Occupant Restraint Controller (ORC) monitors the resistance of the Left Seat Airbag circuits. If low resistance is detected in the Left Seat Airbag circuits the ORC will set this DTC.
Diagnostic Test
1. DETERMINE ACTIVE OR STORED DTC
NOTE: Ensure that the battery is fully charged.
Turn the ignition on.
Select ACTIVE or STORED DTC:
ACTIVE DTC
- Go To 2
STORED DTC
- Go To 5
2. CHECK FOR SHORTED SQUIB CIRCUITS AT THE LEFT SEAT SQUIB AIRBAG
WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.
Disconnect the Left Seat Airbag connector.
WARNING: To avoid serious or fatal injury, do not place an intact undeployed Left Seat Squib Airbag face down on a hard surface, the airbag will propel into the air if accidentally deployed.
NOTE: Check connectors - Clean and repair as necessary.
Connect the 8443 Load Tool and 8443-1 Jumper to the Left Seat Airbag connector.
WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.
With the scan tool, read the active ORC DTC.
Does the scan tool display: B1C27-LEFT SIDE SEAT THORAX SQUIB 1 LOW?
Yes
- Go To 3
No
WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.
- Replace the Left Seat Airbag.
- Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1. Verification Tests
3. CHECK FOR SHORTED LEFT SEAT AIRBAG SQUIB CIRCUITS IN THE SEAT BACK
WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.
Disconnect the Left Seat Airbag C322 connector (under Left Seat).
NOTE: Check connectors - Clean and repair as necessary.
Connect the 8443 Load Tool and 8443-1 Jumper to the C322 connector.
WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.
With the scan tool, read the active ORC DTC.
Does the scan tool display: B1C27-LEFT SIDE SEAT THORAX SQUIB 1 LOW?
Yes
- Go To 4
No
WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.
- Repair or replace the Left Seat Airbag wiring harness (Side Airbag Jumper). Left Seat Airbag circuits shorted to ground between the C322 connector (Side Airbag Jumper) and the Left Seat Airbag connector.
- Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1. Verification Tests
4. CHECK LEFT SEAT SQUIB CIRCUITS FOR A SHORT TO GROUND IN THE BODY HARNESS TO THE SEAT
WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.
Disconnect the 8443 Load Tool and Jumper from the C322 connector.
Disconnect the ORC connectors.
NOTE: Check connectors - Clean and repair as necessary.
Connect the ORC 8443-24 Adaptor to the ORC connectors.
Measure the resistance of the (R5) Left Seat Squib 1 Line 2 circuit between the ORC 8443-24 Adaptor cavity 25 and ground.
Measure the resistance of the (R7) Left Seat Squib 1 Line 2 circuit between the ORC 8443-24 Adaptor cavity 26 and ground.
Is the resistance below 10k ohms on either circuit?
Yes
- Repair or replace the Left Seat Airbag wiring harness. Left Seat Airbag circuits shorted to ground between the C322 connector and the ORC C1 (32 way) connector.
- Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1. Verification Tests
No
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 and serious or fatal injury.
- Replace the ORC.
- Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1. Verification Tests
5. CHECKING STORED OR INTERMITTENT CODES
NOTE: Diagnose and repair all active codes before diagnosing stored codes.
With the scan tool, record and erase all Airbag System Module DTCs.
WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.
Using the wiring diagram/schematic as a guide, inspect the related wiring and connectors for chafed, pierced, pinched, and partially broken wires, and for broken, bent, pushed out, corroded, and contaminated terminals. Repair as necessary.
Reconnect all disconnected components and harness connectors.
WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.
With the scan tool, monitor for active codes while performing the following:
- Wiggle the wiring harness and connectors of the related airbag circuit.
- Continue the test until either a code becomes active or the problem area is isolated.
In the previous steps you have attempted to recreate the conditions responsible for setting the DTC in question/causing the intermittent condition.
Are any ACTIVE DTCs present?
Yes
- Diagnose and repair the DTC(s).
No
- No problem found at this time. Erase all codes before returning the vehicle to the customer.