B1C27 Left Side Seat Thorax Squib 1 Low

B1C27 code - The Occupant Restraint Controller (ORC) monitors the resistance of the left seat squib circuits. The ORC will set this DTC if it detects low resistance of the left seat squib circuits.

Possible causes B1C27 code:
- Left seat squib line 1 circuit shorted to ground
- Left seat squib line 2 circuit shorted to ground
- Left seat squib airbag
- Occupant Restraint Controller (ORC)

Diagnostic test B1C27 code

Step 1.Determine active or stored DTC

Make sure that the battery is fully charged. Turn the ignition on, with the scan tool read the active ORC DTC.

Select active or stored DTC?

Active DTC, go to step 2.
Stored DTC, go to step 4.

Step 2. Check for shorted squib circuits at the left seat squib airbag

Turn the ignition off, disconnect the 12volt battery and wait two minutes before proceeding.
Disconnect the left seat  squib airbag connector. To avoid serious or fatal injury, do not place an intact non deployed left seat squib airbag face down on a hard surface, the airbag will propel into the air if accidentially deployed.

Turn the ignition on, then reconnect the 12volt battery and wait two minutes before proceeding. With the scan tool, read the active ORC DTC.

Does the scan tool display B1C27 code?

Yes, go to step 3.
No, turn the ignition off disconnect the 12volt battery and wait two minutes before proceeding. Replace the left seat squib airbag, perform the Airbag system verification.


Step 3. Check left seat squib line 1 circuit or left seat squib line 2 circuit for a short to ground

Turn the ignition off disconnect the 12 volt battery before proceeding. Disconnect the ORC connectors. Measure the resistance of the left seat squib line 1 circuit between ground and the ORC connector. Measure the resistance of the leaf seat squib line 2 circuit between ground and the ORC connector.

Is the resistance below 10K Ohms on either circuit?

Yes, repair the left seat squib circuits with resistance below 10K Ohms for a short to ground.
No, if the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Replace the ORC, perform the Airbag system verification.

Step 4. Checking Stored or intermittent codes

Diagnose and repair all active codes before diagnosing stored codes. Refer to the table of contents in this section for a complete list of airbag system diagnostic procedures.
With the scan tool, record and erase all DTC. 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.

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 DTC present?

Yes, refer sitemaps-Labels in this site and perform the appropriate diagnostic procedure.
No, no problem found at this time. Erase all codes before returning the vehicle to the customer.

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