B1C28 Left Side Thorax Squib 1 High

B1C28 code - The Occupant Restraint Controller (ORC) monitors the voltage on the left seat squib circuits. The ORC will set this DTC if it detects voltage on the left seat squib circuits.

Possible cause B1C28 code:
- Left seat squib line 1 circuit shorted to battery
- Left seat squib line 2 circuit shorted to battery
- Left seat squib airbag
- Occupant Restraint Controller (ORC)

B1C28
Wiring for DTC B1C28

Diagnostic test B1C28 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, go to step 2.
STORED, go to step 4.

Step 2. Check for shorted squib circuits in left seat squib airbag

Turn the ignition off disconnect the 12volt battery and wait two minutes berfore 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 12 volt battery and wait two minutes before proceeding.
With the scan tool read the active ORC DTC.

Does the scan tool display B1C28 code?

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

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

Turn the ignition off disconnect the 12 volt battery and wait two minutes before preceeding.
Disconnect the ORC connectors. Turn the ignition off disconnect the 12 volt battery and wait two minutes before proceeding.

Measure the voltage of the left seat squib line 1 circuit cavity 1 between the ORC connector and ground.
Measure the voltage of the left seat squib line 2 circuit cavity 2 between the ORC connector and ground.

Is there any voltage present on either circuit?

Yes, repair the left seat squib circuit with voltage present for a short to battery.
No, turn the ignition off disconnect 12 volt battery and wait two minutes before proceeding. If the Occupant Restraint Controller (ORC) is dropped at any time, itt must be replaced. Failure to take the proper precautions can result in accidential airbag deployment. Replace the ORC, perform the Airbag system verification.

Step 4. Checking stored or intermittent codes

Diagnosis and repair all active codes before diagnosing stored codes. With the scan tool, record and erase all Airbag System Module DTC. Turn the ignition off disconnect 12 volt 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 broken, bent, pushed out, corroded, and contaminated terminals. repair as necesary. reconnect all disconnected components and harness connectors.
Turn the ignition on, then reconnect the 12 volt battery and wait two minutes before proceeding. 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 the ACTIVE DTC present?

Yes, refer to SITEMAP/LABELS - DTC B CODES (SRS) and perform the aproppriate diagnostic procedure.
No, no problem found at this time. Erase all codes before returning the vehicle to the customer.

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