B1C27 Jeep OBD Code Diagnostic Procedure

B1C27 Jeep OBD Code

LEFT SIDE SEAT THORAX SQUIB 1 LOW

For a complete wiring diagram Refer to Section 8W.

  • When Monitored:

With the ignition on.

 

  • Set Condition: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
(R31) LEFT SEAT SQUIB LINE 1 CIRCUIT SHORTED TO GROUND
(R33) LEFT SEAT SQUIB LINE 2 CIRCUIT SHORTED TO GROUND
LEFT SEAT SQUIB AIRBAG
OCCUPANT RESTRAINT CONTROLLER (ORC)

Diagnostic Test

1. DETERMINE ACTIVE OR STORED DTC

NOTE:
Ensure that the battery is fully charged.

NOTE:
The scan tool, SRS Airbag Load Tool MRL 8443, and DVOM are required to perform the following test.

Turn the ignition on.

Select ACTIVE or STORED DTC:

ACTIVE DTC

  • Go To  2

STORED DTC

  • Go To 4


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 Squib 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 Squib 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  4

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 Squib Airbag in accordance with the Service Information.
  • Perform *AIRBAG SYSTEM VERIFICATION TEST – VER 1.


3. CHECK (R31) LEFT SEAT SQUIB LINE 1 CIRCUIT OR (R33) LEFT SEAT SQUIB LINE 2 CIRCUIT FOR A SHORT TO GROUND

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 Left Seat Squib Airbag connector.

Disconnect the ORC connectors.

NOTE:
Check connectors – Clean and repair as necessary.

  • Connect the ORC 8443-32-L Adaptor to the ORC connectors.
  • Measure the resistance of the (R31) Left Seat Squib Line 1 circuit between ground and the ORC 8443-32-L Adaptor.
  • Measure the resistance of the (R33) Left Seat Squib Line 2 circuit between ground and the ORC 8443-32-L Adaptor.

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.

 

  • Perform *AIRBAG SYSTEM VERIFICATION TEST – VER 1.

 

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 in accordance with Service Information.
  • Perform *AIRBAG SYSTEM VERIFICATION TEST – VER 1.


4. CHECKING STORED OR INTERMITTENT CODES

NOTE:
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 Airbag System Module DTC.

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 DTC present?

Yes

  • Select the appropriate diagnostic procedure from the Table of Contents in this section.

No

  • No problem found at this time. Erase all codes before returning the vehicle to the customer.
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