B1CDC Passenger Occupant Detector Circuit High

B1CDC code - The ORC module cannot recognize between the different faults so it will set a high code. The diagnosis is to check the ODS signal and return circuits for all faults (short to voltage, open, short to ground, and shorted together)

B1CDC code


The Occupant Detection Sensor (ODS) is a resistive sensor that is located in the front passenger seat. This sensor is only used for passenger seatbelt reminder. The seat sensor assumes a passenger is present when a minimum of 53.5 pounds (20kg) of weight is placed in the seat. The resistance of the sensor decreases, signaling to the ORC module that a passenger is present. The ORC then transmits this information to the instrument cluster over the CAN bus. The passenger is only reminded to buckle up if the passenger seat occupant minimum weight threshold determined by the ODS is surpassed and the seat belt buckle is still not latched. The ODS receives battery voltage and clean ground through dedicated sensor plus and minus circuits from the ORC. The ORC receives, processes, and continuously monitors (monitor rate of 500 ms) the analog signal from the ODS. The ODS component is not repairable, if determined inoperable, it would require to be replaced with a new component.

The ORC detects high voltage on the Passenger Occupant Restraint Detector sensor signal circuit for 2.5 - 5 seconds. The DTC will not latch for the entire ignition cycle. The code goes from active to stored 2.5 - 5 seconds after the code setting criteria is gone. This code also covers the open fault.

Possible causes B1CDC code:
- Passenger Occupant Restraint detector signal circuit open
- Passenger Occupant Restraint detector signal circuit shorted to voltage
- Passenger seat occupant detector signal circuit shorted to ground
- Passenger occupant detector return circuit open
- Passenger seat occupant detector signal circuit shorted to the passenger seat occupant detector return circuit
- Passenger seat occupant detector sensor
- Occupant restraint controller (ORC)

Diagnostic test B1CDC code

Step 1. Verify active DTC

The seat belt warning lamp in the instrument cluster does not set to indicate a passenger seat belt reminder feature.
The use of approved special tool or digital multimeter such as a fluke meter that will not apply more than 20 miliamperes to a circuit are the only measurement tools to be used. Make sure the battery is fully  charged.
Turn the ignition on, with the scan tool read the ORC DTCs.
Diagnosing for the high code but also will be checking for an open fault in bots the signal and return circuits.

Does the scan tool display active B1CDC code?

Yes, go to step 2.
No, perform the Airbag System Intermittent Test

Step 2. Check the passenger occupant detector signal circuit for a short to voltage

Repair of the wiring is only to be done on the seat body harness side of the connector. If the wiring fault is in the component side the wiring harness routed into the seat cushion a ODS sensor replacement is to be performed.
Turn the ignition off, disconnect the 12volt battery and wait two minutes before proceeding.
Keep the passenger occupant detector sensor harness connector in the seat cushion connected. Keep the inline harness underseat connector connected. Keep the occupant detection sensor (ODS) in the passenger seat cushion connected. Disconnect the ORC harness connectors.
Connect the SRS load tool adapter 8443-32-L or the ORC harness connector. Turn the ignition on, then reconnect the 12volt battery and wait two minutes before proceeding. Measure the voltage of the passenger occupant detector signal circuit at the aproppriate terminal of the SRS load tool adapter.

Is there any voltage present?

Yes, The ODS sensor is to be replaced whenever a short to voltage fault has been found in the ODS harness even after the harness repair has been performed. Turn the ignition off disconnect the 12volt battery and wait two minutes before proceeding. Repair the passenger occupant detector signal circuit for a short to voltage. Replaced the ODS sensor.

No, go to step 3.

Step 3. Check the passenger occupant detector signal circuit for a short to voltage between the ORC and the inline underseat harness connector

Turn the ignition off disconnect the 12volt battery and wait two minutes before proceeding. Disconnect the in line underseat harness connector.
Turn the ignition on, then reconnect the 12v battery and wait two minutes before proceeding. Measure the voltage between ground and the passanger occupant detector signal circuit at the appropriate terminal of the srs load tool adapter.

Is the voltage present?

Yes, the ODS sensor is to be replaced whenever a short to voltage fault has been found in the ODS harness even after the harness repair has been performed. Turn the ignition off disconnect the 12v battery and wait two minutes before proceeding.
Repair the short to voltage in the passenger occupant detector signal circuit located between the ORC and the in line underseat jumper harness connector. Replace the ODS sensor, perform the Airbag System Intermittent Test

No, go to step 4.

Step 4. Check the passenger occupant detector sensor signal circuit for a short to voltage in the underseat jumper harness

Turn the ignition off disconnect the 12v battery and wait two minutes before proceeding. Connect the underseat connector. Confirm the connector is seated firmly and the lock tab is fully seated.
Access the passenger occupant detector sensor (ODS) harness connector located at the passenger seat cushion. Disconnect the passenger occupant detector sensor (ODS) harness connector.

Turn the ignition on, then reconnect the 12volt battery and wait two minutes before proceeding. Measure the voltage between ground and the occupant detector signal circuit at the appropriate terminal of the srs harness connector.

Is there any voltage present?

Yes, the ODS sensor is to be replaced whenever a short to voltage fault has been found in the ODS harness even after the harness repair has been performed. Turn the ignition off disconnect the 12 volt battery and wait two minuted before proceeding. Repair the short to voltage in the passenger occupant detector signal circuit located between the underseat in line harness connector and the passenger occupant detector sensor harness connector. Replace the ODS sensor

No, go to step 5.

Step 5. Check the passenger occupant detector sensor signal circuit and passenger occupant detector sensor return circuit for an open or high resistance between the ORC and the underseat harness connector

Turn the ignition off disconnect the 12volt battery and wait two minutes before proceeding. Disconnect the underseat harness connector. Measure the resistance of the occupant detector sensor signal circuit from the underseat harness connector to the appropriate terminal of the SRS harness connector. Measure the resistance of the occupant detector sensor return circuit from the underseat connector to the appropriate terminal of the SRS harness connector.

Is the resistance for either circuit below 1.0 Ohms?

Yes, go to step 6.
No, repair the occupant detector sensor signal circuit or occupant detector sensor return circuit for an open or high resistance

Step 6. Check the passenger occupant detector sensor signal circuit and passenger occupant detector return circuit for an open or high resistance in the seatback jumper harness

Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Inspect terminal pins and verify the passenger under seat jumper connector is fully seated correctly and that the connector locking tab is correctly in place. Access the Passenger Occupant Detector Sensor located in the passenger seat cushion.
Disconnect the Passenger Occupant Detector Sensor. Measure the resistance of the (R283) Passenger Occupant Sensor Signal circuit and (R284) Occupant Detector Sensor Return circuit of the appropriate terminals of the ODS sensor to the appropriate terminals of the SRS harness connector.

Is the resistance for either circuit below 1.0 Ohm?

Yes, go to step 7.
No, repair of the wiring is only to be done on the seat body harness side of the connector. If the wiring fault is in the component side of the wiring harness routed into the seat cushion a ODS sensor replacement is to be performed.

Step 7. Check the passenger occupant detector sensor signal circuit and passenger occupant detector sensor return circuit for an open or high resistance with the ods harness fully connected

Confirm the connector is seated firmly and the lock tab is fully seated. Connect the Occupant Detector Sensor (ODS), verify all in-line connections are secure. Measure the resistance of the Passenger Occupant Detector Signal circuit to the Passenger Occupant Detector Sensor Return circuit at the appropriate terminals of the SRS harness connector.

Is the resistance below 700 Ohms?

Yes, turn the ignition on, then reconnect the 12- volt battery and wait two minutes before proceeding. Turn the ignition Off and wait 15 seconds before turning the ignition On. Wait one minute and read active codes. If the B1CDC-Passenger Occupant Detector circuit High DTC becomes active, replace the ORC module.

No, go to step 8.

Step 8. Check operation of the passenger occupant detector sensor

Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Replace the Passenger Occupant Detector Sensor. Remove any special tools or jumper wires and reconnect all previously disconnected components - except the Battery. Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Connect the scan tool to the Data Link Connector - use the most current software available. Use the scan tool and erase the ORC stored codes. Turn the Ignition Off and wait 15 seconds before turning the Ignition On. Wait one minute and read active codes and if there are none present read the stored codes.

Does the scan tool display active B1CDC-PASSENGER OCCUPANT DETECTOR CIRCUIT HIGH DTC?

Yes, turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Replace the ORC module, perform the Airbag System Intermittent Test

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