B1BBC
B1BBC-OCS NEGATIVE SYSTEM WEIGHT
- When Monitored:
While the CAN bus ignition status is in IGN_RUN, the module checks the sensor input ranges.
- Set Condition:
If the module detects a seat weight sensor input with the total seat weight below -6.5 kg ± 1kg.
Diagnostic Test
1. CHECK FOR ACTIVE OCM DTCs
- ACTIVE INTERNAL DTC
- IGNITION DTC
- BATTERY DTC
- SEAT WEIGHT SENSOR DTC
NOTE: Ensure the battery is fully charged.
Turn the ignition on, then off, and then on again.
With the scan tool, read Occupant Classification Module (OCM) DTCs.
Does the scan tool display any active DTCs listed above?
Yes
- Diagnose and repair the DTCs.
No
- Go To 2
2. ACTIVE OR STORED DTC
With the scan tool, read OCM DTCs.
Does the scan tool display active: B1BBC-OCS NEGATIVE SYSTEM WEIGHT?
Yes
- Go To 3
No
- Go To 5
3. PERFORM OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST
Verify that the passenger seat is empty.
NOTE: Failure to follow the test instructions or aborting the test will cause faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed; verify that the ignition is in run; wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize; only press scan tool buttons when directed to do so; and perform the Occupant Classification Module System Verification Test to completion.
With the scan tool in OCM, select More Options, select System Tests, and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test is complete, proceed as follows.
With the scan tool, read OCM DTCs.
Does the scan tool display active: B1BA8-OCS NOT CALIBRATED DTC?
Yes
- Go To 4
- Perform *OCM SYSTEM VERIFICATION TEST. Occupant Classification Module (OCM) System Verification Test
No
- But Other DTCs Present?
- Diagnose and repair the DTCs.
No
- No Active DTCs Present?
- Perform *OCM SYSTEM VERIFICATION TEST. Occupant Classification Module (OCM) System Verification Test
4. VERIFY SEAT WEIGHT SENSOR TORQUE
WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.
Verify that all of the Seat Weight Sensor mounting screws are tightened to torque specification.
WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.
NOTE: Failure to follow the test instructions or aborting the test will cause faults to set when performing the Occupant Classification Module System Verification Test. To prevent faults due to process errors: verify that all tests steps that led you here were performed as directed; verify that the ignition is in run; wait 30 seconds after changing the seat weight before proceeding to allow the system to stabilize; only press scan tool buttons when directed to do so; and perform the Occupant Classification Module System Verification Test to completion.
With the scan tool in OCM, select More Options, select System Tests, and select Occupant Classification Module System Verification Test. Run the test by following the instructions displayed on the scan tool. When the test is complete, proceed as follows.
With the scan tool, read OCM DTCs.
Does the scan tool display active: B1BA8-OCS NOT CALIBRATED DTC?
Yes
- Perform the *Diagnosis/Checkout Procedure For Seat Weight Sensors. Testing and Inspection
- Perform *OCM SYSTEM VERIFICATION TEST. Occupant Classification Module (OCM) System Verification Test
No
- But Other DTCs Present?
- Diagnose and repair the DTCs.
No
- No Active DTCs Present?
- Perform *OCM SYSTEM VERIFICATION TEST. Occupant Classification Module (OCM) System Verification Test
5. STORED B1BBC-OCS NEGATIVE SYSTEM WEIGHT DTC
With the scan tool, record and erase all DTCs from all Airbag System Modules.
If any ACTIVE codes are present they must be resolved before diagnosing any stored codes.
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 wiring and connectors.
Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
The following additional checks may assist you in identifying a possible intermittent problem.
Reconnect any disconnected components and harness connector.
WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.
With the scan tool monitor active codes as you work through the following steps.
Wiggle the wiring harness and connectors of the related airbag circuit or component.
If only stored codes return continue the test until the problem area has been isolated.
In the previous steps you have attempted to recreate the conditions responsible for setting active DTC in question.
Are any ACTIVE DTC's present?
Yes
- Select appropriate symptom from Symptom List.
No
- No problem found at this time. Perform the Occupant Classification Module System Verification Test. Occupant Classification Module (OCM) System Verification Test
- Erase all codes before returning vehicle to customer.