B1BBC
B1BBC-OCS NEGATIVE SYSTEM WEIGHT
OCS SEAT WEIGHTS MRL #9077
- 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.
1. CHECK FOR ACTIVE OCM DTCs
- ACTIVE INTERNAL DTC
- IGNITION DTC
- BATTERY DTC
- SEAT WEIGHT SENSOR DTC
NOTE: Make sure the battery is fully charged.
1. Turn the ignition on, then off, and then on again.
2. 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. Occupant Classification Module (OCM) System Verification Test.
No
- Go To 2
2. ACTIVE OR STORED DTC
1. 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
1. 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 Occupant Classification Module (OCM) System Verification Test.
2. 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.
3. With the scan tool, read OCM DTCs.
Does the scan tool display active: B1BA8-OCS NOT CALIBRATED DTC?
Yes
- Go To 4
- Perform the OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST. Occupant Classification Module (OCM) System Verification Test.
No - But Other DTCs Present
- Diagnose and repair the DTCs. Testing and Inspection.
No - No Active DTCs Present
- Perform the OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST. Occupant Classification Module (OCM) System Verification Test.
4. VERIFY SEAT WEIGHT SENSOR TORQUE
WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Verify that all of the Seat Weight Sensor mounting screws are torqued to specification. [1][2]Mechanical Specifications.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
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 Occupant Classification Module (OCM) System Verification Test.
2. 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.
3. 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. Diagnosis and Checkout Procedure For Seat Weight Sensors.
- Perform the OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST. Occupant Classification Module (OCM) System Verification Test.
No - But Other DTCs Present
- Diagnose and repair the DTCs. Testing and Inspection.
No - No Other DTCs Present
- Perform the OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST. Occupant Classification Module (OCM) System Verification Test.
5. STORED B1BBC-OCS NEGATIVE SYSTEM WEIGHT DTC
1. With the scan tool, record and erase all DTCs from all Airbag System Modules.
2. If any ACTIVE codes are present they must be resolved before diagnosing any stored codes.
WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
3. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
4. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
5. The following additional checks may assist you in identifying a possible intermittent problem.
6. Reconnect any disconnected components and harness connector.
WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
7. With the scan tool monitor active codes as you work through the following steps.
WARNING: Maintain a safe distance from all airbags while performing the following steps. Failure to follow these instructions may result in possible serious or fatal injury.
8. Wiggle the wiring harness and connectors of the related airbag circuit or component.
9. If only stored codes return continue the test until the problem area has been isolated.
10. In the previous steps you have attempted to recreate the conditions responsible for setting active DTC in question.
Are any ACTIVE DTCs present?
Yes
- Select appropriate diagnostic. Testing and Inspection.
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.