B1BC8
B1BC8-PASSENGER SEAT WEIGHT SENSORS PERFORMANCE
OCS SEAT WEIGHTS MRL #9077
For a complete wiring diagram Consult Diagrams/Electrical.
- 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 the difference between 2 sensors is less than 3 A/D (15 mV) counts for 10 consecutive minutes while at least one sensor count is changing and greater than 8 A/D (40 mV) counts.
Diagnostic Test
1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM)
NOTE: Ensure the battery is fully charged.
Turn the ignition on, then off, and then on again.
NOTE: This DTC will take 10 minutes to mature, allow plenty of time for the code to mature between as you work through the test steps.
With the scan tool, read Occupant Classification Module (OCM) DTCs.
Does the scan tool display any active DTCs relating to internal faults, ignition faults, or battery faults?
Yes
- Diagnose and repair the DTCs.
No
- Go To 2
2. VERIFY THAT DTC B1BC8-PASSENGER SEAT WEIGHT SENSORS PERFORMANCE IS ACTIVE
With the scan tool, read OCM DTCs.
Does the scan tool display active: B1BC8-PASSENGER SEAT WEIGHT SENSORS PERFORMANCE?
Yes
- Go To 3
No
- Go To 6
3. CHECK FOR OTHER ACTIVE PASSENGER SEAT WEIGHT SENSOR FAULTS IN THE OCM
With the scan tool, read OCM DTCs.
Does the scan tool display any other active Seat Weight Sensor DTCs?
Yes
- Diagnose and repair the DTCs.
No
- Go To 4
4. INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS
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 Passenger Seat Harness wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
Are any of these conditions present?
Yes
NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness.
- Replace the Passenger Seat Harness.
- Perform *OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST.Occupant Classification Module (OCM) System Verification Test
No
- Go To 5
5. PERFORM OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST
Verify that all of the Seat Weight Sensor mounting screws are torqued to specification.
WARNING: To avoid serious or fatal injury, turn the ignition on, then reconnect the battery.
NOTE: Failure to follow 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, wait two minutes, and then proceed as follows.
With the scan tool, read OCM DTCs.
Does the scan tool display any active PASSENGER SEAT WEIGHT SENSOR PERFORMANCE DTCs?
Yes
- Perform the *Diagnosis/Checkout Procedure For Seat Weight Sensors.
- Perform *OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST.Occupant Classification Module (OCM) System Verification Test
- Other DTCs ACTIVE?
Yes
- Diagnose and repair the DTCs.
No
- Perform *OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST.Occupant Classification Module (OCM) System Verification Test
6. TEST FOR INTERMITTENT CONDITION
With the scan tool, record and erase all DTCs from all Airbag 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.
NOTE: This DTC will take 10 minutes to mature, allow plenty of time for the code to mature between as you work through the test steps.
WARNING: To avoid serious or fatal injury, maintain a safe distance from all airbags while performing 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 the active DTC in question.
Does the scan tool display any ACTIVE DTCs?
Yes
- Select appropriate procedure 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.