U141B
U141B-IMPLAUSIBLE DATA RECEIVED FROM OCS SENSOR 4 - LEFT REAR
For a complete wiring diagram Consult Diagrams/Electrical.
- When Monitored:
At ignition on the Occupant Classification Module (OCM) supplies 5 volts to power up the Left Rear Passenger Seat Weight Sensor. Every time the sensor is powered up it sends an initialization message containing the sensor serial number to the OCM.
- Set Condition:
If the Left Rear Passenger Seat Weight Sensor 5 volt supply is temporarily interrupted resulting in the sensor powering up more than one time in the same ignition cycle the code will be set.
Diagnostic Test
1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS, AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM)
NOTE: Ensure that 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 relating to internal faults, ignition faults, or battery faults?
Yes
- Diagnose and repair the DTCs.
No
- Go To 2
2. VERIFY THAT DTC U141B-IMPLAUSIBLE DATA RECEIVED FROM OCS SENSOR 4 - LEFT REAR IS ACTIVE
With the scan tool, read OCM DTCs.
Does the scan tool display active: U141B-IMPLAUSIBLE DATA RECEIVED FROM OCS SENSOR 4 - LEFT REAR?
Yes
- Go To 3
No
- Go To 6
3. 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 any of these conditions exist.
- Replace the Passenger Seat Harness.
- Perform *OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST Occupant Classification Module (OCM) System Verification Test.
- Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1 Airbag System Verification Test.
No
- Go To 4
4. PERFORM OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST
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 DTCs?
Yes
- Go To 5
No - But Other DTCs Present
- Diagnose and repair the DTCs.
No - No Active DTCs Present
- Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1 Airbag System Verification Test.
5. VERIFY SEAT 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 torqued to specification. Refer to 23 - BODY/SEATS.
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 DTCs?
Yes
- Perform the Diagnosis/Checkout Procedure For Seat Weight Sensors in this Section.
No - But Other DTCs Present
- Diagnose and repair the DTCs.
No - No Active DTCs Present
- Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1 Airbag System Verification Test.
6. CHECKING STORED OR INTERMITTENT CODES
NOTE: Diagnose and repair all active codes before diagnosing stored codes.
With the scan tool, record and erase all Airbag System Module DTCs.
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 DTCs present?
Yes
- Diagnose and repair the DTC(s).
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.