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B1B89






B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH







- When Monitored:
While the CAN bus ignition status is in IGN_RUN, the Occupant Classification Module (OCM) checks the sensor input ranges.

- Set Condition:
If the OCM detects that the sensor input is greater than 96 ± 0.6% of the (R701) Seat Weight Sensor 5-volt circuit voltage. Note that this DTC will remain active after the condition that set this fault is no longer present. Performing the Occupant Classification Module System Verification Test will change the status from active to stored if the condition that set the fault is no longer present.





1. CHECK FOR ACTIVE INTERNAL FAULTS, IGNITION FAULTS AND BATTERY FAULTS IN THE OCCUPANT CLASSIFICATION MODULE (OCM)

NOTE: Make sure that the battery is fully charged.

1. Turn the ignition on, then off and then on again.
2. With the scan tool, read the 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 DTC. Testing and Inspection

No

- Go To 2

2. PERFORM THE OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST

NOTE: Make sure that the battery is fully charged.

NOTE: The Occupant Classification Seat Weights 9077 are required to perform this test.

1. Remove any special tools or jumper wires and reconnect all previously disconnected components - except the battery.

WARNING: Turn the ignition on, then reconnect the 12-volt battery. 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 OCS 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, wait two minutes and then proceed as follows.
3. With the scan tool, read the OCM DTCs.

Does the scan tool display any active PASSENGER SEAT WEIGHT SENSOR DTCs?

Yes

- Go To 3

No

- Perform the OCS VERIFICATION TEST. OCS Verification Test.

3. VERIFY THAT DTC B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH IS ACTIVE

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 tightened to specification. [1][2]Restraints and Safety Systems.

WARNING: Turn the ignition on, then reconnect the 12-volt battery. 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 OCS 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, wait two minutes and then proceed as follows.
3. With the scan tool, read steamy DTCs.

Does the scan tool display active B1B89-PASSENGER SEAT WEIGHT SENSOR 1 - RIGHT REAR INPUT CIRCUIT HIGH DTC?

Yes

- Go To 4

No

- Perform the OCS VERIFICATION TEST. OCS Verification Test.

4. INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS

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. Using the wiring diagram / schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chaffed, 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 the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. Re-Zero OCM Seat Weight Sensors.

No

- Go To 5

5. VERIFY THAT PASSENGER SEAT HARNESS IS ROUTED CORRECTLY
1. Verify that the Passenger Seat Harness is routed correctly.

Is the Passenger Seat Harness routed correctly?

Yes

- Go To 6

No

- Reroute the Passenger Seat Harness as necessary.
- Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. Re-Zero OCM Seat Weight Sensors.

6. CHECK (R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE




1. Disconnect the OCM C2 connectors.

WARNING: Turn the ignition on, then reconnect the 12-volt battery. Failure to follow these instructions may result in possible serious or fatal injury.

2. Measure the voltage of the (R706) RT-RR Seat Weight Sensor Signal circuit.

Is the voltage above 0.2 of a volt?

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.

- 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.

- Replace the Passenger Seat Harness.
- Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. Re-Zero OCM Seat Weight Sensors.

No

- Go To 7

7. CHECK (R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT

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. Disconnect the Right-Rear Seat Weight Sensor connector.
2. Measure the resistance between the (R706) RT-RR Seat Weight Sensor Signal circuit and the (R701) Seat Weight Sensor 5-volt circuit.

Is the resistance below 5.0 Ohms?

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 the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. Re-Zero OCM Seat Weight Sensors.

No

- Go To 8

8. CHECK (R728) SEAT WEIGHT SENSOR GROUND CIRCUIT FOR AN OPEN
1. Measure the resistance of the (R728) Seat Weight Sensor Ground circuit between the OCM C2 connector and the Right-Rear Seat Weight Sensor connector.

Is the resistance below 5.0 Ohms?

Yes

- WARNING: If the Occupant Classification Module (OCM) is dropped at any time, it must be replaced. Failure to take the proper precautions could result in accidental airbag deployment and may result in possible serious or fatal injury.

- Replace the OCM.
- Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. Re-Zero OCM Seat Weight Sensors.

No

- 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 the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. Re-Zero OCM Seat Weight Sensors.

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