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B1B7E






B1B7E-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT LOW





For a complete wiring diagram, refer to the Wiring Information.

- 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 less than 3.4 ± 0.6% of the (R701) Seat Weight Sensor 5-volt circuit voltage. This DTC will also set if the (R701) Seat Weight Sensor 5-volt circuit is shorted to ground. However, this condition would prevent communication with the Occupant Classification Module (OCM) and cause a Lost Communication With OCM DTC to set in other modules. Also, this DTC will remain active after the condition that set this fault is no longer present. This condition is referred to as latching the DTC for the ignition cycle. Cycling the ignition key 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 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 for a complete list of DTCs.

No

- Go To 2

2. VERIFY THAT DTC B1B7E-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT LOW IS ACTIVE
1. With the scan tool, read the OCM DTCs.

Does the scan tool display active B1B7E-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT LOW DTC?

Yes

- Go To 3

No

- Perform the OCS INTERMITTENT TEST. . OCS Intermittent Test

3. VERIFY THAT DTC B1B7F-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT HIGH AND B1B7E-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT LOW ARE BOTH ACTIVE
1. With the scan tool, read the OCM DTCs.

Does the scan tool display active B1B7F-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT HIGH DTC?

Yes

- Perform the B1B7F-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT HIGH diagnostic test. B1B7F

No

- Go To 4

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 VOLTAGE OF (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT




1. Disconnect the Right-Front Seat Weight Sensor connector.

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.

2. Measure the voltage of the (R701) Seat Weight Sensor 5-volt circuit.

Is the voltage above 4.8 volts?

Yes

- Go To 7

No

- Go To 9

7. CHECK (R718) RT-FT SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND





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 OCM C2 connector.
2. Measure the resistance of the (R718) RT-FT Seat Weight Sensor Signal circuit between the OCM C2 connector cavity 5 and ground.

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 (R718) RT-FT SEAT WEIGHT SENSOR SIGNAL CIRCUIT FOR AN OPEN




1. Measure the resistance of the (R718) RT-FT Seat Weight Sensor Signal circuit between the OCM C2 connector cavity 5 and the Right-Front Seat Weight Sensor connector cavity 2.

Is the resistance below 5.0 Ohms?

Yes

- Replace the Right-Front Seat Weight Sensor.
-Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. . Re-Zero OCM Seat Weight Sensors
- If DTC B1B7E-PASSENGER SEAT WEIGHT SENSOR 2 - RIGHT FRONT INPUT CIRCUIT LOW returns active, Go To 10

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

9. CHECK (R701) SEAT WEIGHT SENSOR 5-VOLT CIRCUIT FOR AN OPEN





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 OCM C2 connector.
2. Measure the resistance of the (R701) Seat Weight Sensor 5-volt circuit between the OCM C2 connector cavity 1 and the Right-Front Seat Weight Sensor connector cavity 3.

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

10. REPLACE THE OCCUPANT CLASSIFICATION MODULE

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.

View repair

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

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