Diagnosis And Checkout Procedure For Seat Weight Sensors

To 3.6 Volts for each sensor in each position (full rear, mid track, and full forward).

Is any sensor voltage reading out of the acceptable range in any position?

Yes 

• Go to step  2

No 

• Perform the B1BA7-Occupant Classification System Verification Required. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing .
  NOTE: If the test passes, the seat weight sensing system is working properly. Return to the procedure that directed you to this procedure. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing .

Is any sensor voltage reading out of the acceptable range in any position?

Yes 

• Go to step  3

No 

• Perform the B1BA7-Occupant Classification System Verification Required. Return to the procedure that directed you to this procedure. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing .
  NOTE: If the test passes, the seat weight sensing system is working properly. Return to the procedure that directed you to this procedure. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Diagnosis and Testing .

Is any sensor voltage reading out of the acceptable range?

Yes 

• Go to step  4

No 

• Visually inspect for damaged or bent risers and crossmembers. Also, verify that the riser holes line up with the seat mounts in the crossmembers.
• If riser damage is apparent, replace the risers in accordance with the Service Information.
CAUTION: To avoid seat weight sensor damage, the Strain Gage Alignment Tool 9698A must be used to when loosening or tightening the sensor retainers.
• Then, reinstall the Seat Weight Sensors. Refer to Restraints - Specifications and go to  6.
NOTE: Failure to follow the test instructions or aborting the test causes 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.
• If crossmember or floorpan damage is present, repair or replace the components as necessary in accordance with the Service Information. Reinstall the seat in the vehicle in accordance with the Service Information. Turn the ignition on. With the scan tool in OCM, select More Options, System Tests and select Occupant Classification Module System Verification Test. Run the test by following the directions displayed on the scan tool. When the test completes, go to  1

Is any sensor voltage reading out of the acceptable range?

Yes 

• Go to step  5

No 

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.
• Visually inspect for damaged or bent risers, a damaged or bent seat and seat structure and damaged or bent seat tracks. Also, verify that the holes in the center of the sensors line up with the seat track holes and that the seat track position locating tabs are locked in the same parallel slots.
• If riser damage is apparent, replace the risers in accordance with the Service Information.
CAUTION: To avoid seat weight sensor damage, the Strain Gage Alignment Tool 9698A must be used to when loosening or tightening the sensor retainers.
• Then, reinstall the Seat Weight Sensors. Refer to Restraints - Specifications and go to  6.
• If seat or seat track damage is present, replace the components as necessary in accordance with the Service Information. Refer to Restraints - Specifications . Then, go to  7.

Is any sensor voltage reading out of the acceptable range?

Yes 

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.
CAUTION: To avoid seat weight sensor damage, the Strain Gage Alignment Tool 9698A must be used to when loosening or tightening the sensor retainers.
• Replace any Seat Weight Sensors that have an unacceptable voltage reading in accordance with the Service Information. Refer to Restraints - Specifications . Then, go to  6

No 

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.
CAUTION: To avoid seat weight sensor damage, the Strain Gage Alignment Tool 9698A must be used to when loosening or tightening the sensor retainers.
• Replace the risers in accordance with the Service Information.
• Then, reinstall the Seat Weight Sensors. Refer to Restraints - Specifications and go to  6.

Is any sensor voltage reading out of the acceptable range?

Yes 

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.
CAUTION: To avoid seat weight sensor damage, the Strain Gage Alignment Tool 9698A must be used to when loosening or tightening the sensor retainers.
• Loosen the mounting screws of all Seat Weight Sensors with an unacceptable voltage reading, and repeat Steps 5 and 6.

No 

• Go to step  7

Is any sensor voltage reading out of the acceptable range?

Yes 

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.
CAUTION: To avoid seat weight sensor damage, the Strain Gage Alignment Tool 9698A must be used to when loosening or tightening the sensor retainers.
• Replace the seat track in accordance with the Service Information. Refer to Restraints - Specifications .
• Verify that no binding exists between the seat and risers. Then, repeat Steps 6 and 7.

No 

• Perform the OCS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Occupant Classification (OCM) - Standard Procedure .