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





For a complete wiring diagram Refer to Section 8W.


  • 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 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.


Possible Causes
  
PASSENGER SEAT HARNESS IMPROPERLY ROUTED
  
PASSENGER SEAT HARNESS WIRES CHAFED, PIERCED, PINCHED, PARTIALLY BROKEN
  
PASSENGER SEAT HARNESS CONNECTOR TERMINALS BROKEN, BENT PUSHED OUT, SPREAD, CORRODED, CONTAMINATED
  
(R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
  
(R706) RT-RR SEAT WEIGHT SENSOR SIGNAL CIRCUIT SHORTED TO (R701) SEAT WEIGHT SENSOR 5 VOLT CIRCUIT
  
(R728) SEAT WEIGHT SENSOR GROUND CIRCUIT OPEN
  
RIGHT-REAR SEAT WEIGHT SENSOR
  
OCCUPANT CLASSIFICATION MODULE (OCM)
  



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.





Does the scan tool display any active DTCs relating to internal faults, ignition faults, or battery faults?

Yes
  • Diagnose and repair the DTCs. Refer to the Table of Contents in this Section for a complete list of symptoms.


No
  • Go To 2


Diagnostic Test

2.PERFORM THE OCCUPANT CLASSIFICATION MODULE SYSTEM VERIFICATION TEST

NOTE: Ensure that the battery is fully charged.

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



WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.


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.





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

Yes
  • Go To 3


No
  • Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

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

WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two minutes before proceeding.



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.





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

Yes
  • Go To 4


No
  • Go To 9

4.INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS

WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two minutes before proceeding.




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 in accordance with the Service Information.
  • Perform *OCM SYSTEM VERIFICATION TEST.


No
  • Go To 5

5.VERIFY THAT 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 *OCM SYSTEM VERIFICATION TEST.

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






Is the voltage above 0.2 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.

  • Replace the Passenger Seat Harness in accordance with the Service Information.
  • Perform *OCM SYSTEM VERIFICATION TEST.


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




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 in accordance with the Service Information.
  • Perform *OCM SYSTEM VERIFICATION TEST.


No
  • Go To 8

8.CHECK (R728) SEAT WEIGHT SENSOR GROUND CIRCUIT FOR AN OPEN



Is the resistance below 5.0 ohms?

Yes
  • Replace the OCM in accordance with the Service Information.
  • Perform *OCM SYSTEM VERIFICATION TEST.


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 in accordance with the Service Information.
  • Perform *OCM SYSTEM VERIFICATION TEST.

9.CHECKING STORED OR INTERMITTENT CODES

NOTE: Diagnose and repair all active codes before diagnosing stored codes. Refer to the Table of Contents in this Section for a complete list of airbag system diagnostic procedures.



WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait two minutes before proceeding.




WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.


  • 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.



Are any ACTIVE DTCs present?

Yes
  • Select the appropriate diagnostic procedure from the Table of Contents in this section.


No
  • No problem found at this time. Perform the Occupant Classification Module System Verification Test in this Section. Erase all codes before returning vehicle to customer.