Pinpoint Test U: Pinpoint Test W: DTC B229B - Occupant Classification System Obstruction

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the safety canopy and cause serious personal injury or death.

WARNING: Never probe the electrical connectors on air bag, safety canopy or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

WARNING: Never probe the electrical connectors on safety belt buckle/retractor pretensioners or adaptive load limiting retractors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors, which increases the risk of serious personal injury or death.

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough Inspection and Verification before proceeding with the pinpoint test.

U1 CHECK FOR CONTINUOUS OR ON-DEMAND DTCs
- Enter the following diagnostic mode on the diagnostic tool: OCSM On-Demand Self Test /Retrieve and Record Continuous Memory DTCs
- Was on-demand DTC B229B retrieved?
1. YES : This is a hard fault. The fault condition is still present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test. Go to U2.
2. NO : This is an intermittent fault when present as a continuous memory DTC only (DTC not retrieved on demand). The fault condition is not present at this time. Go to U4.
U2 INSPECT UNDER THE PASSENGER SEAT FOR FOREIGN OBJECTS AND WIRE HARNESS
- Key in OFF position.
- Position the seat and inspect under and on the sides of the seat for the presence of any foreign objects contacting the under side and side of the passenger seat. Carry out a thorough visual inspection of the passenger seat wire harness at or near the OCS weight sensor bolts and the related seat wiring harness and body wiring harness for correct harness routing.
- Were any problems noted?
1. YES : REMOVE obstruction and/or REPAIR as necessary. Go to U5.
2. NO : Go to U3.
U3 CONFIRM THE OCS MODULE FAULT
- Enter the following diagnostic mode on the diagnostic tool: OCSM On-Demand Self Test /Retrieve and Record Continuous Memory DTCs
- Was on-demand DTC B229B retrieved?
1. YES : INSTALL a new OCSM. REFER to Occupant Classification Module - Manual Seat Track or Occupant Classification Module - Power Seat Track . Go to U5.
2. NO : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and moving/positioning the passenger seat. ACTIVATE other systems in the same wire harness. REPAIR any intermittent concerns found. Go to U5.
U4 CHECK FOR AN INTERMITTENT FAULT
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: OCSM On-Demand Self Test /Retrieve and Record Continuous Memory DTCs
- Was on-demand DTC B229B retrieved?
1. YES : This is a hard fault. The fault condition is now present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self test. Go to U2.
2. NO : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by moving/positioning the passenger seat. REPAIR any intermittent concerns found. Go to U5.
U5 CHECK FOR ADDITIONAL DTCs
- Refer to the OCSM continuous memory DTCs recorded during Step U1.
- Were any continuous memory DTCs retrieved during Step U1?
1. YES : Do not clear any DTCs until all DTCs have been resolved. Go to the Supplemental Restraint System (SRS) Diagnostic Trouble Code (DTC) Chart for pinpoint test direction.
2. NO : RECONNECT the SRS. REPOWER the SRS. REFER to Supplemental Restraint System (SRS) Depowering and Repowering . PROVE OUT the SRS. CLEAR all OCSM and RCM DTCs.