Pinpoint Test Ab: DTC B1933/B1935 - Air Bag Passenger Circuit Open Fault/Air Bag Passenger Inflator Circuit Resistance Low On Squib Fault

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

AB1 CHECK FOR CONTINUOUS AND ON-DEMAND DTCs
WARNING: Restraint system diagnostic tools are for service only. Tools must be removed prior to operating the vehicle over the road. Failure to remove restraint system diagnostic tools could result in injury and possible violation of vehicle safety standards.

WARNING: Never probe the connectors on the air bag module. Doing so can result in air bag deployment, which can result in personal injury.

WARNING: The safety belt pretensioner is a pyrotechnic device. Always wear safety glasses when repairing an air bag equipped vehicle and when handling a safety belt buckle pretensioner or safety belt retractor pretensioner. Never probe a pretensioner electrical connector. Doing so could result in pretensioner or air bag deployment and could result in personal injury.

NOTE: After diagnosing or repairing an SRS, the restraint system diagnostic tools must be removed before operating the vehicle over the road.

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
- Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
- Enter the following diagnostic mode on the scan tool: Retrieve/Record Continuous DTCs.
- Was DTC B1933 or B1935 retrieved during the on-demand self test?
- 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 AB2.
- No : This is an intermittent fault. The fault condition is not present at this time. GO to AB7.
AB2 CHECK THE PASSENGER AIR BAG MODULE
- Key in OFF position.
- Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Remove passenger air bag module. Refer to PASSENGER AIR BAG MODULE .
- Connect: Restraint System Diagnostic Tool 418-F395 (2 required) to Passenger Air Bag Module C256a and C256b.
- Repower the system. Do not prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
- Was DTC B1933 or B1935 retrieved during the on-demand self test?
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.

For DTC B1935, GO to AB3.

For DTC B1933, GO to AB5.

No : INSTALL a new passenger air bag module. Refer to PASSENGER AIR BAG MODULE . GO to AB8.
AB3 CHECK CIRCUIT 15S-JA31 (GN/WH) AND CIRCUIT 91S-JA31 (BK/WH) FOR LOW RESISTANCE BETWEEN THE RCM AND THE PASSENGER AIR BAG MODULE
- Key in OFF position.
- Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Disconnect: Restraint System Diagnostic Tool From Passenger Air Bag Module C256a.
- Measure the resistance between passenger air bag module C256a pin 1, circuit 15S-JA31 (GN/WH), harness side and passenger air bag module C256a pin 2, circuit 91S-JA31 (BK/WH), harness side.
  
  Fig 1: Checking Circuit 15S-JA31 (GN/WH) And Circuit 91S-JA31 (BK/WH) For Low Resistance Between RCM And Passenger Air Bag Module
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to AB6.
- No : GO to AB4.
AB4 MEASURE THE RESISTANCE BETWEEN RCM CIRCUIT 15S-JA31 (GN/WH) AND CIRCUIT 91S-JA31 (BK/WH)
- Disconnect: RCM C2041a and C2041b.
- Measure the resistance between RCM C2041b pin 1, circuit 15S-JA31 (GN/WH), and pin 2, circuit 91S-JA31 (BK/WH), component side.
  
  Fig 2: Measuring Resistance Between RCM C2041b Pin 1, Circuit 15S-JA31 (GN/WH), And Pin 2, Circuit 91S-JA31 (BK/WH), Component Side
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : REPAIR circuit 15S-JA31 (GN/WH) and circuit 91S-JA31 (BK/WH). GO to AB8.
- No : GO to AB6.
AB5 CHECK CIRCUIT 15S-JA31 (GN/WH) AND CIRCUIT 91S-JA31 (BK/WH) FOR AN OPEN BETWEEN THE RCM AND THE PASSENGER AIR BAG MODULE
- Key in OFF position.
- Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Disconnect: Passenger Air Bag Module Restraint System Diagnostic Tool From Passenger Air Bag Module C256a.
- Disconnect: RCM C2041a and C2041b.
- Measure the resistance between RCM C2041b pin 1, circuit 15S-JA31 (GN/WH), harness side and passenger air bag module C256a pin 1, circuit 15S-JA31 (GN/WH), harness side; and between RCM C2041b pin 2, circuit 91S-JA31 (BK/WH), harness side and passenger air bag module C256a pin 2, circuit 91S-JA31 (BK/WH).
  
  Fig 3: Checking Circuit 15S-JA31 (GN/WH) And Circuit 91S-JA31 (BK/WH) For An Open Between RCM And Passenger Air Bag Module
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 0.5 ohm?
- Yes : GO to AB6.
- No : REPAIR circuit 15S-JA31 (GN/WH) or circuit 91S-JA31 (BK/WH). GO to AB8.
AB6 CONFIRM THE RCM FAULT
NOTE: Make sure all restraint system diagnostic tools, sensor electrical connectors and the RCM electrical connectors are connected before carrying out the on-demand self test. If not, erroneous DTCs will be recorded
- Connect: Restraint System Diagnostic Tool 418-F395 to Passenger Air Bag Module C256a.
- Connect: RCM C2041a and C2041b.
- Repower the system. Do not prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
- Was DTC B1932 or B1934 retrieved during the on-demand self test?
- Yes : INSTALL and CONFIGURE a new RCM. Refer to RESTRAINTS CONTROL MODULE (RCM) . GO to AB8.
- No : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. GO to AB8.
AB7 CHECK FOR AN INTERMITTENT FAULT
- Key in OFF position.
- Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Remove the passenger air bag module. Refer to PASSENGER AIR BAG MODULE .
- Connect: Restraint System Diagnostic Tools 418-F395 (2 required) to Passenger Air Bag Module C256a and C256b.
- Repower the system. Do not prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
- Was DTC B1933 or B1935 retrieved during the on-demand self test?
- 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.
  CHECK for causes of the intermittent fault at or near the driver air bag module connector. REPAIR any intermittent concerns found.
  
  If an intermittent concern was found and repaired, GO to AB8.
  
  If an intermittent concern was not found and repaired, for DTC B1935 GO to AB3.
  
  For DTC B1933, GO to AB4.
- No : CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. GO to AB8.
AB8 CHECK FOR ADDITIONAL DTCs
- Refer to the continuous DTCs recorded during Step AB1.
- Were any continuous DTCs retrieved during Step AB1?
- Yes : Do not clear any DTCs until all DTCs have been resolved. GO to the RESTRAINTS CONTROL MODULE (RCM) DIAGNOSTIC TROUBLE CODE (DTC) for pinpoint test direction.
- No : RECONNECT the system. If previously directed to deactivate the system, REACTIVATE the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEACTIVATION AND REACTIVATION . REPOWER the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING . PROVE OUT the system. CLEAR all DTCs.