Pinpoint Test AJ: B1998/B1999 - Passenger Side, Side Mount Air Bag Circuit Open Fault/Passenger Side, Side Mount Air Bag Circuit Low Resistance 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.

AJ1 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 B1998 or B1999 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 AJ2.

No : This is an intermittent fault. The fault condition is not present at this time. GO to AJ6.
AJ2 CHECK THE PASSENGER SIDE AIR BAG MODULE
- Key in OFF position.
- Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in this article.
- Disconnect: Passenger Side Air Bag Module C312e From Passenger Seat C312.
- Connect: Restraint System Diagnostic Tool 501-109 to Passenger Side Air Bag Module C312e.
- Repower the system. Do not prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in this article.
- Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
- Was DTC B1998 or B1999 retrieved during the on-demand self test?
Yes : For DTC B1998, GO to AJ4.

For DTC B1999, GO to AJ3.

No : REMOVE and INSPECT the seat side air bag module harness for damage. If a concern is found, REPAIR the harness as needed. If no problem is found in the harness, INSTALL a new passenger seat side air bag module. REFER to SIDE AIR BAG MODULE in this article. GO to AJ7.
AJ3 CHECK THE PASSENGER SIDE AIR BAG CIRCUIT 91S-JA38 (BK/RD) AND CIRCUIT 15S-JA38 (GN/OG) FOR LOW RESISTANCE
- Key in OFF position.
- Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in this article.
- Disconnect: Passenger Seat C312.
- Measure the resistance between passenger seat C312e-9, circuit 15S-JA38 (GN/OG), harness side and C312e-10, circuit 91S-JA38 (BK/RD), harness side.
  
  Fig 1: Checking Passenger Side Air Bag Circuit 91S-JA38 (BK/RD) And Circuit 15S-JA38 (GN/OG) For Low Resistance
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes : GO to AJ5.

No : REPAIR circuit 91S-JA38 (BK/RD) and circuit 15S-JA38 (GN/OG). GO to AJ7.
AJ4 CHECK CIRCUIT 91S-JA38 (BK/RD) FOR AN OPEN
- Key in OFF position.
- Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in this article.
- Disconnect: Passenger Seat C312.
- Disconnect: RCM C2041a and C2041b.
- Measure the resistance between RCM C2041a-8, circuit 91S-JA38 (BK/RD), harness side and passenger seat C312e-10, circuit 91S-JA38 (BK/RD), harness side; and between RCM C2041a-7, circuit 15S-JA38 (GN/OG), harness side and passenger seat C312e-9, circuit 15S-JA38 (GN/OG), harness side.
  
  Fig 2: Checking Circuit 91S-JA38 (BK/RD) For Open
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 0.5 ohm?
Yes : GO to AJ5.

No : REPAIR circuit 91S-JA38 (BK/RD) or circuit 15S-JA38 (GN/OG). GO to AJ7.
AJ5 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: Passenger Seat C312.
- Connect: Restraint System Diagnostic Tool 501-109 to Passenger Side Air Bag Module C312e.
- 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 in this article.
- Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
- Was DTC B1998 or B1999 retrieved during the on-demand self test?
Yes : INSTALL and CONFIGURE a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM) in this article. GO to AJ7.

No : CHECK for causes of the intermittent fault on the pretensioner circuits. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. GO to AJ7.
AJ6 CHECK FOR AN INTERMITTENT FAULT
- Key in OFF position.
- Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in this article.
- Disconnect: Passenger Side Air Bag Module C312e From Passenger Seat C312.
- Connect: Restraint System Diagnostic Tool 501-109 to Passenger Seat C312e.
- Repower the system. Do not prove out the system at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in this article.
- Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
- Was DTC B1998 or B1999 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 passenger side air bag module electrical connector. REPAIR any intermittent concern found.

If an intermittent concern was found and repaired, GO to AJ7.

If an intermittent concern was not found and repaired, GO to AJ3.

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 AJ7.
AJ7 CHECK FOR ADDITIONAL DTCs
- Refer to the continuous DTCs recorded during Step AJ1.
- Were any continuous DTCs retrieved during Step AJ1?
Yes : Do not clear any DTCs until all DTCs have been resolved. GO to the DIAGNOSTIC TROUBLE CODES (DTCS) in this article 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 in this article. REPOWER the system. REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in this article. PROVE OUT the system. CLEAR all DTCs.