Pinpoint Test BO: No Communication With The Restraints Control Module (RCM)

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

BO1 CHECK THE RCM C2041b PIN 19 and 20 FOR DAMAGE
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.
- Key in OFF position.
- Depower the system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in this article.
- Disconnect: RCM C2041a and C2041b.
- Inspect RCM C2041b, harness side and RCM C2041b, component side, pin 19 and 20 for damage.
- Are RCM C2041b and RCM C2041b pin 19 and 20 OK?
Yes : GO to BO2.

No : REPAIR RCM C2041b or RCM C2041b pin 19 and 20 as necessary. RETEST the communication to the RCM. 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.
BO2 CHECK DLC C251 PINS 6 AND 14 FOR DAMAGE
- Inspect DLC C251 and DLC C251 pins 6 and 14 for damage.
  
  Fig 1: Checking DLC C251 Pins 6 And 14 For Damage
  Courtesy of FORD MOTOR CO.
- Are DLC C251 and DLC C251 pins 6 and 14 OK?
Yes : GO to BO3.

No : REPAIR DLC C251 or DLC C251 pins 6 and 14 as necessary. RETEST the communication to the RCM. 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.
BO3 CHECK THE IGNITION CIRCUIT 15-JA10 (GN/OG) FOR AN OPEN
- Key in OFF position.
- Deactivate the system. REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEACTIVATION AND REACTIVATION in this article.
- Key in ON position.
- Measure the voltage between RCM C2041b-24, circuit 15-JA10 (GN/OG), harness side and ground.
  
  Fig 2: Checking Ignition Circuit 15-JA10 (GN/OG) For Open
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to BO4.

No : VERIFY central junction box (CJB) fuse 60 (7.5A) is OK. If OK, REPAIR circuit 15-JA10 (GN/OG). RETEST the communication to the RCM. 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.
BO4 CHECK THE RCM CASE GROUND
- Key in OFF position.
- Measure the resistance between the RCM case and a good sheet metal ground near the RCM.
- Is the resistance less than 25 ohms?
Yes : GO to BO5.

No : REPAIR ground as necessary. RETEST the communication to the RCM. 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.
BO5 CHECK THE HS-CAN CIRCUITS BETWEEN THE RCM AND DLC C251 FOR AN OPEN
- Measure the resistance between RCM C2041b-19, circuit 4-EC18 (GY/BK), harness side and DLC C251-6, circuit 4-EC7 (GY/RD), harness side; and between RCM C2041b-20, circuit 5-EC18 (BU/BK), harness side and DLC C251-14, circuit 5-EC7 (BU/RD), harness side.
  
  Fig 3: Checking HS-CAN Circuits Between RCM And DLC C251 For Open
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 0.5 ohm?
Yes : GO to BO6.

No : REPAIR circuit 4-EC18 (GY/BK), 4-EC7 (GY/RD), 5-EC18 (BU/BK) or circuit 5-EC7 (BU/RD). RETEST the communication to the RCM. 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.
BO6 CONFIRM THE RCM FAULT
NOTE: Make sure the safety belt pretensioner 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.
- Key in OFF position.
- Connect: RCM C2041a and C2041b.
- Enter the following diagnostic mode on the scan tool: On-Demand Self Test.
- Did the diagnostic tool communicate with the RCM?
Yes : Fault corrected. 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.

No : INSTALL and CONFIGURE a new RCM. REFER to RESTRAINTS CONTROL MODULE (RCM) in this article. RETEST the communication to the RCM. 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.