Pinpoint Test B: The Restraint Control Module (RCM) Does Not Respond To The Diagnostic Tool

WARNING: This page is about a different car, the 2005 Lincoln Navigator and 2005 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

B1 CHECK THE RCM C310A FOR DAMAGE
- Key in OFF position.
- Depower the supplemental restraint system (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
- Disconnect: RCM C310a.
- Inspect the RCM C310a for damage.
- Is the RCM C310a OK?
- Yes : GO to B2.
- No : REPAIR the RCM C310a. CONNECT the RCM C310a. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CARRY OUT the data link diagnostics test.
- B2 CHECK CIRCUIT 70 (LB/WH) BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE RCM C310A FOR AN OPEN
  - Measure the resistance between the RCM C310a pin 11, circuit 70 (LB/WH), harness side and the DLC C251 pin 7, circuit 70 (LB/WH), harness side.
    
    Fig 1: Checking Circuit 70 (LB/WH) Between Data Link Connector (DLC) C251 And RCM C310A For Open
    Courtesy of FORD MOTOR CO.
  - Is the resistance less than 5 ohms?
  - Yes : GO to B3.
  - No : REPAIR the circuit. CONNECT the RCM C310a. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CARRY OUT the data link diagnostics test.
- B3 CHECK FOR CORRECT RCM OPERATION
  - Depower the supplemental restraint system (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
  - Disconnect all the RCM connectors.
  - Check for:
    - corrosion
    - pushed-out pins
  - Connect all the RCM connectors and make sure they seat correctly.
  - Operate the system and verify the concern is still present.
  - Is the concern still present?
  - Yes : INSTALL a new RCM. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . CLEAR the diagnostic trouble codes (DTCs). REPEAT the self-test. CARRY OUT the data link diagnostics test.
  - No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
  PINPOINT TEST C: THE VEHICLE SECURITY MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL
  1. C1 CHECK THE VEHICLE SECURITY MODULE C2113C FOR DAMAGE
    - Key in OFF position.
    - Disconnect: Vehicle Security Module C2113c.
    - Inspect the vehicle security module C2113c for damage.
    - Is the vehicle security module C2113c OK?
    - Yes : GO to C2.
    - No : REPAIR the vehicle security module C2113c. CARRY OUT the data link diagnostics test.