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

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

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

G1 CHECK THE RCM C310b FOR DAMAGE
- Key in OFF position.
- Depower the air bag system. Refer to DEPOWERING PROCEDURE .
- Disconnect: RCM C310b.
- Inspect the RCM C301b for damage.
- Is the RCM C310b OK?
Yes: GO to G2.

No: REPAIR the RCM C310b as necessary. CONNECT the RCM C310b. REPOWER the air bag system. REFER to REPOWERING PROCEDURE . CARRY OUT the data link diagnostics test.
G2 CHECK THE HIGH SPEED CAN CIRCUITS BETWEEN THE DLC AND THE RCM FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the RCM C310b-31, circuit 1908 (WH), harness side and the DLC C251-6, circuit 1908 (WH), harness side; and between the RCM C310b-32, circuit 1909 (BK), harness side and the DLC C251-14, circuit 1909 (BK), harness side.
  
  Fig 1: Checking High Speed CAN Circuits Between DLC & RCM For Open
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
Yes: GO to G3.

No: REPAIR the circuit in question. CONNECT the RCM C310b. REPOWER the air bag system. REFER to REPOWERING PROCEDURE . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
G3 CHECK FOR CORRECT RCM OPERATION
- Disconnect all the RCM connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the RCM module 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 and REPOWER the air bag system. REFER to REPOWERING PROCEDURE . CLEAR the 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. REPOWER the air bag system. REFER to REPOWERING PROCEDURE . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.