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

Test Step 

F1 CHECK THE RCM C310b FOR DAMAGE 

• Key in OFF position.
• Deactivate the air bag system, refer to AIR BAG RESTRAINT SYSTEMS .
• Disconnect: RCM C310b.
• Inspect the RCM C310b for damage.
• Is the RCM C301b OK? 

Result / Action to Take 

Yes 

GO to F2.

No 

REPAIR the RCM C310b. CARRY OUT the diagnostic tool data link test.

Test Step 

F2 CHECK CIRCUIT 70 (LB/WH) FOR AN OPEN 

• Key in OFF position.
• Measure the resistance between the DLC C251 pin 7, circuit 70 (LB/WH), harness side and the RCM C310b pin 4, circuit 70 (LB/WH), harness side.
  Fig 1: Checking Circuit 70 (LB/WH) For An Open

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

Result / Action to Take 

Yes 

GO to F3.

No 

REPAIR the circuit in question. CARRY OUT the diagnostic tool data link test.

Test Step 

F3 CHECK FOR CORRECT RCM OPERATION 

• 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? 

Result / Action to Take 

Yes 

INSTALL a new RCM. REFER to AIR BAG RESTRAINT SYSTEMS . CARRY OUT the diagnostic tool data link test.

No 

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.