Pinpoint Test P: The Air Bag Warning Indicator Is Never/Always On

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, and 2005 Ford E450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

P1 CARRY OUT THE INSTRUMENT CLUSTER WARNING LAMPS AND CHIME ACTIVE COMMAND USING THE DIAGNOSTIC TOOL
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
- Select the instrument cluster warning lamps and chime active command. Trigger the all lamps active command on and off. Observe the air bag warning indicator.
- Does the air bag warning indicator illuminate when triggered on and turn off when triggered off?
- Yes : GO to P2.
- No : GO to P3.
P2 CHECK CIRCUIT 608 (BK/YE) FOR AN OPEN
- Deactivate the supplemental restraint system (SRS). For additional information, refer to SUPPLEMENTAL RESTRAINT SYSTEM .
- Key in OFF position.
- Disconnect: Instrument Cluster C220a.
- Disconnect: Restraint Control Module (RCM) C310a.
- Measure the resistance between the instrument cluster C220a-3, circuit 608 (BK/YE), harness side and the RCM C310a-15, circuit 608 (BK/YE), harness side.
  
  Fig 1: Checking Circuit 608 (BK/YE) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : REFER to SUPPLEMENTAL RESTRAINT SYSTEM to continue diagnosis of the restraint control system.
- No : REPAIR the circuit. ACTIVATE the supplemental restraint system (SRS). For additional information, refer to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
P3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
  - Corrosion
  - Pushed-out pins
- Connect all the instrument cluster 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 instrument cluster. REFER to INSTRUMENT CLUSTER . ACTIVATE the supplemental restraint system (SRS). For additional information, refer to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ACTIVATE the supplemental restraint system (SRS). For additional information, refer to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.