Pinpoint Test C: The Alarm System Does Not Arm/Disarm - Inoperative From The Hood Ajar Switch

C1 CHECK THE RECORDED SJB DTCs
- Make sure the hood is closed.
- Use the recorded results from the SJB self-test.
- Is DTC B1519 retrieved?
- Yes : GO to C2.
- No : GO to C5.
C2 VERIFY THE DTC B1519
- Key in OFF position.
- Disconnect: SJB C2280b.
- Measure the resistance between the SJB C2280b-5, circuit 1304 (VT/OG), harness side and ground.
  
  Fig 1: Measuring Resistance Between SJB C2280B-5 Circuit 1304 (VT/OG)
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to C7.
- No : GO to C3.
C3 CHECK CIRCUIT 1304 (VT/OG) FOR AN OPEN
- Key in OFF position.
- Disconnect: Hood Ajar Switch C127.
- Measure the resistance between the SJB C2280b-5, circuit 1304 (VT/OG), harness side and the hood ajar switch C127-1, circuit 1304 (VT/OG), harness side and ground.
  
  Fig 2: Checking Circuit 1304 (VT/OG) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to C4.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
C4 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Measure the resistance between the hood ajar switch C127-2, circuit 57 (BK), harness side and ground.
  
  Fig 3: Measuring Resistance Between Hood Ajar Switch C127-2 Circuit 57 (BK), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : INSTALL a new hood ajar switch. CLEAR the DTCs. REPEAT the self-test.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
C5 CHECK CIRCUIT 1304 (VT/OG) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Hood Ajar Switch C127.
- Disconnect: SJB C2280b.
- Measure the resistance between the hood ajar switch C127-1, circuit 1304 (VT/OG), harness side and ground.
  
  Fig 4: Measuring Resistance Between Hood Ajar Switch C127-1 Circuit 1304 (VT/OG)
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to C6.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
C6 CHECK THE HOOD AJAR SWITCH
- Make sure the hood is open.
- Connect: Hood Ajar Switch C127.
- Measure the resistance between the SJB C2280b-5, circuit 1304 (VT/OG), harness side and ground.
  
  Fig 5: Measuring Resistance Between SJB C2280B-5 Circuit 1304 (VT/OG)), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to C7.
- No : INSTALL a new hood ajar switch. TEST the system for normal operation.
C7 CHECK THE SJB FOR CORRECT OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the SJB 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 SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . CLEAR the DTCs. REPEAT the self-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.