Pinpoint Test B: DTC B1360 - Ignition Acc/Run Circuit Open

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

B1 CHECK THE CENTRAL JUNCTION BOX (CJB) FUSES 15 (5A) AND 21 (5A) FOR VOLTAGE
- Key in ACCESSORY position.
- Disconnect: CJB Fuse 15 (5A).
- Disconnect: CJB Fuse 21 (5A).
- Measure the voltage between the CJB fuse cavity 15, input side and ground, and between CJB fuse cavity 21, input side and ground.
  
  Fig 1: Measuring Voltage Between CJB Fuse Cavity 15, Input Side And Ground
  Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
- Yes : GO to B2.
- No : GO to B3.
B2 CHECK CIRCUITS 295 (LB/PK) AND 489 (PK/BK) FOR AN OPEN
- Key in OFF position.
- Disconnect: Instrument Cluster C220a.
- Disconnect: Instrument Cluster C220b.
- Measure the resistance between the instrument cluster C220b-18, circuit 295 (LB/PK), harness side and the CJB fuse cavity 15 output side, circuit 295 (LB/PK), and between the instrument cluster C220a-7, circuit 489 (PK/BK), harness side and CJB fuse cavity 21 output side, circuit 489 (PK/BK).
  
  Fig 2: Checking Circuits 295 And 489 For An Open
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : GO to B6.
- No : REPAIR circuit 295 (LB/PK) or circuit 489 (PK/BK). TEST the system for normal operation.
B3 CHECK CIRCUITS 75 (DG/LG) AND 16 (RD/LG) FOR AN OPEN
- Disconnect: Ignition Switch C250.
- Measure the resistance between the ignition switch C250-6, circuit 75 (DG/LG), harness side and CJB fuse cavity 15 input side, circuit 75 (DG/LG), and between the ignition switch C250-1, circuit 16 (RD/LG), harness side and CJB fuse cavity 21 input side, circuit 16 (RD/LG).
  
  Fig 3: Checking Circuits 75 And 16 For An Open
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : GO to B4.
- No : REPAIR circuit 75 (DG/LG) or circuit 16 (RD/LG). TEST the system for normal operation.
B4 CHECK. THE IGNITION SWITCH
- CARRY OUT the Ignition Switch Component Test. Refer to COMPONENT TESTING .
- Is the ignition switch OK?
- Yes : GO to B5.
- No : INSTALL a new ignition switch. REFER to IGNITION SWITCH . TEST the system for normal operation.
B5 CHECK THE CJB
- Key in OFF position.
- Measure the resistance between the CJB fuse 15 input side and output side cavities, and between the CJB fuse 21 input side and output side cavities.
  
  Fig 4: Measuring Resistance Between CJB Fuse 15 Input Side And Output Side Cavities
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes : GO to B6.
- No : INSTALL a new CJB. TEST the system for normal operation.
B6 CHECK THE IGNITION SWITCH PIPS
- Connect the diagnostic tool.
- Monitor the instrument cluster ignition ACC and RUN PIDs while cycling the ignition switch from the ACC position to the RUN position.
- Do the PIDs indicate the ignition switch position correctly?
- Yes : GO to B7.
- No : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . REPEAT the self-test.
B7 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Key in OFF position.
- Disconnect all the instrument cluster connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the instrument cluster connectors and make sure they are seated 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 . REPEAT the self-test.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.