Pinpoint Test O: The Parking, Rear Or License Lamps Are On Continuously

O1 CHECK THE HEADLAMP SWITCH
- Key in OFF position.
- Disconnect: Headlamp Switch C205.
- Do the parking lamps continue to illuminate?
- Yes : GO to O2.
- No : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . TEST the system for normal operation.
O2 CHECK THE POWER SUPPLY CIRCUIT FOR A SHORT TO POWER
- Disconnect: CJB C270e.
- Do all of the parking lamps turn off?
- Yes : GO to O3.
- No : REPAIR the parking lamp power supply circuit. TEST the system for normal operation.
O3 CHECK THE CJB
- Measure the voltage between the CJB fuse 57 and ground.
  
  Fig 1: Measuring Voltage Between CJB Fuse 57 And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes : REPAIR or INSTALL a new CJB. TEST the system for normal operation.
- No : REPAIR circuit 29S-LF1 (OG/YE). TEST the system for normal operation