Pinpoint Test J: One Or More Parking, Rear Or License Plate Lamp Is Inoperative

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

J1 DETERMINE THE CONDITION
- Key in OFF position.
- Place the headlamp switch to the parking lamps ON position and observe the parking lamps.
- Are all the parking lamps inoperative?
- Yes : GO to J2.
- No : For the roof marker lamps, GO to at. For all other lamps, GO to J12.
J2 CHECK THE HEADLAMP SWITCH
- Turn the headlamp switch off.
- Disconnect: Headlamp Switch C205.
- Connect a fused (20A) jumper wire between headlamp switch C205 pin B2, circuit 195 (TN/WH), harness side and headlamp switch C205 pin R, circuit 14 (BN), harness side.
  
  Fig 1: Connecting Fused Jumper Wire Between Headlamp Switch Pin B2 & Pin R
  Courtesy of FORD MOTOR CO.
- Do the parking lamps illuminate?
- Yes : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . TEST the system for normal operation.
- No : REMOVE the jumper wire. GO to J3.
J3 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH
- Measure the voltage between headlamp switch C205 pin B2, circuit 195 (TN/WH), harness side and ground.
  
  Fig 2: Measuring Voltage Between Headlamp Switch Pin B2 And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : REPAIR circuit 14 (BN). TEST the system for normal operation.
- No : REPAIR circuit 195 (TN/WH). TEST the system for normal operation.
J4 DETERMINE IF ALL ROOF MARKER LAMPS ARE INOPERATIVE
- Observe the roof marker lamps.
- Are all the roof marker lamps inoperative?
- Yes : TURN the headlamp switch off. GO to J6.
- No : TURN the headlamp switch off. GO to J5.
J5 CHECK THE ROOF MARKER LAMP GROUND CIRCUIT
- Disconnect: Inoperative Roof Marker Lamp.
- Measure the resistance between the inoperative roof marker lamp connector pin 1, circuit 57 (BK), harness side and ground.
  
  Fig 3: Measuring Resistance Between Inoperative Roof Marker Lamp Connector Pin 1 And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : REPAIR circuit 14 (BN). TEST the system for normal operation.
- No : REPAIR circuit 57 (BK). TEST the system for normal operation.
J6 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Disconnect: Inoperative Roof Marker Lamp.
- Measure the resistance between an inoperative roof marker lamp connector pin 1, circuit 57 (BK) and ground.
  
  Fig 4: Measuring Resistance Between An Inoperative Roof Marker Lamp Connector Pin 1 And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to J7.
- No : REPAIR the circuit. TEST the system for normal operation.
J7 CHECK CIRCUIT 14 (BN) FOR AN OPEN (TO ROOF MARKER LAMPS)
- Place the headlamp switch to the parking lamps ON position.
- Measure the voltage between an inoperative roof marker lamp connector pin 3, circuit 14 (BN), harness side and ground.
  
  Fig 5: Measuring Voltage Between Inoperative Roof Marker Lamp Connector Pin 3 And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to J8.
- No : REPAIR the circuit. TEST the system for normal operation.
J8 CHECK THE ROOF MARKER LAMP RELAY
- Turn the headlamp switch off.
- Disconnect: Roof Marker Lamp Relay C1259.
- Carry out the roof marker lamp relay component test. Refer to COMPONENT TESTING for component testing.
- Is the roof marker lamp relay OK?
- Yes : GO to J9.
- No : INSTALL a new roof marker lamp relay. TEST the system for normal operation.
J9 CHECK CIRCUIT 14 (BN) FOR AN OPEN (TO ROOF MARKER LAMP RELAY)
- Place the headlamp switch to the parking lamps ON position.
- Measure the voltage between roof marker lamp relay C1259 pin 2, circuit 14 (BN), harness side and ground.
  
  Fig 6: Measuring Voltage Between Relay Socket Pin And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to J10.
- No : REPAIR the circuit. TEST the system for normal operation.
J10 CHECK CIRCUIT 1109 (OG/BK) FOR AN OPEN
- Measure the voltage between roof marker lamp relay C1259 pin 3, circuit 1109 (OG/BK), harness side and ground.
  
  Fig 7: Checking Relay Power Supply
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to J11.
- No : REPAIR the circuit. TEST the system for normal operation.
J11 CHECK THE ROOF MAKER LAMP RELAY GROUND CIRCUIT
- Measure the resistance between roof marker lamp relay C1259 pin 1, circuit 57 (BK), harness side and ground.
  
  Fig 8: Measuring Resistance Between Roof Marker Lamp Relay Pin 1 And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : REPAIR circuit 14 (BN) to the marker lamps. TEST the system for normal operation.
- No : REPAIR circuit 57 (BK). TEST the system for normal operation.

J12 CHECK THE PARKING LAMP GROUND CIRCUIT

Turn the headlamp switch off.
Disconnect: Inoperative Parking Lamp.

Measure the resistance between the inoperative parking lamp connector and ground as follows:

CONNECTOR CIRCUIT SPECIFICATION

Inoperative Lamp	Connector	Pin	Circuit
RH front lamp	C1043	1	57 (BK)
LH front lamp	C1023	1	57 (BK)
RH rear lamp	C4032	1	57 (BK)
LH rear lamp	C4035	1	57 (BK)
License lamp	C4046	1	57 (BK)

Is the resistance less than 5 ohms?

Yes : REPAIR circuit 14 (BN). TEST the system for normal operation.
No : REPAIR circuit 57 (BK). TEST the system for normal operation.