Pinpoint Test Q: One Or More Parking, Rear or License Plate Lamps Is Inoperative
Parking, Rear and License Plate Lamps
Pinpoint Test Q: One Or More Parking, Rear or License Plate Lamps Is Inoperative
Refer to Wiring Diagram Set 92, Parking, Rear and License Lamps for schematic and connector information. [1][2]Diagrams By Number
Normal Operation
When the headlamp switch is placed in the PARKING LAMPS ON position, the Smart Junction Box (SJB) provides a ground for the parking lamp relay coil (integrated into the SJB (Smart Junction Box)). When the parking lamp relay is energized, voltage is routed to the front and rear parking lamps.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Bulb holder
- Rear lamp assembly
- SJB (Smart Junction Box)
PINPOINT TEST Q : ONE OR MORE PARKING, REAR OR LICENSE PLATE LAMPS IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Q1 DETERMINE IF ALL THE PARKING LAMPS ARE INOPERATIVE
- Ignition OFF.
- Place the headlamp switch in the PARKING LAMPS ON position.
Are all the parking lamps inoperative?
Yes
VERIFY the SJB (Smart Junction Box) fuse 22 (15A) is OK. If OK, GO to Q6. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. [1][2]Diagrams By Number
No
If all the front parking lamps are inoperative, GO to Q2.
If all the rear parking and license plate lamps are inoperative, GO to Q3.
For all others, GO to Q4.
Q2 CHECK THE SJB (Smart Junction Box) PARKING LAMP OUTPUT CIRCUIT FOR AN OPEN (FRONT LAMPS)
- PLACE the headlamp switch in the OFF position.
- Disconnect: SJB (Smart Junction Box) C2280E.
- Connect a fused jumper wire between the SJB (Smart Junction Box) C2280E-1, circuit CDC34 (WH/OG), harness side and the SJB (Smart Junction Box) C2280E-6, circuit CLS30 (VT/WH), harness side.
- Ignition ON.
Do the front parking lamps illuminate?
Yes
REMOVE the jumper wire. GO to Q6.
No
REMOVE the jumper wire. REPAIR circuit CLS30 (VT/WH) for an open. TEST the system for normal operation.
Q3 CHECK THE SJB (Smart Junction Box) PARKING LAMP OUTPUT CIRCUIT FOR AN OPEN (REAR LAMPS)
- PLACE the headlamp switch in the OFF position.
- Disconnect: SJB (Smart Junction Box) C2280D.
- Connect a fused jumper wire between the positive battery terminal and the SJB (Smart Junction Box) C2280D-20, circuit CLS30 (VT/WH), harness side.
Do the rear parking lamps illuminate?
Yes
REMOVE the jumper wire. GO to Q6.
No
REMOVE the jumper wire. REPAIR circuit CLS30 (VT/WH) for an open. TEST the system for normal operation.
Q4 CHECK FOR VOLTAGE TO THE INOPERATIVE LAMP
- PLACE the headlamp switch in the OFF position.
- Disconnect: Inoperative Lamp.
- Place the headlamp switch in the PARKING LAMPS ON position.
- For Fusion, measure the voltage between the inoperative lamp, harness side and ground as follows:
Inoperative Lamp Connector-Pin Circuit LH front C1023-2 CLS30 (VT/WH) RH front C1043-2 CLS30 (VT/WH) LH front side marker C1443-1 CLS30 (VT/WH) RH front side marker C1444-1 CLS30 (VT/WH) LH rear C412-2 CLS30 (VT/WH) RH rear C415-2 CLS30 (VT/WH) LH rear side marker C4328-1 CLS30 (VT/WH) RH rear side marker C4327-1 CLS30 (VT/WH) LH license plate C452-1 CLS30 (VT/WH) RH license plate C462-1 CLS30 (VT/WH)
- For MKZ, measure the voltage between the inoperative lamp, harness side and ground as follows:
Inoperative Lamp Connector-Pin Circuit LH front C1023-2 CLS30 (VT/WH) RH front C1043-2 CLS30 (VT/WH) LH front side marker C1113-1 CLS30 (VT/WH) RH front side marker C1114-1 CLS30 (VT/WH) LH rear C419-2 CLS30 (VT/WH) RH rear C418-2 CLS30 (VT/WH) LH rear (luggage compartment lid) C414-1 CLS30 (VT/WH) RH rear (luggage compartment lid) C417-1 CLS30 (VT/WH) LH license plate C452-1 CLS30 (VT/WH) RH license plate C462-1 CLS30 (VT/WH)
Is the voltage greater than 10 volts?
Yes
GO to Q5.
No
REPAIR circuit CLS30 (VT/WH) for an open. TEST the system for normal operation.
Q5 CHECK FOR VOLTAGE TO THE INOPERATIVE LAMP USING THE CONNECTOR GROUND
- For Fusion, measure the voltage between the inoperative lamp connector, harness side as follows:
Inoperative Lamp Connector-Pin/ Circuit Connector-Pin/ Circuit LH front C1023-2 CLS30 (VT/WH) C1023-1 GD123 (BK/GY) RH front C1043-2 CLS30 (VT/WH) C1043-1 GD121 (BK/YE) LH front side marker C1443-1 CLS30 (VT/WH) C1443-2 GD121 (BK/YE) RH front side marker C1444-1 CLS30 (VT/WH) C1444-2 GD123 (BK/GY) LH rear C412-2 CLS30 (VT/WH) C412-1 GD171 (BK/GY) RH rear C415-2 CLS30 (VT/WH) C415-1 GD171 (BK/GY) LH rear side marker C4328-1 CLS30 (VT/WH) C4328-3 GD171 (BK/GY) RH rear side marker C4327-1 CLS30 (VT/WH) C4327-3 GD171 (BK/GY) LH license plate C452-1 CLS30 (VT/WH) C452-2 GD171 (BK/GY) RH license plate C462-1 CLS30 (VT/WH) C462-2 GD171 (BK/GY)
- For MKZ, measure the voltage between the inoperative lamp connector, harness side as follows:
Inoperative Lamp Connector-Pin/ Circuit Connector-Pin/ Circuit LH front C1023-2 CLS30 (VT/WH) C1023-1 GD123 (BK/GY) RH front C1043-2 CLS30 (VT/WH) C1043-1 GD121 (BK/YE) LH front side marker C1113-1 CLS30 (VT/WH) C1113-2 GD121 (BK/YE) RH front side marker C1114-1 CLS30 (VT/WH) C1114-2 GD123 (BK/GY) LH rear C419-2 CLS30 (VT/WH) C419-3 GD171 (BK/GY) RH rear C418-2 CLS30 (VT/WH) C418-3 GD171 (BK/GY) LH rear (luggage compartment lid) C414-1 CLS30 (VT/WH) C414-3 GD171 (BK/GY) RH rear (luggage compartment lid) C417-1 CLS30 (VT/WH) C417-3 GD171 (BK/GY) LH license plate C452-1 CLS30 (VT/WH) C452-2 GD171 (BK/GY) RH license plate C462-1 CLS30 (VT/WH) C462-2 GD171 (BK/GY)
Is the voltage greater than 10 volts?
Yes
For a Fusion rear lamp, any front or license plate lamp, INSTALL a new bulb holder. TEST the system for normal operation.
For a Fusion rear side marker, or an MKZ rear lamp, INSTALL a new lamp assembly. REFER to Rear Lamp Assembly or Reversing Lamp . TEST the system for normal operation.
No
REPAIR the ground circuit in question for an open. TEST the system for normal operation.
Q6 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION
- Disconnect all the SJB (Smart Junction Box) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB (Smart Junction Box) 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 (Smart Junction Box). 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.