Milan FWD L4-2.5L (2010)
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While applying the brake pedal, measure the voltage between the LH rear lamp C419-1, circuit CCB08 (VT/WH), harness side and the LH rear
lamp C419-3, circuit GD171 (BK/GY), harness side; or between the RH rear lamp C418-1, circuit CCB08 (VT/WH), harness side and the RH rear
lamp C418-3, circuit GD171 (BK/GY), harness side.
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Is the voltage greater than 10 volts?
Yes
INSTALL a new rear lamp assembly. REFER to Rear Lamp Assembly See: Backup Lamp/Service and Repair/Rear Lamp Assembly. TEST the system
for normal operation.
No
REPAIR circuit GD171 (BK/GY) for an open. TEST the system for normal operation.
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Pinpoint Test L: The Stoplamps Are On Continuously
Stoplamps
Pinpoint Tests
Pinpoint Test L: The Stoplamps Are On Continuously
Refer to Wiring Diagram Set 90 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Turn Signal/Stop/Hazard Lamps for schematic and connector
information. See: Diagrams/Electrical Diagrams/Diagrams By Number
Normal Operation
When the brake pedal is applied, the stoplamp switch routes voltage to the LH and RH rear stoplamps (Milan and MKZ), the Smart Junction Box (SJB),
the high mounted stoplamp and the PCM.
For Fusion, when the SJB detects the brake pedal is applied, the SJB provides voltage to the LH and RH rear stoplamps.
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DTC B1485 (Brake Pedal Input Short to Battery) - an on-demand DTC that sets when the SJB detects a short to voltage from the stoplamp switch
input circuit.
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DTC B2045 (Left Rear Stop Lamp Circuit Open) - an on-demand DTC that sets when the SJB detects a short to voltage from the LH rear stop/turn
lamp output circuit.
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DTC B2047 (Right Rear Stop Lamp Circuit Open) - an on-demand DTC that sets when the SJB detects a short to voltage from the RH rear
stop/turn lamp output circuit.
This pinpoint test is intended to diagnose the following:
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Wiring, terminals or connectors
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Stoplamp switch
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PCM
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SJB
PINPOINT TEST L: THE STOPLAMPS ARE ON CONTINUOUSLY