Mountaineer AWD V8-4.6L (2010)
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For Explorer Sport Trac, measure the resistance between the high mounted stoplamp C927-3, circuit CCB08 (VT/WH), harness side and the SJB
C2280a-15, circuit CCB08 (VT/WH), harness side.
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Is the resistance less than 5 ohms?
Yes
GO to I15.
No
REPAIR circuit CCB08 (VT/WH) for an open. TEST the system for normal operation.
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I11 CHECK THE REAR LAMP GROUND CIRCUIT FOR AN OPEN
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Place the headlamp switch in the PARKING LAMPS ON position.
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Does the rear lamp in question illuminate?
Yes
For Mountaineer, TURN the parking lamps off. GO to I12.
For Explorer or Explorer Sport Trac, TURN the parking lamps off. GO to I13.
No
REPAIR the ground circuit in question for an open. CLEAR the DTCs. REPEAT the self-test.
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I12 CHECK FOR VOLTAGE TO THE REAR STOPLAMP
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Disconnect: Inoperative Rear Lamp.
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While applying the brake pedal, measure the voltage between the LH rear lamp (LED module) C419-1, circuit CLS44 (BU/RD), harness side and
ground; or between the RH rear lamp (LED module) C418-1, circuit CLS44 (BU/RD), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
