Focus L4-2.0L (2009)
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
NOTE: Make sure the bulb is good before continuing diagnostics.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
-------------------------------------------------
I1 DETERMINE THE INOPERATIVE STOPLAMP
-
Ignition OFF.
-
Apply the brake pedal and observe the stoplamps.
-
Are all the stoplamps inoperative?
Yes
Go To Pinpoint Test h. See: Pinpoint Test H: All The Stoplamps Are Inoperative
No
If the high mounted stoplamp is inoperative, GO to I2.
If both rear lamps are inoperative, VERIFY the SJB fuse 6 (20A) is OK. If OK, GO to I4. If not OK, REFER to the Wiring Diagrams to identify the
possible causes of the circuit short.
If one rear lamp is inoperative, GO to I5.
-------------------------------------------------
I2 CHECK FOR VOLTAGE TO THE HIGH MOUNTED STOPLAMP
-
Disconnect: High Mounted Stoplamp C475.
-
While applying the brake pedal, measure the voltage between the high mounted stoplamp C475-1, circuit CCB08 (VT/WH), harness side and
ground.
-
Is the voltage greater than 10 volts?
Yes
GO to I3.
No
REPAIR circuit CCB08 (VT/WH) for an open. TEST the system for normal operation.
-------------------------------------------------
I3 CHECK FOR VOLTAGE TO THE HIGH MOUNTED STOPLAMP USING THE CONNECTOR GROUND
-
While applying the brake pedal, measure the voltage between the high mounted stoplamp C475-1, circuit CCB08 (VT/WH), harness side and the
high mounted stoplamp C475-2, circuit GD110 (BK/WH), harness side.