Focus L4-2.0L (2009)
Brake Lamp: Pinpoint Tests
Pinpoint Test H: All The Stoplamps Are Inoperative
Stoplamps
Pinpoint Tests
Pinpoint Test H: All The Stoplamps Are Inoperative
Refer to Wiring Diagram Set 90, Turn Signal/Stop/Hazard Lamps for schematic and connector information. See: Diagrams/Electrical
Diagrams/Diagrams By Number
Normal Operation
The stoplamp switch is supplied voltage through circuit SBP02 (YE/RD) from the Smart Junction Box (SJB). When the brake pedal is applied, the
stoplamp switch routes voltage back to the SJB and the high mounted stoplamp through circuit CCB08 (VT/WH). The SJB provides voltage to the rear
lamps when it receives input from the stoplamp switch indicating that the brake pedal is applied. Ground is shared by all the stoplamps through circuit
GD110 (BK/WH).
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors
-
Stoplamp switch
-
SJB
PINPOINT TEST H: ALL THE STOPLAMPS ARE INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
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H1 CHECK FOR VOLTAGE TO THE STOPLAMP SWITCH
-
Ignition OFF.
-
Disconnect: Stoplamp Switch C278.
-
Measure the voltage between the stoplamp switch C278-1, circuit SBP02 (YE/RD), harness side and ground.
-
Is the voltage greater than 10 volts?
Yes
GO to H3.
No
VERIFY the SJB fuse 2 (15A) is OK. If OK, GO to H2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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H2 CHECK STOPLAMP SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
-
Disconnect: SJB C2280d.
-
Measure the resistance between the stoplamp switch C278-1, circuit SBP02 (YE/RD), harness side and the SJBC2280d-13, circuit SBP02
(YE/RD), harness side.
