Transit Connect L4-2.0L (2010)
Normal Operation
When the headlamp switch is placed in the HEADLAMPS ON position and the fog lamp switch is engaged, the headlamp switch provides voltage to the
rear fog lamps. Voltage is also routed to the Generic Electronic Module (GEM) to indicate the rear fog lamps are on (rear fog lamps on indicator).
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DTC B2509 (Rear Fog Lamp Switch Circuit Failure) - an on-demand DTC that sets when the GEM detects a short to voltage from the fog lamps
voltage supply circuit.
This pinpoint test is intended to diagnose the following:
-
Wiring, terminals or connectors
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Headlamp switch
-
GEM
PINPOINT TEST R: THE REAR FOG LAMPS ARE ON CONTINUOUSLY
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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R1 CHECK THE HEADLAMP SWITCH
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Ignition OFF.
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Disconnect: Headlamp Switch C205.
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Ignition ON.
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Do the rear fog lamps continue to illuminate?
Yes
GO to R2.
No
INSTALL a new headlamp switch. REFER to Headlamp Switch See: Headlamp/Headlamp Switch/Service and Repair. CLEAR the DTCs. REPEAT the
self-test.
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R2 CHECK THE GEM
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Ignition OFF.
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Disconnect: GEM C201b.
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Ignition ON.
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Do the rear fog lamps continue to illuminate?
Yes
REPAIR the rear fog lamps voltage supply circuit for a short to voltage. TEST the system for normal operation.
No
GO to R3.
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R3 CHECK FOR CORRECT GEM OPERATION
-
Ignition OFF.
-
Disconnect all the GEM connectors.
