E 450 V8-5.4L (2009)
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T9 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR (7-PIN) (RH TURN)
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Disconnect: Trailer Tow C4099.
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While applying the brake pedal, measure the voltage between the trailer tow C4099-4, circuit CAT09 (GN), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
INSTALL a new trailer tow connector. TEST the system for normal operation.
No
GO to T10.
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T10 CHECK THE RH TRAILER TOW TURN RELAY
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Disconnect: RH Trailer Tow Stop/Turn Relay.
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Substitute a known good relay.
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For vehicles equipped with a class I trailer tow package, while applying the brake pedal, measure the voltage between the trailer tow C4098-1,
circuit CAT09 (GN), harness side and ground.
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For vehicles equipped with a class II trailer tow package, while applying the brake pedal, measure the voltage between the trailer tow C4099-4,
circuit CAT09 (GN), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
REMOVE the known good relay. INSTALL a new RH trailer tow stop/turn relay. TEST the system for normal operation.
No
REMOVE the known good relay. GO to T11.
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T11 CHECK THE STOPLAMP INPUT CIRCUIT TO THE RH TRAILER TOW STOP/TURN RELAY FOR AN OPEN
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While applying the brake pedal, measure the voltage between the trailer tow RH stop/turn relay pin 1, circuit CLS19 (VT/OG), BJB face side and
