Ranger 4WD V6-4.0L (2009)
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Is the voltage greater than 10 volts?
Yes
GO to G8.
No
REPAIR the circuit. TEST the system for normal operation.
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G8 CHECK THE REAR LAMP GROUND CIRCUIT FOR AN OPEN
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Disconnect: Negative Battery Cable.
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Disconnect: LH Rear Stoplamp C412.
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Measure the resistance between the LH rear lamp C412-1, circuit GD121 (BK/YE), harness side and ground.
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Is the resistance less than 5 ohms?
Yes
INSTALL a new multifunction switch. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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G9 CHECK FOR VOLTAGE TO THE REAR LAMP
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Disconnect: Inoperative Rear Stoplamp.
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While applying the brake pedal, measure the voltage between the LH rear lamp C412-3, circuit CLS35 (VT), harness side and ground; or between
the RH rear lamp C415-3, circuit CLS36 (YE), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
REPAIR circuit GD121 (BK/YE) for an open. TEST the system for normal operation.
No
GO to G10.