E 450 V8-5.4L (2009)
Daytime Running Lamp: Pinpoint Tests
Daytime Running Lamps (DRL)
Pinpoint Tests
Pinpoint Test Z: The Daytime Running Lamps (DRL) Are Inoperative
Normal Operation
When the ignition switch is in the RUN position, the headlamps are not on, the transmission is not in PARK (P), the Smart Junction Box (SJB) provides
a pulse-width modulated voltage to the low beam headlamps. This illuminates the headlamps at a reduced intensity.
This pinpoint test is intended to diagnose the following:
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Exterior lighting system input/output
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SJB configuration
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Ignition switch input
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Transmission gear input
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SJB
PINPOINT TEST Z: THE DRL ARE INOPERATIVE
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Z1 VERIFY THE DRL OPERATION
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Ignition ON.
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Place the headlamp switch in the OFF position.
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If equipped with an automatic transaxle, place the gear selector lever in any gear other than PARK (P).
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If equipped with a manual transaxle, release the parking brake.
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Do the DRL illuminate?
Yes
The system is operating correctly. INFORM the customer of the conditions required for the DRL to operate correctly.
No
GO to Z2.
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Z2 CHECK FOR RECORDED SJB DTCs
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Review the recorded results from the SJB self-test.
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Are any DTCs present?
Yes
REFER to Body Control Systems.
No
GO to Z3.
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Z3 CHECK THE OPERATION OF THE HEADLAMPS
