Pinpoint Test I: The Daytime Running Lamps (DRL) Are On With The Ignition Switch Off
Daytime Running Lamps (DRL)
Pinpoint Tests
Pinpoint Test I: The Daytime Running Lamps (DRL) Are On With The Ignition Switch Off
Normal Operation
When the ignition is in RUN, voltage is sent to the headlamp switch. When the headlamp switch is in the OFF position, voltage is routed to the Daytime Running Lamps (DRL) relay coil. The Battery Junction Box (BJB) supplies battery voltage to the DRL relay switch side. When the DRL relay is energized, voltage is sent through a resistor wire to the low beam voltage supply circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- DRL relay
- Headlamp switch
PINPOINT TEST I: THE DRL ARE ON WITH THE IGNITION SWITCH OFF
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I1 CHECK THE HEADLAMP SWITCH
- Ignition OFF.
- Disconnect: Headlamp Switch C205.
- Do the headlamps continue to illuminate?
Yes
GO to I2.
No
INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. TEST the system for normal operation.
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I2 CHECK THE DRL RELAY OUTPUT
- Disconnect: DRL Relay.
- Do the headlamps continue to illuminate?
Yes
GO to I4.
No
GO to I3.
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I3 CHECK THE DRL RELAY
- Substitute a known good relay.
- Do the headlamps continue to illuminate?
Yes
REMOVE the known good relay. REPAIR circuit 15S-LE6 (GN/YE) for a short to voltage. TEST the system for normal operation.
No
REMOVE the known good relay. INSTALL a new DRL relay. TEST the system for normal operation.
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I4 CHECK THE LOW BEAM RELAY OUTPUT
- Disconnect: Low Beam Relay.
- Do the headlamps continue to illuminate?
Yes
REPAIR the DRL/low beam relay output circuit for a short to voltage. TEST the system for normal operation.
No
GO to Pinpoint Test E Pinpoint Test E: The Low Beams Are Always On.
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