Pinpoint Test X: The Daytime Running Lamps (DRL) Are Always On
Daytime Running Lamps (DRL)
Pinpoint Tests
Pinpoint Test X: The Daytime Running Lamps (DRL) Are Always On
Normal Operation
When the ignition switch is in the RUN position, the headlamps are not on (from the autolamp system or manual control from the headlamp switch) and the transaxle is not in PARK (P), the Smart Junction Box (SJB) energizes the fog lamp relay (integrated into the SJB).
When the DRL feature is active, the SJB provides voltage to energize the DRL relay 1 coil and supplies voltage to the DRL relay 2 switched side.
Voltage passes through the DRL relay 2 (not energized) to the high beam circuit to activate the headlamp high beam shutters.
When the DRL relay 1 is not energized, ground for the LH headlamp passes through the DRL relay 1. When the DRL relay 1 energizes, ground is removed and the DRL relay 1 provides voltage to the LH headlamp ground circuit. The voltage passes through the LH headlamp and on to the LH headlamp relay (the LH and RH headlamp relays are not energized when the DRL feature is active). The voltage passes through the LH headlamp relay and is routed to the RH headlamp relay. The voltage continues to the RH headlamp bulb and then on to ground which completes the circuit.
Providing voltage to the headlamps in series (routing voltage first through the LH headlamp and then through the RH headlamp) creates the effect of illuminating the bulbs at a reduced intensity.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- DRL relay 1
- SJB
PINPOINT TEST X: THE DRL ARE ALWAYS ON
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X1 VERIFY THE DRL OPERATION
NOTE: Make sure the headlamp switch is in the OFF position.
- Ignition ON.
- Select PARK.
- Do the headlamps continue to illuminate?
Yes
GO to X2.
No
The system is operating correctly. INFORM the customer of the conditions required for the DRL to operate correctly.
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X2 VERIFY THE DRL SYSTEM IS THE CAUSE OF THE CONCERN
- Place the headlamp switch in the HEADLAMPS ON position.
- Does the LH headlamp turn off and the RH headlamp illuminate?
Yes
GO to X3.
No
If the low beams are always on, GO to Pinpoint Test E Pinpoint Test E: The Low Beam(S) Are Always On. If the high beams are always on, GO to Pinpoint Test F Pinpoint Test F: The High Beam(s) Are Always On.
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X3 CHECK THE DRL RELAY 2 OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: DRL Relay 2.
- Ignition ON.
- Do the headlamps continue to illuminate?
Yes
REPAIR circuit CLF08 (YE/VT) for a short to voltage between the DRL relay 2 and the headlamps. TEST the system for normal operation.
No
GO to X4.
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X4 CHECK THE DRL RELAY 1
- Ignition OFF.
- Disconnect: DRL Relay 1.
- Substitute a known good relay.
- Ignition ON.
- Do the headlamps continue to illuminate?
Yes
REMOVE the known good relay. GO to X5.
No
REMOVE the known good relay. INSTALL a new DRL relay 1. TEST the system for normal operation.
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X5 CHECK THE DRL RELAY 1 COIL CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SJB C2280e.
- Ignition ON.
- Measure the voltage between the DRL relay 1 pin 1, circuit CLF01 (GN/WH), BJB face side and ground.
- Is any voltage present?
Yes
REPAIR circuit CLF01 (GN/WH) for a short to voltage. TEST the system for normal operation.
No
GO to X6.
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X6 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new SJB. REFER to Body Control Systems. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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