Pinpoint Tests

Daytime Running Lamps (DRL)

Pinpoint Tests

Pinpoint Test F: The Daytime Running Lamps (DRL) Are Inoperative

Normal Operation

When the ignition is in RUN, the headlamps are not on (from the autolamp system or manual control from the headlamp switch), and the transmission is not in park, the Body Control Module (BCM) 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:

- Exterior lighting system input/output
- Transmission gear input
- BCM

PINPOINT TEST F: THE DRL ARE INOPERATIVE

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F1 VERIFY THE DRL OPERATION

- Ignition ON.
- Place the headlamp switch in the OFF position.
- Place the gear selector lever in any gear other than PARK (P).
- Are the DRL illuminated?

Yes
The system is operating correctly. INFORM the customer of the conditions required for the DRL to operate correctly.

No
GO to F2.

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F2 CHECK THE OPERATION OF THE HEADLAMPS

- Place the headlamp switch in the HEADLAMPS ON position and observe the headlamps.
- Do the headlamps illuminate?

Yes
GO to F3.

No
GO to Pinpoint Test A Pinpoint Test A: One Or Both Low Beams Are Inoperative.

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F3 CHECK THE TRANSMISSION GEAR INPUT

- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM transmission gear status PID (TR_F) while placing the gear selector lever through all its positions.
- Does the PID agree with the gear selection?

Yes
INSTALL a new BCM. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.

No
REFER to Automatic Transaxle/Transmission - 6R80 Testing and Inspection to diagnose the transmission range input.

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