Pinpoint Tests

Daytime Running Lamps (DRL)

Pinpoint Tests

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

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 transmission is not in PARK (P), the Smart Junction Box (SJB) illuminates the headlamps at a reduced intensity.

This pinpoint test is intended to diagnose the following:

- Exterior lighting system input/output
- SJB configuration
- Ignition switch input
- Transmission gear input
- SJB

PINPOINT TEST AF: THE DRL ARE INOPERATIVE

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AF1 VERIFY THE DRL OPERATION


- Ignition ON.
- Make sure the headlamp switch is in the OFF position.
- Place the gear selector lever in any gear other than PARK (P).
- 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 AF2.

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AF2 CHECK THE OPERATION OF THE HEADLAMPS


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

Yes
GO to AF3.

No
REFER to Headlamps Special Tool(s) Used With Diagnostics.

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AF3 CHECK THE IGNITION SWITCH INPUT


- Place the headlamp switch in the OFF position.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Monitor the SJB ignition switch PID (IGN_O_ECU, IGN_A_ECU, IGN_R_ECU, and IGN_S_ECU) while cycling the ignition switch through all its positions.
- Do the PIDs agree with the ignition switch positions?

Yes
GO to AF4.

No
REFER to Steering Column Switches Testing and Inspection to diagnose the input from the ignition switch.

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AF4 CHECK THE TRANSMISSION GEAR INPUT


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

Yes
GO to AF5.

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

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AF5 CHECK THE SJB FOR DRL CONFIGURATION


- Enter the following diagnostic mode on the scan tool: SJB Configuration.
- Check the SJB configuration and make sure the DRL feature is enabled.
- Is the SJB DRL configuration enabled?

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

No
ENABLE the DRL configuration. TEST the system for normal operation.

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