Pinpoint Tests

Daytime Running Lamps (DRL)

Pinpoint Tests

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

Normal Operation

When the ignition is in the RUN state, 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:

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


PINPOINT TEST Z: THE DRL ARE INOPERATIVE

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Z1 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).
- 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


- Review the recorded results from the SJB self-test.
- Are any DTCs present?

Yes
REFER to Multifunction Electronic Modules Testing and Inspection.

No
GO to Z3.

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Z3 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 Z4.

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

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Z4 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.
- Does the PID agree with the ignition switch positions?

Yes
GO to Z5.

No
REFER to Steering Column Switches Initial Inspection and Diagnostic Overview to diagnose the input from the ignition switch.

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Z5 CHECK THE TRANSMISSION GEAR INPUT


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM 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 Z6.

No
REFER to Automatic Transaxle/Transmission - 4R70E/4R75E or Automatic Transaxle/Transmission - TorqShift(R) Testing and Inspection to diagnose the transmission gear input.

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Z6 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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