Pinpoint Tests

Daytime Running Lamps (DRL)

Pinpoint Tests

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

Normal Operation

When the ignition switch is in the RUN position, the parking brake is not applied and the headlamps are not requested on from the headlamp switch, 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:

- Parking brake switch input concern
- Headlamp operation
- Ignition switch input concern
- SJB



PINPOINT TEST W: THE DRL ARE INOPERATIVE

-------------------------------------------------
W1 VERIFY THE DRL OPERATION


- Ignition ON.
- Verify the parking brake is fully released.
- 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 W2.

-------------------------------------------------
W2 CHECK THE BRAKE WARNING INDICATOR (DRL INOPERATIVE)


- Observe the brake warning indicator.
- Is the brake warning indicator illuminated?

Yes
REFER to Instrument Panel, Gauges and Warning Indicators to diagnose the brake warning indicator.

No
For vehicles with halogen headlamps, GO to W3.

For vehicles with High Intensity Discharge (HID) headlamps, GO to W4.

-------------------------------------------------
W3 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 W5.

No
REFER to Headlamps Testing and Inspection.

-------------------------------------------------
W4 CHECK THE OPERATION OF THE FOG LAMPS


- Place the headlamp switch in the PARKING LAMPS ON position and engage the fog lamp switch.
- Do the fog lamps operate correctly?

Yes
GO to W5.

No
REFER to Fog Lamps Testing and Inspection.

-------------------------------------------------
W5 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_SW) while cycling the ignition switch through all its positions.
- Does the PID agree with the ignition switch positions?

Yes
INSTALL a new SJB. TEST the system for normal operation.

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

-------------------------------------------------