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CHAPTER 39

CHAPTER 39. Lighting Systems. Checking Lighting and Peripheral Systems. 39-1.

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CHAPTER 39

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  1. CHAPTER 39 Lighting Systems

  2. Checking Lighting and Peripheral Systems 39-1 • In a darkened area, turn on or activate the ignition. The dash warning lights should be displayed. Start the engine. If any warning light stays on after the engine is started, it could indicate a problem in one of the vehicle's safety or mechanical systems. If you are unsure about what any of the warning lights mean, consult the owner's manual. • Make sure the vehicle's horn is working. If the horn is not working, locate it under the hood with the help of manufacturer's information. Check the wiring to make sure there is a good contact. If necessary, use a wiring diagram and DVOM to isolate the fault.

  3. Checking Lighting and Peripheral Systems 39-1 • Have someone stand behind the vehicle to report any problems. Turn the ignition to run. Switch on the park lights, taillights, marker lights, and license plate lights. Do the same for left and right turn indicator lights. Depress the brake pedal to make sure the brake lights work and have the proper intensity. Also, place the transmission in reverse and check the backup lights. • With someone in front of the vehicle, make sure the high and low headlight beams, park lights, turn signals, driving lights, fog lights, and cornering lights are all working properly.

  4. Checking Lighting and Peripheral Systems 39-1 • With the interior light switch in the correct position, open the driver's side door to make sure the interior lights work. • If any of these lights do not operate, you may need to replace a bulb, or diagnose the fault.

  5. Checking and Changing an Exterior Light Bulb 39-2 • Remove the cover to expose the bulb. If the bulb is pin mounted, gently grip the bulb and push it inward. Turn the bulb slightly counterclockwise and remove it from the bulb holder.

  6. Checking and Changing an Exterior Light Bulb 39-2 • Inspect the bulb holder to make sure there is no corrosion. If there is, clean it with a bulb socket wire brush or emery cloth.

  7. Checking and Changing an Exterior Light Bulb 39-2 • Insert the new bulb into the bulb holder, depress it fully, turn it slightly clockwise, and release it. Test it by switching it on and off. Then replace the cover, and test it again.

  8. Checking and Changing a Headlight Bulb 39-3 • Test the vehicle headlights. Obtain the replacement lamp for the vehicle. Unplug the electrical connector at the back of the lamp unit.

  9. Checking and Changing a Headlight Bulb 39-3 • Remove the old bulb and replace it with the new one. Handle the new bulb only by its base or, if supplied, by the card cover.

  10. Checking and Changing a Headlight Bulb 39-3 • Replace the unit and the retaining ring or bulb assembly, and then plug in the connector. Switch on the lights again to confirm that they are both operating correctly.

  11. Aiming Headlights 39-4 • Make sure the tires are inflated properly, the wheels point straight ahead, and there is no extra weight in the vehicle. Position the vehicle correctly in relation to the headlamp aligner unit following the equipment manufacturer's instructions. Calibrate the aligner for any floor slope and for the vehicle being tested.

  12. Aiming Headlights 39-4 • On the types of aligners that require the headlights to be on during alignment, turn the headlights on to a low beam setting. The center of the illuminating beams should be in the lower right quadrants of the chart or wall markings or as specified by the manufacturer.

  13. Aiming Headlights 39-4 • The high beam should be centered, falling on the intersections of the horizontal and vertical marks or as specified by the manufacturer. If necessary, turn the adjustment screws on the headlight so the lights point to the correct places or bubbles on the levels are centered, depending on the type of aligner equipment you are using.

  14. Checking Digital Instrument Circuits 39-5 • Identify the digital circuit to be tested. Research the correct test procedure from the manufacturer's information. • Check fault codes and circuit PIDs using a scan tool. • Inspect the sensor, wires, and connectors. • Test the sensor with a DVOM or oscilloscope to determine correct output. • If the sensor tests OK, check the wiring harness for continuity back to the instrument panel, and determine necessary action.

  15. Checking Warning Device Operation 39-6 • Identify the circuit to be tested. Research the correct test procedure from the manufacturer's information. • Check fault codes and circuit PIDs using a scan tool. Inspect the sensors, wires, and connectors. • Test the affected circuit and any sensors with a DVOM or oscilloscope to determine the correct output. • If sensors or devices test OK, check the individual circuits for continuity. • Identify the circuit to be tested. Research the correct test procedure from the manufacturer's information.

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