SERVICE PRECAUTIONS <DISCHARGE HEADLAMP>


Before checking the discharge headlamp related parts, be sure to read the following warnings and precautions carefully, and then perform necessary operations.
danger
  • Do not touch the socket and the connector while the headlamps are on. High voltage is applied to the bulb socket and connector during headlamp operation. The operator may be burnt or dead due to an electric shock by high voltage.
  • Do not attempt to use a tester to check them. If the bulb socket and connectors should be inspected using a tester, the operator may be burnt or dead due to an electric shock by high voltage.
  • Do not turn ON the headlamps while the headlamp bulb assembly is removed. If the headlamps are turned ON with the headlamp bulb assembly removed, the operator may get burned by the bulb of a high temperature. The operator may be burnt or dead due to an electric shock by high voltage.
  • Before service work, turn the lighting switch OFF and disconnect the battery terminal and the headlamp bulb assembly connector in a dry place. Do not touch the components with wet hands. If you work on the components with wet hands or in wet conditions, the operator may be burnt or dead due to an electric shock by high voltage.
warning Do not illuminate the bare headlamp bulb. (Do not illuminate the headlamp using other than the vehicle power supply.) If the headlamp bulb illuminates without fitting it in the headlamp unit, it may burst due to rise in its internal pressure.
caution When reusing the headlamp bulb assembly with the discharge headlamp damaged, observe the inspection procedures for the related parts of the discharge headlamp before determining the reusability of the headlamp bulb assembly. If you fail to observe "How to check discharge headlamp components," the vehicle may be damaged.

1. CHECKING PROCEDURE FOR DISCHARGE HEADLAMP RELATED PARTS (INSPECTION PROCEDURE WHEN REUSING THE HEADLAMP BULB ASSEMBLY)


1 - 1 VISUAL CHECK OF HEADLAMP BULB ASSEMBLY


If any of the check items below are found, replace the headlamp bulb assembly.
Items to be checked
 Why the headlamp bulb assembly should be replaced
Obvious deformation (warping, twisting, dents, nicks, chipped edges) of headlamp bulb assembly
 The printed circuit board or the element(s) may be cracked
Damaged connector (chipped or cracked plastics, or deformed terminal)
 The damaged part(s) may cause poor connection or short circuit.

1 - 2 CHECK OF HEADLAMP BULB ASSEMBLY OPERATION


If any of the abnormalities below are found, replace the headlamp bulb assembly.
note Ensure that the headlamp control system and its circuit (power supply control at engine start and during steady illumination, high-voltage generating circuit, etc.) are working normally. Then, check whether any internal breakage has occurred in the headlamp bulb assembly. However, some internal breakage may not be found.
Check item (Check of illumination operation)
With the headlamp bulb in the cold state (with the lamp turned off for 10 minutes or more) and in warm state (after the lamp is illuminated for 15 minutes or more, it is turned off for 1 minute), turn ON and OFF the headlamp several times, and then check that the headlamp illuminates without fail.
Observe the headlamps until they illuminate steadily (approximately 5 minutes after switching on them). Check that the headlamps do not flash or flicker.
Turn on the headlamps for 30 minutes. Check that the brightness is the same between right and left lamps.
Turn on the headlamps for 30 minutes. Check that the headlamps do not flash or flicker for 30 minutes.

2. Troubleshooting procedure for discharge headlamp (diagnostic procedure for malfunctions)



  1. Check that the connectors are connected securely and the fuse has not been blown.
  2. Before troubleshooting, read through the "Symptom chart" to understand what and how you should do. Follow all the procedures carefully.
  3. The components should be checked with their connectors disconnected.

SYMPTOM CHART


Item to be checked
 Trouble symptom
The headlamps do not illuminate.
 The headlamps flicker.
 The headlamps are dim.
Fuse
 1
 -
 -
Wiring harness and connector
 2
 1
 -
Column switch
 3
 -
 -
headlamp bulb assembly
 4
 2
 1
ETACS-ECU
 5
 3
 -
note
  1. The numbers indicate the sequence in which the component is checked.
  2. For the troubleshooting of other than the above, refer to Trouble Symptom Chart.
  3. If ETACS-ECU fails, only the low-beam headlamps will illuminate as a fail-safe measure.