TROUBLESHOOTING


The headlamp are controlled by the Smart Wiring System (SWS). For troubleshooting, refer to GROUP 54B, Troubleshooting or GROUP 54C, Troubleshooting or GROUP 54D, Troubleshooting or GROUP 54E, Troubleshooting .

DISCHARGE HEADLAMP <VEHICLES FOR HONG KONG AND SINGAPORE>


SERVICE PRECAUTIONS


Be sure to read the following warnings and precautions carefully, verify the discharge headlamp related parts, 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 can 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 can be burnt or dead due to an electric shock by high voltage.
  • Do not turn on the headlamps while the controller or the bulb is removed. If the headlamps are turned on with the controller or bulb removed, the operator can get burned by the bulb of a high temperature. The operator can 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 controller 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 can be burnt or dead due to an electric shock by high voltage.
warning Be sure to turn on the headlamp using vehicle battery supply. (Do not turn it on using an external 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 controller with the discharge headlamp damaged, observe the inspection procedures for the related parts of the discharge headlamp before determining the reusability of the controller. If you fail to observe "How to check discharge headlamp components," the vehicle may be damaged.

HOW TO CHECK DISCHARGE HEADLAMP COMPONENTS. (INSPECTION PROCEDURE WHEN REUSING THE CONTROLLER)


VISUAL CHECK OF THE CONTROLLER (CASE)


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

CHECK THE WIRING HARNESS BETWEEN THE CONTROLLER AND THE BULB.


If any of the defects below are found, replace the wiring harness between the controller and the bulb.
danger If the wiring harness between the controller and the bulb is defective, always replace it. Attempting to repair the wiring harness may cause a melted harness wire. The operator can be burnt or dead due to an electric shock by high voltage.
Items to be checked
 Why the controller should be replaced
Wiring harness shield damaged
 Causing abnormal noise
Damaged connector (chipped or cracked plastics, or deformed terminal)
 Because the damaged part(s) may cause poor connection or short circuit.

CHECK THE CONTROLLER OPERATION.


If any of the defects below are found, replace the controller.
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 internal breakage has occurred in the controller. However, some internal breakage may not be able to be found.
Check item (Check how the lights illuminate.)
Turn on and off the headlamps several times when they are cold (the status after being kept extinguished for 10 minutes or more) and warm (the status after being illuminated for 15 minutes or more, and then kept extinguished for 1 minute). Verify that the headlamp illuminates without fail by repeating the ON/OFF operation of the headlamp several times.
Observe the headlamps until they illuminate steadily (approximately five minutes after switching on them). Check that the headlamps do not flash or flicker.
Turn on the headlamps for thirty minutes. Check that the brightness is the same between right and left lights.
Turn on the headlamps for thirty minutes. Check that the headlamps do not flash or flicker.

TROUBLESHOOTING PROCEDURES FOR DISCHARGE HEADLAMP (DIAGNOSIS PROCEDURES FOR MALFUNCTIONS)



  1. Check that the connectors are connected securely and the fuse has not been blown.
  2. Before starting the diagnosis, 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
 -
 -
Bulb
 4
 2
 1
Controller
 5
 3
 2
FRONT-ECU
 6
 4
 -
note
  1. The numbers indicate the sequence in which the component is checked.
  2. The troubleshooting items other than those above are controlled by the smart wiring system. For troubleshooting, refer to "GROUP 54D, Troubleshooting " or "GROUP 54E, Troubleshooting ."
  3. If the ETACS-ECU failed, only the low-beam headlamps will illuminate as a fail-safe measure.