News Technical Service Bulletins

Check Honda Aftermarket and LED Bulbs

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TOY01 (1).png

Example of screen shot with headlights on with aftermarket bulbs. 

| Photo Credit: Mitchell 1

Some 2014-2020 Toyota 4Runner vehicles may experience the ABS light on with DTC C0226, C0236, C0246 and C0256 stored current in the ABS system. Use a picoscope to monitor the ground to the skid control ECU with the engine running and headlights on, then with the headlights off. 

TOY02 (1).pngExample with headlights off, with aftermarket bulbs. Note the difference in the ground circuit.
|Photo Credit: Mitchell 1


If the ground circuit voltage fluctuates with the headlights on compared to off, inspect the headlight bulbs for any aftermarket parts such as LED or HID bulbs. If aftermarket bulbs are found, perform the same test with factory original bulbs.

TOY03.jpgInspect the aftermarket LED or HID headlight bulbs.
|Photo Credit: Mitchell 1 


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