Circuit Description

TBC monitors voltage on circuit No. 524 (Purple wire) to determine amount of voltage present in the high beam circuit. When circuit is shorted to battery voltage or ground and DRL are requested on, DTC will set. TBC module monitors circuit No. 524 (Purple wire) to determine if DRL are on or if high beams are on.

Conditions for setting DTC:

• Circuit No. 524 is open or shorted to battery voltage or ground, and TBC module commands DRL relay on.
• System voltage 9-16 volts.
• Conditions met for .5 second.