Circuit Description

TBC module monitors voltage in circuit No. 352 (White wire) to determine if headlight power relay was requested ON. See WIRING DIAGRAMS  . If voltage in this circuit is low and headlight request circuit (White wire) is pulled to ground, DTC will set. TBC module uses this circuit (White wire) to determine actual state of headlight power relay circuit. TBC module also monitors ignition switch position based on ignition signal inputs.

Conditions for setting DTC:

• When there is short to ground in circuit No. 352 (White wire) and headlight relay was requested on.
• System voltage 9-16 volts.
• Conditions present for .5 second.