B3949

DTC B3949

Circuit Description
Ground is applied to the turn signal switch. When the turn signal switch is placed in the turn right position, ground is applied to the BCM through the right turn signal switch circuit. The BCM applies a pulsating voltage to the RF and RR turn signal lamps through the RF and RR turn signal voltage supply circuits.

Conditions for Running the DTC
The battery voltage must be between 9.0-14 volts.

Conditions for Setting the DTC
^ DTC B3949 02 A short to ground in the RF turn signal voltage supply circuit is present for longer than 0.1 seconds.
^ DTC B3949 05 A short to battery positive voltage or an open is detected in the RF turn signal voltage supply circuit is present for longer than 1 second.

Action Taken When the DTC Sets
^ If DTC B3949 02 sets, the right front turn signal lamp does not work.
^ If DTC B3949 05 sets, if the RF turn signal voltage supply circuit is shorted to battery positive voltage the right front turn signal lamp will be on at all times and if the RF turn signal voltage supply circuit is open the right front turn signal lamp will be inoperative.

Conditions for Clearing the DTC
^ The DTC will clear on current status after the condition for setting the fault is corrected.
^ DTC B3949 will set a history code which will clear after 100 consecutive ignition cycles without a fault present.

Diagnostic Aids
^ Check the RF turn lamp bulb. If the bulb is open, DTC B3948 05 will be set.
^ If the DTC is a history DTC, the fault may be intermittent.
^ An intermittent short to ground or an open in the following locations may cause an intermittent malfunction to occur:
- The BCM
- The underhood electrical center
- The right front turn signal supply voltage circuit