B3951
DTC B3951
Circuit Description
Ground is applied by the turn signal switch. When the turn signal switch is placed in the turn right position, ground is applied to the body control module (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 lamp supply voltage circuits.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B3951 Right Rear Turn Signal Circuit
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
A short to ground or an open in the RR turn signal lamp supply voltage circuit is present for longer then 0.1 seconds.
Action Taken When the DTC Sets
The right rear turn signal lamp does not work.
Conditions for Clearing the DTC
* The DTC will clear on current status after the condition for setting the fault is corrected.
* DTC B3951 will set a history code which will clear after 100 consecutive ignition cycles without a fault present.
* History and current DTCs can be cleared using a scan tool.
Diagnostic Aids
* Check the RR turn lamp bulb. If the bulb is open, DTC B3950 will be set.
* If the DTC is a history DTC, the fault may be interment. refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics
* An interment short to ground or an open in the following locations may cause an intermittent malfunction to occur:
- The BCM
- The right rear turn signal lamp supply voltage circuit
Test
