B3950
DTC B3950
CIRCUIT DESCRIPTION
The body control module (BCM) controls the left rear turn signal and hazard lamp. The BCM supplies voltage to control the lighting functions. The BCM monitors the left rear stop/turn lamp supply voltage circuit for proper operation.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B3950 Left Rear Turn Signal Circuit
CONDITIONS FOR SETTING THE DTC
B3950 02
Will set if there is a short to ground in the left rear turn signal circuit
B3950 05
Will set if there is an open or short to voltage in the left rear turn signal circuit
ACTION TAKEN WHEN THE DTC SETS
- The Service Vehicle Soon message will be displayed.
- Stores a DTC B3950 in the BCM memory
- If the failure is an open, short to ground, or to power, the rear turn signal flashes at double rate.
CONDITIONS FOR CLEARING THE DTC
- This DTC requires an ignition cycle in order to change from current to history.
- The BCM no longer detects continuous battery voltage on the LH turn signal monitor circuit for longer than 5 seconds.
- A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
DIAGNOSTIC AIDS
- The following conditions may cause an intermittent malfunction:
- There is an intermittent short to voltage in the LH turn signal monitor circuit.
- The turn signal switch or the hazard switch is shorted internally or is sticking.
- If the BCM detects continuous voltage on the LH turn signal monitor circuit, the BCM interprets this as a short to voltage. The BCM will continue with normal daytime running lights (DRL) operation, and the LR turn signal will remain inoperative.
- If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur.
TEST
