2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 747
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Side Turn Signal Lamp Bulb Replacement (See: Lighting and Horns/Turn Signals/Turn Signal Lamp/Turn Signal Bulb/Service and
Repair/Front Side Turn Signal Lamp Bulb Replacement)
* Front Turn Signal Lamp Bulb Replacement (T84, T85 Driver Side Headlamp) (See: Lighting and Horns/Turn Signals/Turn Signal
Lamp/Turn Signal Bulb/Service and Repair/Front Turn Signal Lamp Bulb Replacement (T84, T85 Driver Side Headlamp))Front Turn Signal
Lamp Bulb Replacement (T84, T85 Passenger Side Headlamp) (See: Lighting and Horns/Turn Signals/Turn Signal Lamp/Turn Signal
Bulb/Service and Repair/Front Turn Signal Lamp Bulb Replacement (T84, T85 Passenger Side Headlamp))Front Turn Signal Lamp Bulb
Replacement (TT6,TT7,TT8 Passenger Side Headlamp) (See: Lighting and Horns/Turn Signals/Turn Signal Lamp/Turn Signal
Bulb/Service and Repair/Front Turn Signal Lamp Bulb Replacement (TT6,TT7,TT8 Passenger Side Headlamp))Front Turn Signal Lamp
Bulb Replacement (TT6,TT7,TT8 Driver Side Headlamp) (See: Lighting and Horns/Turn Signals/Turn Signal Lamp/Turn Signal
Bulb/Service and Repair/Front Turn Signal Lamp Bulb Replacement (TT6,TT7,TT8 Driver Side Headlamp))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup and programming
B3950
DTC B3950 or B3951
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B3950 02
- Left Rear Turn Signal Circuit Short to Ground
DTC B3951 02
- Right Rear Turn Signal Circuit Short to Ground
Diagnostic Fault Information
Circuit/System Description
Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the
ON or START position. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is
applied to the body control module through either the right turn or left turn signal switch signal circuit. The BCM then applies a pulsating voltage to
the front and rear turn signal lamps through there respective voltage supply circuits. When a turn signal request is received by the BCM, a serial
data message is sent to the instrument cluster requesting the respective turn signal indicator be pulsed ON and OFF.
Conditions for Running the DTC
The appropriate turn signal is active
Conditions for Setting the DTC
The BCM detects a short to ground on the rear turn signal control circuit
Action Taken When the DTC Sets
