2010 Cadillac Truck SRX AWD V6-3.0L Page 745
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
B3949
DTC B3948 or B3949
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 Descriptors
DTC B3948 02
- Left Front Turn Signal Circuit Short to Ground
DTC B3949 02
- Right Front 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
When the appropriate turn signal is commanded
Conditions for Setting the DTC
B3948 02
The BCM detects a short to ground on the left front turn signal control circuit.
B3949 02
The BCM detects a short to ground on the right front turn signal control circuit.
Action Taken When the DTC Sets
The appropriate turn signal lamp is inoperative.
Conditions for Clearing the DTC
