2010 Cadillac Truck SRX FWD V6-3.0L Page 745

2010 Cadillac Truck SRX FWD 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