2010 Cadillac CTS Sedan AWD V6-3.6L Page 582

2010 Cadillac CTS Sedan AWD V6-3.6L Page 582

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 B3435 00

- AHLD Left Servo Driver Circuit

DTC B3435 02

- AHLD Left Servo Driver Circuit Short to Ground

DTC B3435 39

- AHLD Left Servo Driver Circuit Internal Electronic Failure

DTC B3435 54

- AHLD Left Servo Driver Circuit Over Temperature

DTC B3440 00

- AHLD Right Servo Driver Circuit

DTC B3440 02

- AHLD Right Servo Driver Circuit Short to Ground

DTC B3440 39

- AHLD Right Servo Driver Circuit Internal Electronic Failure

DTC B3440 54

- AHLD Right Servo Driver Circuit Over Temperature

Diagnostic Fault Information

Circuit/System Description

Each headlamp assembly contains a headlamp leveling motor that is controlled by the headlamp control module. The front and rear suspension

position sensors provide the headlamp control module with suspension position information. Each sensor receives a 5 V reference, signal, and low

reference circuits from the headlamp control module. The sensors are connected to the control arms of the front and rear suspension. As the vehicle

travels, the suspension compresses and rebounds moving the suspension position sensor arms. This causes the signal output of the sensor to change.

The headlamp control module compares the information from both suspension position sensors and adjusts the headlamp leveling as needed. The

headlamp control module is wired to each headlamp leveling motor with 4 directional motor control circuits.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.

* Ignition in the ON or RUN position.

* Headlamps ON.

Conditions for Setting the DTC

B3435 00

The headlamp control module detects a short to voltage or an open/high resistance on any of the left motor control circuits.