2010 Cadillac CTS Sedan AWD V6-3.6L Page 580
DTC B3410 07
- AHLD Front Axle Sensor Signal Circuit Voltage Above Threshold
DTC B3420 01
- AHLD Rear Axle Sensor Signal Circuit Short to Battery
DTC B3420 02
- AHLD Rear Axle Sensor Signal Circuit Short to Ground
DTC B3420 03
- AHLD Rear Axle Sensor Signal Circuit Voltage Below Threshold
DTC B3420 07
- AHLD Rear Axle Sensor Signal Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit/System Description
The front and rear suspension position sensors provide the headlamp control module with front and rear 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
at 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 sensors to change. The headlamp control module compares the information from the front and rear suspension
position sensors and adjusts the headlamp leveling as needed.
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
B3410 01 or B3420 01
The headlamp control module detects a short to voltage or an open/high resistance on the 5 V reference circuit.
B3410 02 or B3420 02
The headlamp control module detects a short to ground on the 5 V reference circuit.
B3410 03 or B3420 03
The headlamp control module detects a short to ground or an open/high resistance on the sensor signal circuit.
B3410 07 or B3420 07
The headlamp control module detects a short to voltage on the sensor signal circuit.
Actions Taken When the DTC Sets
* The headlamp control module disables the headlamp leveling system.
* The driver information center (DIC) will display AFL Lamps Need Service.
* On vehicles equipped with both AFL and headlamp leveling, the AFL system will remain active.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists and the ignition is cycled.
