2010 Cadillac CTS Sedan AWD V6-3.6L Page 579

2010 Cadillac CTS Sedan AWD V6-3.6L Page 579

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate headlamp leveling sensor.

2. Ignition OFF, test for less than 10.0 ohm between the low reference circuit terminal C and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the

headlamp control module.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the headlamp control module.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the headlamp

control module.

4. Verify the appropriate scan tool Leveling Position Sensor parameter is less than 0.5 V.

瀚慖f greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the headlamp

control module.

5. Install a 3 A fused jumper wire between the signal circuit terminal B and the 5 V reference circuit terminal A. Verify the appropriate scan

tool Leveling Position Sensor parameter is greater than 4.8 V.

瀚慖f less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the

headlamp control module.

6. If all circuits test normal, replace the headlamp leveling sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Headlamp Leveling Front Suspension Height Sensor Replacement (See: Lighting and Horns/Headlamp/Service and Repair/Removal and

Replacement/Headlamp Leveling Front Suspension Height Sensor Replacement)

* Headlamp Leveling Rear Suspension Height Sensor Replacement (See: Lighting and Horns/Headlamp/Service and Repair/Removal and

Replacement/Headlamp Leveling Rear Suspension Height Sensor Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for headlamp control module replacement, setup,

and programming

B3420

DTC B3410 or B3420

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 B3410 01

- AHLD Front Axle Sensor Signal Circuit Short to Battery

DTC B3410 02

- AHLD Front Axle Sensor Signal Circuit Short to Ground

DTC B3410 03

- AHLD Front Axle Sensor Signal Circuit Voltage Below Threshold