2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 660
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 B51 headlamp leveling sensor.
2. Test for less than 5 ohm between the low reference circuit terminal 3 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 K28
headlamp leveling control module.
3. Ignition ON, test for 4.8-5.2 V between the 5V reference circuit terminal 1 and ground.
瀚慖f less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the K28 headlamp leveling control module.
瀚慖f greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K28 headlamp
leveling control module.
4. Verify the appropriate scan tool Leveling Position Sensor parameter is 0 V.
瀚慖f greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the K28
headlamp leveling control module.
5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5V reference circuit terminal 1. Verify the appropriate scan tool
Leveling Position Sensor parameter is greater than 5 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
K28 headlamp leveling control module.
6. If all circuits test normal, replace the B51 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 leveling 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
- Automatic Headlamp Leveling Control Module Front Axle Sensor Signal Circuit Short to Battery
DTC B3410 06
- Automatic Headlamp Leveling Control Module Front Axle Sensor Signal Circuit Low Voltage/Open
DTC B3420 01
- Automatic Headlamp Leveling Control Module Rear Axle Sensor Signal Circuit Short to Battery
DTC B3420 06
- Automatic Headlamp Leveling Control Module Rear Axle Sensor Signal Circuit Low Voltage/Open
Diagnostic Fault Information
