2010 Cadillac CTS Sedan AWD V6-3.6L Page 281
6. If all circuits test normal, replace the headlamp control module.
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
Immobilizer With Y41
DTC B1015 (with Y41)
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 Descriptor
DTC B1015 00
- Vehicle Identification Number (VIN) Information Error
Circuit/System Description
After a loss of battery power has been restored, the remote control door lock receiver (RCDLR) will perform a check on the stored vehicle
identification number (VIN). If the VIN is CORRECT, the RCDLR will run the VIN Timer for a programmable length of time, typically 10
minutes. The RCDLR will send a message via the serial data circuit to the instrument panel cluster (IPC) to illuminate the SECURITY indicator.
After the VIN Timer has timed out, the security indicator will turn OFF. If the VIN is INCORRECT, the RCDLR will send the fuel disable
password to the engine control module (ECM), via the serial data circuit. The immobilizer system considers this to be a tamper and will not allow
the vehicle to start. The RCDLR will send a message via the serial data circuit to the IPC to flash the SECURITY indicator.
Substitution detection is based on correct response from the following modules: instrument panel cluster (IPC), export body control module
(XBCM), driver door module (DDM), passenger door module (PDM). The modules compare their VIN to that stored in the VIN master on every
ignition ON cycle and report their status to the theft deterrent module.
Conditions for Running the DTC
Ignition ON
Conditions for Setting the DTC
* The VIN check flag of the RCDLR is true.
* The RCDLR has determined that the battery has been reconnected after a battery disconnect.
Action Taken When the DTC Sets
* The vehicle will not start.
* The RCDLR sends the fuel disable message via the serial data circuit to the ECM.
* The RCDLR will run the VIN Timer for a programmable length of time, typically 10 minutes.
* The RCDLR sends a message to the IPC to illuminate the SECURITY indicator.
Conditions for Clearing the DTC
The RCDLR clears the current DTC when the correct VIN information is present.
Reference Information
Schematic Reference
Immobilizer Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer
