B1015

DTC B1015

Circuit 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 vehicle theft deterrent (VTD) 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 5 correct responses from the following modules:

* Instrument panel cluster (IPC)
* Rear integration module (RIM)
* Driver door module (DDM)
* Front passenger door module (FPDM)
* Left rear door module (LRDM)
* Right rear door module (RRDM)
* Driver position module (DPM)

The modules compare their VIN to that stored in the VIN master on every ignition ON cycle and report their status to the RCDLR. The RCDLR will only check the modules status to see the 5 correct matches when a battery reconnect has been recognized within the RCDLR.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1015 Vehicle Information Number (VIN) Information Error






Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

* The VIN check flag of the theft deterrent control module is true.
* The RCDLR has determined that the battery has been reconnected after a 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 MIL/DTC

* The RCDLR clears the current DTC when the correct VIN information is present.
* The DTC can be cleared by using a scan tool.

Diagnostic Aids

The VIN information is stored during the Setup New RCDLR Module procedure on a GM SPO replacement part. When the manufacturers enable counter (MEC) is equal to 0 the VIN information cannot be changed. DTC B1015 will set when both the remote control door modules RCDLR stored VIN and the stored VIN of those modules which report to the RCDLR does not equal the VIN stored in the instrument panel module (IPM). This situation may occur if the VIN was programmed incorrectly to the IPM. Other instances of DTC B1015 would be the RCDLR and any of the modules reporting their status to the RCDLR not being properly set up.

Test Description

Step 1 - Step 9:

The numbers below refer to the step numbers on the diagnostic table:
2. The IPM is the vehicle VIN master. If the programmed VIN in the IPM is different than that of the actual vehicle VIN, DTC B1015 will be set and all the substitution flags will read YES.
4. The RCDLR compares the stored VIN of 7 modules as well as its own stored VIN to that of the IPM. If the RCDLR and any other of the 7 modules is mismatched to the VIN stored in the IPM, DTC B1015 will set.