Regulated Voltage Control Calibration Improvements

Under certain driving conditions and customer usage, the battery state of charge may deteriorate over time and fail to recover.

This can result in a battery that does not have sufficient charge to start the engine or causes vehicle faults that could be attributed to low battery voltage. This could also include low voltage Diagnostic Trouble Codes (DTCs) that may be more prone to setting during or just after engine cranking.

Regulated Voltage Control defines rate of charge under vehicle operating conditions to minimize impact on fuel consumption and powertrain performance during battery charging. Conservative Regulated Voltage Control (RVC) calibrations have been identified as contributing to battery state of charge issues, particularly in recovering from a discharged state.

Revised RVC calibrations have been introduced. Some of the changes that are included in the revised calibrations are:

Important: The following procedure is only to be performed on vehicles that are believed to exhibit a battery voltage related concern and that are built prior to the above listed VIN breakpoint.

Important: If the vehicle's battery is suffering from sulfation damage or other defects, the revised RVC calibrations will not correct these conditions. Please ensure that the battery is fully charged and tests successfully before installing the revised RVC calibration.

Current Draw Elimination

Prior to SPS programming of the BCM, ensure that the CD player Integrated Radio Chassis (IRC) is functioning correctly. If the IRC has a mechanical error, it can draw significant current and result in battery discharge.

1. Check for a "CD Error" or "Mech Error" message on the display. Check for DTCs B1243, B1245 or B1248. If any of these messages or DTCs are displayed, replace the IRC (obtained through Blaupunkt Change over Procedure). If there are no error messages, proceed to Step 2.
2. Insert and eject a CD to confirm the IRC is operational. If the CD cannot be inserted or ejected successfully, replace the IRC (obtained through Blaupunkt Change over Procedure).

When both of these checks are completed successfully, go to SPS Programming of New RCV Calibration.

SPS Programming of New RVC Calibration

Important: Prior to programming, ensure the battery is fully charged.

Perform Service Programming (SPS) of the Body Control Module (BCM) from TIS2WEB or TIS DVD 2006/04 or later.

After SPS Programming

After SPS programming has been completed it will be necessary to relearn both the brake position sensor and the SDM primary key to the BCM.

This can be done by selecting the following on the Tech 2®:

Select "Brake pedal position sensor learn" and follow the Tech 2® prompts.

After this has completed, select "Program SDM primary key to BCM" and follow the Tech 2® prompts.

After programming has completed, check for and clear all DTCs.

If the vehicle is equipped with Rear Seat Entertainment (RSE), remove the RSE fuse (fuse 1) in the trunk compartment fuse box for 30 seconds.

For vehicles repaired under warranty, use: