BCM repair, programming
and cloning in metro Atlanta

Why a replacement TIPM has to be programmed — and who can write to it

A TIPM out of another vehicle carries that vehicle's VIN and its option configuration, so it will not accept the vehicle it is now in. On current Chrysler, Dodge, Jeep and RAM vehicles there is a second gate before any of that can be corrected: the Secure Gateway sits between a diagnostic tool and the vehicle network and refuses to pass any write command from an unauthenticated tool. A scan tool can read codes through it and change nothing.

Four steps are specific to these vehicles, and the first one is the reason most shops send the job away:

1. 1

   Authenticate through the Secure Gateway

   Nothing can be written to the vehicle until the tool is authenticated to the gateway. We hold authenticated access for Chrysler, Dodge, Jeep and RAM, which is the step that decides whether the job happens at your vehicle or at a dealer.

2. 2

   Establish whether the original TIPM still reads

   This decides the route and the price. A module that still answers can be copied. One that does not has to be replaced and programmed from scratch, and the security work that follows is what makes that the longer job.

3. 3

   Clone to a matched donor, or program the replacement by VIN

   A clone carries your VIN and option configuration across, so the network accepts the donor as the module it already knew. A replacement is programmed by VIN on wiTECH instead, and the options your vehicle actually has are written to it.

4. 4

   Run Proxi alignment, then verify

   Proxi alignment tells the modules on the network which configuration the vehicle is now running. Skipping it is why a correctly programmed TIPM can still produce faults that look like the original complaint. Post-scan afterwards, on the work order you keep.

Where the original still holds readable data, cloning is usually the better route — the configuration carries over and the security procedure is not needed. See how cloning works, or what we hold under authenticated Secure Gateway access.

BCM work on GM and Ford

Each manufacturer has its own name for the same idea: telling a replacement module which vehicle it is now in, and which equipment that vehicle has. Auto Module Programming holds a current subscription to both platforms below, which is what decides whether a shop can do the job at all.

Every platform we hold a current subscription for is listed on the equipment and OEM access page, alongside the interfaces and bench tools each one runs on.

How a BCM job actually runs

Six steps, in this order, every time. Most of the modules sent to us as failed are not the fault — step one exists so you do not buy one you did not need.

1. 1

   Confirm it is the BCM before anything else

   Full scan of every module with stored, pending and freeze-frame data. Battery and charging system tested under load rather than at rest. Feeds, fuses and relays to the module checked, and voltage-drop testing on its grounds — a ground that passes a visual check regularly fails under load. CAN High and CAN Low resistance and signal, to separate a failed module from a failed network.

2. 2

   Read the original and identify the exact part

   Full OEM part number and, where the platform requires it, the hardware revision. On a module that no longer answers over OBD-II we read the flash and EEPROM directly on the bench with an Autel XP400 Pro or VVDI Prog, which is what makes the next step possible on a unit the vehicle has already given up on.

3. 3

   Reflash, clone or configure — whichever the case calls for

   A software fault gets a reflash over J2534 with a CarDAQ-Plus 3. A physically failed module with readable memory gets cloned to a part-number-matched donor, keeping your VIN, option configuration and theft-deterrent data. A new module gets programmed by VIN on the manufacturer software.

4. 4

   Write the VIN and the option configuration

   RPO configuration on GM, as-built data on Ford. The BCM has to be told which options the vehicle actually has before lighting, locks, windows and the anti-theft chain behave correctly.

5. 5

   Complete the security and key procedure

   Where the platform pairs the BCM to the immobilizer, the theft-deterrent setup and key relearn run under NASTF VSP credentialing and verified ownership — ID, registration or title, and a signed authorization.

6. 6

   Post-scan and hand over the evidence

   Codes from every module before and after, the VIN, the original and donor part numbers, and the operation performed, on a work order you keep. Voltage is held throughout by a Midtronics PSC-550S at 55 A or PSC-700S at 70 A.