BCM damage

Good morning,

Fuse 19 should be 30 amps. I attached the diagram for you to view for the fuse and the control.

If you have no power to fuse 19, most likely the buss bar in the fuse box has failed. That will require replacing the fuse block.

https://www.2carpros.com/articles/how-to-check-wiring

Fuse 23 sends power to many things in another fuse block. I attached those components as well. You will need to remove all the fuses controlled by the 23 and then install a new fuse and see if it still fails.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

As far as the BCM, yes the cable has to be removed to remove it. I would just replace it and have it programmed. Yes, you will lose the radio and will have to enter the unlock code as well.

Roy

Body Control Module Programming and Setup

A new body control module (BCM) must be programmed with the proper regular production option (RPO) configurations. The BCM stores the information regarding the vehicle options and if the BCM is not properly configured with the correct RPO codes the BCM will not control all of the features properly. The Tech 2 software will automatically prompt you with the various RPOs available for the vehicle. Ensure that the following conditions exist in order to prepare for BCM programming:

1. This entire procedure has been reviewed before starting
2. The battery is fully charged.
3. A CANdi module is installed between the vehicle and the scan tool.
4. The ignition switch is in the ON position.
5. The data link connector (DLC) is accessible.
6. All disconnected modules and devices are reconnected before programming.

BCM Programming

Important: Use extreme care when verifying both the VIN and Odometer reading that is set in the service BCM. Once the VIN and Odometer are set in the replacement BCM it is impossible to change them, and if there is a mismatch, the part will be rendered useless.

To setup a new replacement BCM select Vehicle Control Systems, then navigate to Computer/Integrating Systems, once in the Computer/Integrating Systems menu select Module Replacement/Setup and follow the instructions on the scan tool. After the setup procedure it is necessary to perform the Remote Start setup procedure and brake pedal position (BPP) Sensor Calibration procedure. Refer to the Importants below for further information.

If the BCM fails to accept the program, perform the following steps:

Inspect all BCM connections.
Verify that the scan tool has the latest software version.

Remote Start Calibration, (if equipped)

In order to setup the remote start feature a Techline Terminal using the Pass-Thru routine must be used. With the scan tool powered down, attach it to the vehicle then connect the Techline Terminal's RS-232 cable to the scan tool. Select Service Programming System from the Techline Terminal main screen. Select the Pass-Thru procedure from the Techline Terminal's menu selections and follow all on-screen directions. Ensure the correct programming procedure is selected based on the component being replaced or programmed. Configure the remote start feature to match the original RPO content on the vehicle.

BPP Sensor Calibration

Important: If the BCM or the brake apply sensing system (BAS) sensor is replaced, a BPP sensor calibration must be performed.

Perform the BPP Sensor Calibration using a scan tool.

SDM Part Number Learn Procedure

If the SDM is replaced the SDM part number must be learned by the BCM. Using a scan tool navigate to Vehicle Control Systems, Module Setup, Supplemental Inflatable Restraints then select Setup SDM Part Number In BCM. Follow the on screen directions.

Important: After programming, perform the following to avoid future misdiagnosis:

1. Turn the ignition OFF for 10 seconds.
2. Connect the scan tool to the data link connector.
3. Turn the ignition ON with the engine OFF.
4. Use the scan tool in order to retrieve history DTCs from all modules.
5. Clear all history DTCs.

Okay, try disconnecting the HVAC module and see if the fuse still fails. All that should control is that module and power to pin 16 of the data link connector. If it does, you have a wiring issue between the fuse and the BCM.

As far as power to 19, there is a run relay that supplies power to the fuse. I attached a diagram for you of that circuit. The run relay is part of the BCM itself and is not accessible for replacement. The BCM will have to be replaced.

Roy

Okay. The A/C module is the issue

That leaves the BCM that needs be replaced

Roy

With the testing I told you to do, the BCM is bad. That is what provides power to the data link connector.

The AC module also needs to be replaced.

Roy

No to the blower resistor. It has nothing to do with that circuit.

Roy

We already did that with the diagnostics that were performed.

I hope the plug and play works. I have always had to program the BCM.

Roy

Okay, back to the BCM.

Roy

It is very possible. Clean all the connection and retest. I doubt it will make any difference from the description.

Roy

You are welcome.

Always glad to help.

Roy

Is the pin damaged? Is the pin in the BCM loose?

Roy