Weird issues after replacing the battery

EMERY416

MEMBER
2005 CADILLAC STS
3.6L
V6
2WD
AUTOMATIC
115,000 MILES

My battery was dead, so I replaced it. Since then the following happens:

Alarm goes off - randomly, with no on near it;
HVAC air - no longer blows on floor or up to windshield, only the main vents (temp control still works). This is all the time;
Car tells me the hood is unlatched, when it isnt - this is random;
Passenger car door wont open from the outside - randomly. Sometimes it works and sometimes it wont
The driver settings will disappear. I have the mirrors/seats/settings set up and every so often, I will get in and it will be set to something different - and ill have to reset it all.

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Hello,

It sounds like you had a voltage spike when connecting the new battery or the car was jumped backward. Anyway the IPM sounds like it is not working correctly but to be sure we need to do a CAN scan which is the new way to fix cars which you can get a scanner from Amazon for about $50.00. Here is a video of the job being done with instructions on how to check the fuses (just in case) and how to replace the IPM below:

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

INSTRUMENT PANEL MODULE PROGRAMMING AND SETUP

INSTRUMENT PANEL MODULE (IPM) REPLACEMENT
If the instrument panel module (IPM) is replaced, the following procedures must be performed:
1. Setup New IPM
2. Program vehicle identification number (VIN)
3. Brake pedal position (BPP) sensor calibration

Refer to Body Control Module (BCM) Programming/RPO Configuration (IPM) Body Control Module (BCM) Programming/RPO Configuration (RIM) in Computer/Integrating Systems.

INFLATABLE RESTRAINT SENSING AND DIAGNOSTIC MODULE (SDM) REPLACEMENT
If the inflatable restraint sensing and diagnostic module (SDM) is replaced, update the SDM number in IPM. This number also called restraints ID represents the last four digits of SDM part number. On the Tech 2 menu Module Setup > SDM, perform Setup SDM Part Number in IPM function.

BRAKE PEDAL POSITION (BPP) SENSOR REPLACEMENT
If the brake pedal position (BPP) sensor is replaced, the BPP Sensor Calibration procedure must be performed. Refer to Brake Pedal Position Sensor Calibration in Lighting Systems.

Check out the diagrams (below). Please let us know what happens.

Images (Click to make bigger)