642doorhardtop

I think I may have two problems here, just culminating into one big cluster. My hazards will activate randomly when the truck is parked and off. I used to think it was a water issue, as the truck seems to act funny when it gets wet, but it just did it right now and the weather is bone dry. I cannot even shut my door all the way without the hazards activating, that's how bad it is right now. If I go past the first click on the striker, the hazards activate and cannot be turned off. I have done some brief research that points to a possible battery (low voltage issue), and maybe even a BCM...but I was hoping someone may have had something similar happen to them?

The second issue is the horn operation and alarm, which activates when the truck gets washed or in heavy rain. I think this problem may be a bad seal at the door harness weather boot (it isn't seated properly). I'm almost positive a good seal will fix the alarm problem, but the last time I washed it, my tire monitors malfunctioned, and now they do not read tire pressure, and I get a fault message every time I start the truck up. What are the odds I broke something expensive? (e.g. something I can't just rest with Forscan.) Could excess water activate the horn through the door harness seal?

Any advice or info is greatly appreciated. Thanks.

artsr2002

https://www.f150forum.com/f2/hazards...ndomly-490998/

52merc

Check for DTCs. Then pull the kick panel and sill plate off on the passenger side and look for moisture around the BCM. There has been several postings where water leaked into the cab and effected the wiring to the BCM.

A failing BCM could also be the problem. Good luck.

642doorhardtop

Thanks, yea I saw that thread, and a few others like it. Kind of used that as a starting point here. The battery tested good, although a little low (12.5v). I think it's the original battery. I've been tying up potential leaks around the door harness seals, where water was probably entering the connectors, but the truck went into the body shop so I haven't been able to see if it made a difference. I'll have to look into the BCM when I get it back and continue my quest.

Question: Would the BCM also control a backup sensor? I have noticed long before I ever did anything to the truck that, when washing it, I'd get a backup sensor warning on the screen and the backup obstacle detector system would not work, but only when wet. Not sure if this has anything to do with my current issues, or is just maybe a bad connector somewhere letting water in.

52merc

Yes. The PAM (Parking Aid Module) is an integral part of the BCM.

642doorhardtop

Alrighty....Well, I don't suppose the BCM is one of those convenient $40 parts to replace, lol. That's probably the last thing I'd want to go bad.

Does anyone know if there is a service manual reference for diag, or trouble trees or anything? Or do we just have to know where to poke around to find out what's wrong?

52merc

The Workshop Manual is full of pinpoint tests related to the BCM. After all, the BCM controls a good portion of what your truck does. My WSM is over 10,000 pages. And no, its not $40 to replace.

If you want to troubleshoot this and get help from here, I would start by getting FORScan and checking DTCs.

642doorhardtop

I do have Forscan and was contemplating pulling any pending codes to see if anything is happening I can't see. I know engine codes can be pending, but does the BCM work the same way? I've only seen fault messages for the TPMS and park aid sensors, and when those go away, the dash lights are normal. I guess it stands to reason that codes would be stored, huh?

642doorhardtop

I guess my last post never posted. All off these DTCs lead me to believe it could absolutely be a water-related issue (like water saturating a connector).

I cleared them, will monitor during the week, and try to see if I can get it to act up while washing it next weekend. I'm thinking painter's tape will help me isolate a location since I do not see a right or left-hand side specified in the codes, but issues with both left and right-hand lights, for example. Curiously, I'm getting cargo lamp, dome, and headlamp codes as well, which makes me wonder if water is actually getting down to the BCM itself...

For anyone curious, here's what it looked like today before I cleared the codes. (BTW - Would there happen to be a way to find the TIME a DTC was set?)

642doorhardtop

===PCM DTC P061E:00-68===
Code: P061E - Internal Control Module Brake Signal Performance

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Powertrain Control Module

===END PCM DTC P061E:00-68===

===PCM DTC P166A:00-68===
Code: P166A - Restraints Deployment Communication Circuit

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Powertrain Control Module

===END PCM DTC P166A:00-68===

===PCM DTC U1012:00-68===
Code: U1012 - Invalid Internal Control Module Monitoring Data Received from Anti-Lock Brake System (ABS) Control Module

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Powertrain Control Module

===END PCM DTC U1012:00-68===

===OBDII DTC None===
Successful DTC reading, no error codes found

Module: On Board Diagnostic II

===END OBDII DTC None===

===APIM DTC U0151:00-08===
Code: U0151 - Lost Communication With Restraints Control Module

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Accessory Protocol Interface Module

===END APIM DTC U0151:00-08===

===APIM DTC U0159:00-08===
Code: U0159 - Lost Communication With Parking Assist Control Module A

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Accessory Protocol Interface Module

===END APIM DTC U0159:00-08===

===DCDC DTC None===
Successful DTC reading, no error codes found

Module: DC to DC Converter Control Module

===END DCDC DTC None===

===PAM DTC None===
Successful DTC reading, no error codes found

Module: Parking Aid Module

===END PAM DTC None===

===BdyCM DTC U3000:49-C8===
Code: U3000 - Control Module

Additional Fault Symptom:
- Internal Electronic Failure

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC U3000:49-C8===

===BdyCM DTC B1D35:11-48===
Code: B1D35 - Hazard Switch

Additional Fault Symptom:
- Circuit Short To Ground

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B1D35:11-48===

===BdyCM DTC B121B:01-48===
Code: B121B - Keypad Input Switch

Additional Fault Symptom:
- General Electrical Failure

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B121B:01-48===

===BdyCM DTC B123B:15-48===
Code: B123B - Right Front Turn Indicator

Additional Fault Symptom:
- Circuit Short To Battery Or Open

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B123B:15-48===

===BdyCM DTC B123A:15-48===
Code: B123A - Left Front Turn Indicator

Additional Fault Symptom:
- Circuit Short To Battery Or Open

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B123A:15-48===

===BdyCM DTC B1247:15-48===
Code: B1247 - Left Rear Turn Indicator

Additional Fault Symptom:
- Circuit Short To Battery Or Open

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B1247:15-48===

===BdyCM DTC B1248:15-48===
Code: B1248 - Right Rear Turn Indicator

Additional Fault Symptom:
- Circuit Short To Battery Or Open

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B1248:15-48===

===BdyCM DTC B1D03:15-48===
Code: B1D03 - Right High Beam Circuit

Additional Fault Symptom:
- Circuit Short To Battery Or Open

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B1D03:15-48===

===BdyCM DTC B1D02:15-48===
Code: B1D02 - Left High Beam Circuit

Additional Fault Symptom:
- Circuit Short To Battery Or Open

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B1D02:15-48===

===BdyCM DTC B143E:11-48===
Code: B143E - Headlamp Switch Input

Additional Fault Symptom:
- Circuit Short To Ground

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B143E:11-48===

===BdyCM DTC B1446:15-48===
Code: B1446 - Front Park Lamps Output

Additional Fault Symptom:
- Circuit Short To Battery Or Open

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B1446:15-48===

===BdyCM DTC B14A8:11-48===
Code: B14A8 - Dome Switch Input

Additional Fault Symptom:
- Circuit Short To Ground

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B14A8:11-48===

===BdyCM DTC B14A7:11-48===
Code: B14A7 - Puddle/Cargo Switch Input

Additional Fault Symptom:
- Circuit Short To Ground

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Body Control Module

===END BdyCM DTC B14A7:11-48===

===IPMB DTC None===
Successful DTC reading, no error codes found

Module: Image Processing Module B

===END IPMB DTC None===

===FCIM DTC U0155:00-08===
Code: U0155 - Lost Communication With Instrument Panel Cluster (IPC) Control Module

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Front Controls Interface Module

===END FCIM DTC U0155:00-08===

===FCIM DTC U0253:00-08===
Code: U0253 - Lost Communication With Accessory Protocol Interface Module

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Front Controls Interface Module

===END FCIM DTC U0253:00-08===

===FCIM DTC U0401:82-08===
Code: U0401 - Invalid Data Received from ECM/PCM A

Additional Fault Symptom:
- Alive/Sequence Counter Incorrect/Not Updated

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Front Controls Interface Module

===END FCIM DTC U0401:82-08===

===FCIM DTC U0452:82-08===
Code: U0452 - Invalid Data Received From Restraints Control Module

Additional Fault Symptom:
- Alive/Sequence Counter Incorrect/Not Updated

Status:
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Front Controls Interface Module

===END FCIM DTC U0452:82-08===

===TRM DTC None===
Successful DTC reading, no error codes found

Module: Trailer Module

===END TRM DTC None===

===OCS DTC None===
Successful DTC reading, no error codes found

Module: Occupant Classification System Module

===END OCS DTC None===

===TCCM DTC None===
Successful DTC reading, no error codes found

Module: Transfer Case Control Module

===END TCCM DTC None===

===ABS DTC None===
Successful DTC reading, no error codes found

Module: Antilock braking system

===END ABS DTC None===

===PBM DTC None===
Successful DTC reading, no error codes found

Module: Park Brake Control Module

===END PBM DTC None===

===RTM DTC None===
Successful DTC reading, no error codes found

Module: Radio Transceiver Module

===END RTM DTC None===

===PDM DTC None===
Successful DTC reading, no error codes found

Module: Passengers Door Control Unit

===END PDM DTC None===

===DDM DTC None===
Successful DTC reading, no error codes found

Module: Drivers Door Module

===END DDM DTC None===

===RCM DTC None===
Successful DTC reading, no error codes found

Module: Restraint Control Module

===END RCM DTC None===

===PSCM DTC None===
Successful DTC reading, no error codes found

Module: Power Steering Control Module

===END PSCM DTC None===

===ACM DTC None===
Successful DTC reading, no error codes found

Module: Audio Control Module

===END ACM DTC None===

===SCCM DTC None===
Successful DTC reading, no error codes found

Module: Steering Column Control Module

===END SCCM DTC None===

===IPC DTC None===
Successful DTC reading, no error codes found

Module: Instrument Panel Control Module

===END IPC DTC None===

===GWM DTC None===
Successful DTC reading, no error codes found

Module: Gateway Module A

===END GWM DTC None===