Retained Accessory Power (RAP)

[rjdrew1986]

I wanted to ask if anyone has any thoughts on this issue...
I have several P04 FWD V6 cars, one of them the RAP shuts off only about half the time when a door is opened.
- It does not appear to be a door switch because the 'Door Ajar' consistently displays when any door is open.
- It does not appear to be anything with the RAP relay because when the RAP fails to shut off (when a door is opened) it effects the Radio, windows & wipers.
- It appears to be random when it when it works correctly vs. not. If there was one pattern that I 'think' might exist, it is if the car sits for a period of time, the RAP seems to then behave normal.

Searching through posts in this and other forums, others suggest (3) possible suspects...
- The BCM is randomly getting an accessories input (for those who suggest this, they say this is revealed by wiggling the key). I haven't perceived any inconsistencies with the key).
- A faulty Drivers Door Module.
- A faulty BCM. The values stored in the BCM seem to be working well.

It's more of a nuisance than a big deal but I thought it would be interesting to hear if anyone else had any thoughts to offer.

[ironduke]

Find the schematic for the door latch, the trucks had 2 wires going to ground when the door was opened for some reason. One of them killed rap and the other one turned on the interior lights,etc.. There was a bulletin back then when you changed the latch the new latch only had 1 switch instead of 2 so you had to tie the 2 circuits together in the door harness.

Depending on age I can look up and get you a schematic or 2 from SI.
Edited.. This information appears to be wrong for your year range. you probably actually have single wire door pin switches?

[rjdrew1986]

Thank you for responding. I do see in the schematics where each door has (2) door jam ground inputs to each door's respective DDM. I think since (when the issue occurs) none of the (4) doors will shut off the RAP, it's maybe not attributed to a door jam ground on any particular door? I also am not clear on which tasks are linked to each ground wire, I've come to the 'assumption' that (1) ground is for door ajar & Rap control and the other is for lights but that may or may not be correct. I'm thinking if the RAP fails to shut off with the opening of all (4) doors, the likely suspect is the BCM? I did find one post where the GM Tech felt there was something 'unique' with the Driver's door DDM in that it could somehow cause the RAP to not shut off with all (4) doors. But I'm not sure, each DDM 'seems' to be (4) equally paralleled serial data inputs into the BCM. Perhaps someone has a deeper understanding of this area of the BCM functional details and can shed some light. The BCMs & Drivers DM are inexpensive enough on Ebay that I ordered one of each to try. Does anyone know for sure if the P04 checks for a VIN match with the BCM? A member much more knowledgeable than me thinks the P04 pre-dated the VIN check.

[ironduke]

Thank you for responding. I do see in the schematics where each door has (2) door jam ground inputs to each door's respective DDM. I think since (when the issue occurs) none of the (4) doors will shut off the RAP, it's maybe not attributed to a door jam ground on any particular door? I also am not clear on which tasks are linked to each ground wire, I've come to the 'assumption' that (1) ground is for door ajar & Rap control and the other is for lights but that may or may not be correct. I'm thinking if the RAP fails to shut off with the opening of all (4) doors, the likely suspect is the BCM? I did find one post where the GM Tech felt there was something 'unique' with the Driver's door DDM in that it could somehow cause the RAP to not shut off with all (4) doors. But I'm not sure, each DDM 'seems' to be (4) equally paralleled serial data inputs into the BCM. Perhaps someone has a deeper understanding of this area of the BCM functional details and can shed some light. The BCMs & Drivers DM are inexpensive enough on Ebay that I ordered one of each to try. Does anyone know for sure if the P04 checks for a VIN match with the BCM? A member much more knowledgeable than me thinks the P04 pre-dated the VIN check.

Fairly certain the drivers door is the only one that kills rap.. If there are 2 different circuits going to the ddm for door ajar than I would guess your latch is somewhat faulty and not always pulling one of those circuits to ground. Fairly easy to check with the door panel off for testing.

What's your year, make, and model?

[rjdrew1986]

Thanks for your help. I stand corrected, I just confirmed that you are correct and it is just the drivers door. I have the schematic and I will test the Jam switch. Sorry to bother you with such a small issue. Take Care.