Justin Case

GMC safari 2003 uses delco computer: p/n 15063578.
There is a cpu IC, and 4 interface ic's with part number:162212.

I am trying to find a schematic of the computer.


The problem is the computer will not ground the coil of the courtesy light relay so the lights never come on.
I have had a OBDII read with no errors or problems displayed.

I do not need a wiring diagram of outside the computer, I have that, I need a diagram of the computer itself.

Is that too technical a question to ask?

wssix99

iTrader: (5)

Great question. If anyone knows where to get these things, I'd be interested to know...

TexasNative

Are there any marks on the IC breadboard that might identify the mfr?

Justin Case

IC markings:


Driver IC's:

16221256-274
16-pin DIP
------------------------

Microcontroller:

12201293
990 S1116011PJ
(C) 1998 TI
F24-17A65LW

PLCC 100-pins, smt
(30-across , 20-down)
---------------
Resistor array (possibly)
14-pin DIP smt

16245813
CTS0119
epoxy is pastel green
---------------
PCB bar code sticker:
B0 19ZHF
(actual bar code not decoded to verify above)
--------------
PCB ARTWORK:

PCB Rev. 35C546 P5 (etched)

E (logo) WAS934 69 (etched)
NM4 94V-0
(this i probably the PCB warehouse mfg'r)

35D546 P7
-or- (silkscreened)
350546 P7

logo: looks like lemon on it's side with cystic fibrosis "knot" inside
-----------------------

Does anyone have a patent number for this computer??

The CPU's software is copyrighted 1998, so likely patented '98 or when ODBII was introduced, maybe a year prior.
Copyright date also tells roughly when assembled, but certainly not before this date.

I have photos....

TexasNative

You've got a tough one there. We have access to quite an extensive database of these types of things and all I could find after a week and a half of searching here and there was information with IEEE stating that the processor was contracted out to GM and Saturn around that time. There are no schematics for this thing to be found anywhere. Do you have a 12v output anywhere on the board that could be used to trigger a relay to switch your ground circuit for you?

Justin Case

Yes I could put in a bypass switch to ground the relay as the driver chip is open collector output. Wanted to fix it if possible so it was automatic.

Btw, i found the driver chip part number equiv. so i mapped inputs to outputs and it is the microcontroller that is not sending the correct signal to the driver chip. I checked all my switches and everything is connected and levels toggle.

Does anyone know if there is a programable software option to disable the courtesy light relay (like the DRL is an option). Sounds silly but you never know.

I was told my computer Cannot be flashed, is that true???

If thats true, I need a replacement computer !!

TexasNative

I think you're correct in assuming you can't program as I don't there is any type of NVRAM or EEPROM on board. You might be able to use an output from the BCM to do the job. You could also consider reversing the circuit so that the relay switches a 12v signal instead of a ground. Just isolate the offending circuit, give it a permanent ground and be done. Otherwise looks like you might need to replace the computer (or replace just the faulting chip if you're so inclined) if you want it to work as the factory intended.

TexasNative

Actually, looks like that IS the BCM you have. Found one for $123.00 here:

http://www.automotix.net/usedautopar...vlf89145u.html

Justin Case

Isn't DRL option something the dealership can enable/disable for US vs CDN versions?
If that can be changed then it has NVRAM (all current micro's do actually).
Also, the passlock system requires NVRAM or it would have to relearn everytime the battery dies.

The driver chip I tested, works good.
I need to find a device to do a detailed (dealer) read.

TexasNative

You may be right in thinking that it can be programmed as I can't say that i'm no expert in the field but I was under the impression that the BCM wasn't programmable and that the chip has the instruction set burned in negating the need for NVRAM. Some features like VATS (and possibly DRL on/off) are programmed via the PCM so that's the assumption I was going under. If you do find a way to program the BCM I would definitely be interested to know myself as there are quite a few things I would like to change in some of my own vehicles. Sorry I couldn't be more help but best of luck to you and look forward to your results.