Question about 1994 Pontiac Bonneville
A couple of ways to check and see if the computer is ok first:
check engine light must come onwith they in on position
The fuel pump must run for two (2) seconds with the key ON
There must be a 5 volt reference at sensors like map, TPS
Must communicate with scan tool
The ORANGE wires at the computer are you power input wires one has 12V all the time this is your KEEP ALIVE MEMORY
one is 12 with the Key on you MUAT HAVE VOLTAGE AT BOTH
Check the computers Ground most are out under the hood and are brown wires
Try the GM TAP TEST this is a factory authorized test with the computer connected and you verified all of the above SLAP the computer with the open hand firmly not too hard but firm see if anything changes,
Do not disconnect the battery you will erase all the codes!
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Posted on Aug 14, 2008
Lars, Unfortunately what you have is NEITHER an OBDI or OBDII. You have what TSB's refer to as an OBDI.5 (or one and a half). This is frustrating in that---What is normally a simple task --(retrieving trouble codes) IS an IMPOSSIBILITY on these 1995 GM vehicles.
This 'impossibility' is due to the fact that these [1995 vehicles] LACK a Ground pin (the pin designated as the "B" pin in your data link connector.) To know if your vehicle is [indeed] one of these not [D.I.Y] code-able cars all you have to do is take a look.
And by that, I mean you need to [literally] LOOK into the access link connector. Look [specifically] at the upper right side of the connector and check if you have both of those[last two] pins in your connector. Most likely you will discover your vehicle lacks the "B" [ground] pin/terminal. This pin is absolutely necessary to code retrieval (even with a scantool). Try this before you go to all the other trouble of searching for a blown fuse or a short or heaven forbid go and waste your hard-earned money purchasing a new/remanufactured pcm/ecm that you didnt/dont actually need!
Unfortunately if you have a car with this singularity...The dealership is nearly your only option to acess your vehicles trouble codes.
Sep 03, 2013
Posted on Sep 03, 2013
The paperclip test wont work on the OBD2.. tried it many times. i've read at other places that they're replaced all the sensors, fuel filter and even took them to the pontiac dealers. the dealers say there's nothing wrong with them. i've been having this problem for about 2 months now. still can't find the answer
Posted on Aug 30, 2008
Use the paper clip trick insert one end in the a slot and the other in the b count the flashes one plus a hesitatation followed by two quick flashes indicate a code twelve etc. each trbl code will flash three times and cycle to the next just keep track until they repeat then you know you have all the trbl codes
Posted on Aug 14, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
Class 2 serial data received from other control modules connected to the class 2 serial data link.
The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link. The control module capable of performing the required function will respond to the BCM message.
You best bet is to take it the dealer or a ASE certified repair shop !
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