Have a Car Question? Ask a Mechanic Online.
I have a 1997 Buick Riviera which I had been previously trying to troubleshoot as a 1999 and am thinking there may be enough difference to find the problems I am having. First, there is no chime when the key is left in the ignition and the door is opened. I have tested that switch lead (Light green at B1 on the block) and with the key out, there is voltage. With the key in, it goes to ground. Next, no matter how I try to engage the electric door locks, they lock and then immediately unlock. I know there are 2 sets of contacts in each door and the courtesy light set works perfectly. I need to learn where (other than tearing the doors apart) I can find a terminal block to test the state of the other switch contacts. I will also need the matching wiring diagram for the related circuits to understand what could be interupting the function of the power door locks. Also, I will need the wiring diagram for the "key-in" detect and chime circuit. The chime does function when the ignition key is turned on.
Hello, I'm Chris. Thanks for visiting Just Answer.
Sorry for the long delay. Many experts have reviewed your question so far, but no one at this time has felt comfortable trying to help. The question may be just to difficult or not informative enough or priced to low.I can try to help as long as you understand this is not my exact field of expertise, but I will give you an honest effort to the best of my ability. If you would like me to try and help, is there anything else you can add to your original post giving me more details. I may not be able to answer all of your concern(s) but possibly some of them.If you do not want me to help you, but would rather go back on the top of the list for all experts to have another look see, just reply and let me know....
Lets start with the diagrams, look them over then lets go from there, once we are both viewing the same thing.
Thanks Chris... these seem to be the relative wiring diagrams for this car. On diagram 57, one thing I see that appears real common to both problems is the RFA module. The diagram notes that it is located right front of rear compt. My guess is that they mean under the rear seat? Other locator notes actually specify under rear seat so that is one question. It seems odd that module would only have 3 connections since I would think it would need constant 12 volts for the receiver portion of the remote door lock system but could it be there's another part to that system? These diagrams may get me back into the car to do some more readings if you could follow up on the above questions. Remember, I do read 12 volts on that "key-in" line with the key out and then to ground when the key is in. It looks like if I ground the dark blue wire at E12 on the RFA with the key out, that should rule out the door switches even if the problem still exists. One other question before I regroup and plan to get back to the vehicle in the morning ..... Do you know where the "chime" actually is in this vehicle? I do not see it shown in the diagrams and the sound I hear (chime) when the key is turned on does not seem to come from the radio. Might there be a second sounding device for the "key-in" warning ?
Many thanks ! Charlie
The RFA is under the rear package shelf accessed from the trunk.
At the RFA the key in output which is powered by the BCM gets grounded when the drivers door is open and the key is in. So the BCM no longer sees a voltage reference signal, it is now gets a ground which tells the BCM to sound the chime.
The chime should be emitting from the BCM/ MALL
Charles we have reached the point where you are asking questions about the car, I just do not know the answers to. If you would like me to throw i n the towel and let another help I can.
Thanks Charlie, Glad I could help with what I could.