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97 Eldorado ESC, 2005 Escalade, 02 TransAm (Firehawk)
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21 Posts
Discussion Starter #1
my fuel door and trunk release dash buttons quit working, same on key fob buttons also, checked fuses and they were fine, 97 Eldo esc, any suggestions?
 

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'98 STS (RIP @ 206,xxx miles)
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4,854 Posts
Valet switch in glove box nust be OFF.
 

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1997 Cadillac STS (BOSE w/AUX In, Massage Seats, URPAS, "Z")
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6,405 Posts
The buttons are attached to the IPC inputs. The IPC sends the signal on the data line to the PZM. PZM has separate outputs for each controlling a relay (for each). The actual supply power is fuse protected so quite a lot of things to go wrong.
Then on the other hand the Valet switch (or Key) disables both these functions so...gues what you should check first?
You can also test the buttons by accessing the IPC inputs menu, and you can test the part after the IPC by accessing the IPC overrides menu.
 

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97 Eldorado ESC, 2005 Escalade, 02 TransAm (Firehawk)
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21 Posts
Discussion Starter #5
Thanks for the information, it was my valet switch.
 

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2006 STS V8 1SF RWD
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6,496 Posts
:yeah: happened to me too. I was opening my gas tank with my debit card for 3 days before I finally figured out what the hell was going on....I bet this happens to A LOT of people.
 

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not anymore 2007 Lexus ES350
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7,705 Posts
it happend to me at first first week of ownership i was like damm dealer sold me a lemon times 2 lol
 

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07 STS, 03 Deville, Past '01' Seville, '96' Deville, '87' Deville, '95' ElDo
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30 Posts
Also there is a manual release cable in the trunk under the mat on the left
 

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'97 Eldorado ETC
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89 Posts
My on dash trunk release doesn't seem to be working. Valet mode isn't on and the fuel door opens with the dash button, but the trunk won't. I've only had it a week and have noticed that the trunk release seems iffy because it'll only work like once a day... twice if i'm lucky
 

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1997 Cadillac STS (BOSE w/AUX In, Massage Seats, URPAS, "Z")
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6,405 Posts
Use your PZM overrides to force the trunk release output ON. This will tell you for sure if you have a issue with the controls or with the actuator.
The trunk release button grounds one input of the IPC. The IPC communicate this to the PZM to turn the trunk release output ON.
So you have to diagnose:
1. The trunk release button
2. The IPC trunk release button input (and the wiring between 1 and 2)
3. The data line between IPC and PZM (but since anything else in your car works that is fine)
4. The PZM output.
5. The trunk release actuator (and the wiring between 4 and 5).
Most likely 5 is your problem but do diagnose 1 to 5.
The IPC trunk release input is IPI01 and is found in the IPC Input Display menu(takes care of 1 and 2).
The PZM trunk release output is S01 and is found in the PZM Override menu (takes care of 5).
You can also monitor the status of the PZM output following the PZO01 in the PZM Outputs menu(takes care of 1-5).

Follow the instructions in this thread for how to access these menus (start reading from "Remember these:").
 
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