Question about 1992 Pontiac Bonneville

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A/c clutch relay not getting signal from wire going to pcm.jump relay works fine. repl.a/c switch in dash a year ago

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Check freon pressure while running on low side. Low pressure will cause compressor not to engage.

Posted on May 15, 2010

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Posted on Jan 02, 2017

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1992 Fleetwood P30 motorhome I change the fuel pump it was working and then all of a sudden all my power to my dash lights went out I jumped solenoid and got power back to my dashboard now my fuel


You need an electrician. He will probably need a wiring diagram to figure out what circuit has the malfunction. Have you checked to make sure the fuel pump fuse has not blown?
By jumping the solenoid, do you mean you bypassed it? I don't even know what solenoid you are referring to.
The pump circuit, if like other GM vehicles of those years, probably has a fuel pump relay (under the hood) and a fuel pump fuse- probably a 15 amp blue fuse, could be under the hood or under the dash. If you check all fuses, then find the pump relay, now you can check there for power available to the relay. The pcm is what signals this relay on. Does your pcm have power? Does your check engine light come on when you turn the key to ON?

Dec 24, 2016 | Cars & Trucks

1 Answer

Compressor clutch engages when I jump the relay, and I already bought a new relay. What could be preventing the compressor from recording power.


The compressor from recording power ? First off what make , model an year vehicle ? When you jump the pins where the relay plugs into , By the way that should be pin's 30 & 87 .look on the bottom of the relay .Besides 30 & 87 you will also see pin's 85 & 86 ! 85 ,86 are the control side . When you push the A/C button on the control head ,depending on make , model an year vehicle , the control head sends a turn on request to the BCM - body control module or right to the PCM - engine computer .The PCM will then energize the compressor clutch relay ! Is there control from PCM ? Before the the relay will be energized the PCM looks for a signal from high an low pressure cut out switches . Your best bet would be to take your vehicle to a qualified repair shop .

Aug 05, 2016 | Cars & Trucks

1 Answer

Where is starter cable under dash of 2000 Buick lesabre


There is no starter cable under the dash ! there is a small gage wire that goes from the ignition switch to the PCM - engine computer . When turning the key to the start position a small amount of voltage to the PCM is a signal for it to energize the start 1 relay in the under hood fuse/relay box . At the ignition switch ,connector 2 , pin B a yellow wire is this discrete voltage signal to the PCM .At the PCM this wire is at Connector-2 pin 23 . You can check for continuity with an ohm meter . Do you know what a relay is , find the start 1 relay in the under hood fuse/relay center ! You can test for power an control of the starter motor circuit ! VEHICLE RELAYS Operation Diagnosis If you had a professional grade scan tool you could view the ignition switch input to the PCM an energize the start relay in the special functions of the scan tool .

Sep 29, 2015 | Buick Cars & Trucks

1 Answer

2001 chevrolet suburban compressor dosent come on. No ground signal on a/c relay 85


The compressor clutch relay is grounded by the PCM.
The computer gets signals from the high and low pressure switches along with input from the main control on the dash.
You may need a shop manual to get the wiring diagrams and test procedures to find the problem.

Feb 27, 2013 | 1994 Chevrolet Suburban

1 Answer

No power to AC clutch 1994 olds cutlass ciera 3.1 litre


Have you tired jumping the AC compressor low pressure switch?

May 25, 2012 | 1994 Oldsmobile Cutlass Ciera

1 Answer

What energizes ac relay on 2005 freestar


The low side pressure switch in the AC low pressure line signals the PCM (computer control) to close the AC compressor relay and raise the idle speed. If the system is low on refrigerant charge the relay will not allow the system to engage the compressor, this is because the oil that lubricates all the works is suspended in the AC refrigerant, if that is low then the system gets no lubrication and will quickly seize up..

Mar 23, 2012 | 2005 Ford Freestar

1 Answer

Jumped the relay and compressor came on and system charged it was blowing cold. When I put relay back in the compressor will not come on. I swapped relays and still nothing. But every time I jump it it...


So the relay coil is not being energized. You will need to determine why. It could be the ground signal from the PCM, which is effected by the control panel A/C switch or else it is the positive signal from the 10 amp CRUISE fuse, which must pass thru the pressure switches (high and low). First check the fuse. If the fuse is good, use a 12 volt test light to probe the relay socket to see which signal is not getting to the relay. Connect your test light clip to chassis ground, start the car, turn the A/C on, and probe the relay socket. There should be 2 hot terminals in the socket--one from the 10 amp compressor fuse, which you have been using to power the clutch, and one from the pressure switches. If you don't get this second hot terminal, try jumping each pressure switch connector one at a time to see which one is not closing. If you DO get both hot signals, the problem is the signal from the PCM. Move your test light clip to battery positive and probe the relay socket again. If the negative signal is absent from the relay socket, only the clutch terminal will show any voltage. If this is the case, you will first need to check the continuity of the wire (dark green with a white stripe) from the PMC connector 2 pin 47 to the relay socket. If the wire is good, the problem may be in the control panel. If you get this far and/or you get stuck along the way, please get back to me.

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Jul 24, 2011 | 2001 Cadillac DeVille

1 Answer

The a/c clutch wont engage


Did you try jumping where the Clutch relay plugs into the fuse/relay box ? Pin 87 & 30 are the compressor clutch coil power supply . If you look on the bottom of the relay you will see four set's of numbers 30 & 87 , 85 & 86 . If you take a piece of wire an jump 30 to 87 this will send B+ voltage to the clutch coil engaging the compressor . Is the PCM turning on the relay ?
The Trainer 40 When the compressor won compress

Jul 29, 2017 | 1998 Chrysler Town & Country

3 Answers

Put in a new dash control panel,new pressure switch,full of freon.fuses and relays are good. jumped low pressure switch.still no power to ac clutch. HELP..


YOUR a/c compressor is cut on by the vehicle pcm(computer).pcm sends a signal to a/c relay to energize relay which sends power to compressor. Have you checke dall the fuses with a test light? last dodge i worked on had a blown horn fuse which powered a/c system also. block said nothing about this. here is a diagram999f7d5.gif

May 21, 2010 | 2003 Jeep Liberty

2 Answers

89 wrangler


there should be a sloenoid on the firewall it could be bad

Aug 26, 2008 | 1989 Jeep Wrangler

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