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CODE TC0063 IS BRAKE PRESSURE MODULATOR VALVE, BPMV, power supply malfunction. Check your right hand maxi fuse block, fifty amp maxi fuse, this powers up the "Electronic Brake and Traction Control Module", EBTCM, the ebtcm and bpmv, are connected together on the frame under the air box. If the maxi fuse is good and the EBTCM is getting power their is a relay inside it which powers up the valves inside the BPMV . Code sixty three sets with an open in the valve power circuit , a faulty valve relay or if the bpmv becomes damaged. If the maxi fuse checks out good I could give you the diagnostic chart but use of a breakout box is required, you may want to defer to the dealer. These two units are non serviceable. They had a lot of trouble with the EBTCM in this year of car. Remember as long as your dash light is on , you do not have low gear when you take off, the computer defaults , to second gear as long as the light is on.
CODE AC1312 AC HIGH SIDE TEMP CIRCUIT OPEN Most likely a bad or obstructed temp sensor. It is located on center of firewall on AC high side line. Check connector for corrosion. Check wires for breaks.
Shawn
Right side of the engine compartment on fenderwell. You're looking for MAXI(Large)fuse #5. Should be 50amp.
Sorry, should have told you that.
I would say that if there is power th the EBTCM and the fuse is good that it is highly likely one of the two are bad. At the price for the two you may want Cadillac to check which is the problem. Chance the relay in the EBTCM is bad.
Here is the description of code 63 and the diagnostic charts if you want to check for power.
... ANTI-LOCK BRAKE SYSTEM & TRACTION CONTROL -1995 Cadil Page 1 of 1
DTC 63 - BPM VALVE POWER SUPPLY FAULT
Valve relay provides power to ABS and TCS valve solenoids in the BPM valve. Valve relay is located in the EBTCM, and is activated whenever ignition is on and no faults are present. Power is provided to the valves through the relay from circuit No. 1042 connected to terminal No. 3 of the EBTCM. Valve relay remains engaged until ignition is turned off or a failure is detected.
DTC 63 can set with an open in the valve power circuit, faulty valve relay, or damaged BPM valve.
NOTE: Test numbers refer to numbers on diagnostic chart.
1.Checks for proper voltage to valve. 2.Checks for open in one or more of the individual valve power leads or the main lead to all the valves within the BPM.
Fig. 64: DTC 63 Schematic Courtesy of GENERAL MOTORS CORP.
Fig. 65: DTC 63 Flow Chart Courtesy of GENERAL MOTORS CORP.
If the AC is functioning properly I'd say it will be fine. I would still check the connector and wires to make sure there isn't a bad connection or bad wire.
ASE Certified Technician
PA Certified Inspection emissions, ASE Brakes Suspension, Lead diagnostic Tech.20 years exp