ABS problem. 98 STS
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Suspension, Brakes and Tires Discussion, ABS problem. 98 STS in Item Specific Cadillac Discussion; I have been getting a code "C1242 - Pump Motor Circuit Open" It comes on randomly and when i clear ...
  1. #1
    jcdsog is offline Cadillac Owners Member
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    ABS problem. 98 STS

    I have been getting a code "C1242 - Pump Motor Circuit Open" It comes on randomly and when i clear it it stays off for a while normally. I was wonderin where this problem could be originating. I read in another forum that it could be a bad wire or harness. I have located the brake valves in the lower part of the engine compartment and will check the connections there. I was wondering where the other side of the harness will plug into. An ABS control module i would imagine.

    Whats weird is that it only started coming on after i had my tires balanced. Im thinking a wire may have been pinched because of that. Does anyone know if the wires are ran under the car or throught the firewall and inside?

    Thanks for all the help.

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  3. #2
    Krashed989's Avatar
    Krashed989 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 Eldorado, and a 99 ETC
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    Re: ABS problem. 98 STS

    What you found was the EBTCM (Electronic Brake and Traction Control Module). It serves both purposes of ABS module and TCS module (mainly because they both need data from the same sensors). Built into the EBTCM is the ABS pump, which obviously from the code definition has an open circut. The wires that go into the EBTCM can be followed going underneath the fuse box and then into the firewall to the IPC module, but a lot of them split off and go to sensors such as the wheel speed sensors. Wiring problems are a bit tricky to diagnose. So get your voltmeter and ohmmeter fired up. Good luck.

    Hope this helps.

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