Question about 1997 Mercury Grand Marquis

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Cruise Control How to remove old deactivication swtch.

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Voltage from the brake light switch deactivates the cruise control . Have an assistant press on the brake pedal while you check that the brake lights are working properly. Brake lights that dont come on or dont shut off need to be fixed and go from there. Sorry if this doesnt answer you question but I thought i would give it a try.

Posted on Feb 28, 2014

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1 Answer

2002 f150 cruise inop shows code 3?


  • 3 flashes - deactivator switch is open or circuit defective.
    • Flash code 3 - deactivator switch circuit failure
    • Central junction box (CJB) fuse 13 (20A).
    • Circuitry.
    • Deactivator switch.
    • Speed control servo.
    • Go To Pinpoint Test H .
    PINPOINT TEST H: FLASH CODE 3 - DEACTIVATOR SWITCH CIRCUIT FAILURE
  • CONDITIONS DETAILS/RESULTS/ACTIONS H1 CHECK THE DEACTIVATOR SWITCH CIRCUITRY
    Speed Control Servo C122
    Measure the voltage between the speed control servo C122 pin 9, circuit 307 (BK/YE), harness side and the speed control servo C122 pin 10, circuit 57 (BK), harness side.
    • Is the voltage greater than 10 volts?
    Yes INSTALL a new speed control servo. REFER to Speed Control Servo in this section. REPEAT the self-test.

    No GO to H2 . H2 CHECK DEACTIVATOR SWITCH POWER
    Deactivator Switch C1025
    Measure the voltage between the deactivator switch C1025, circuit 10 (LG/RD), harness side and ground.
    • Is the voltage greater than 10 volts?
    Yes GO to H3 .

    No REPAIR the circuit. REPEAT the self-test. H3 CHECK CIRCUIT 307 (BK/YE) FOR AN OPEN Measure the resistance between the speed control servo C122 pin 9, circuit 307 (BK/YE), harness side and the deactivator switch C1025, circuit 307 (BK/YE), harness side.
    • Is the resistance less than 5 ohms?
    Yes INSTALL a new deactivator switch. REFER to Speed Control Deactivator Switch in this section. REPEAT the self-test.

    No REPAIR the circuit. REPEAT the self-test.

Nov 23, 2016 | 2002 Ford F-150

1 Answer

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No coincidence Pal. That cutout switch is part of the brake light switch and is easy to replace. It just screws into a bracket at the brake pedal lever and has a jamb nut on it to lock in position. Just get one from a parts store and replace it yourself.

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Once you have turned your cruise control on accelerate to desired speed press SET button on right hand side of steering wheel before lifting foot from accelerator, then remove foot from accelerator. pushing RESUME button will deactivate cruise control without turning it off. Then when clear of traffic push resume again to activate cruise control. It will automatically resume to previous set speed.

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1 Answer

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1 Answer

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Hello carrollrll,

Fix the third brake light and that should resolve the cruise control issue.

The cruise control circuit that deactivates the cruise is through the third brake light.

Regards,
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1 Answer

The cruise control light flashes and can not be activated


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I have a 2004 grand prix gt and my cruise control wont come on and i cant dissable the trac control system with the button on my center console. either that or the DIC just isnt displaying that its been...


i have a 2004 grand prix gt and my cruise control wont come on and i cant dissable the trac control system with the button on my center console. either that or the DIC just isnt displaying that its been deactivated.

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1 Answer

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My 1999 Jag XJ8 did the same thing when the cruise control was activated (red button by the gear shift), but I wasn't actually using the cruise control. I deactivated the cruise control and the fail safe message no longer appears.

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1 Answer

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