GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Catera 🢒 Body and Accessories 🢒 Cruise Control 🢒 Cruise Control Does Not Disengage with Brake Pedal

Step

Action

Value(s)

Yes

No

DEFINITION: Cruise control does not disengage after pressing and releasing the brake pedal or when the Off switch is pressed and released at the stalk mounted lever.

1

Did you perform the Cruise Control System Check?

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Go to Step 2

Go to Cruise Control System Check

2
  1. Install a scan tool.
  2. Establish communications with the engine control module (ECM).
  3. Select DTC information.

Is a DTC P0571 set as current?

--

Go to Step 3

Go to Step 4

3

Refer to the Engine Controls section to repair this DTC.

Is the repair complete?

--

Go to Cruise Control System Check

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4
  1. Ignition ON, with the engine OFF.
  2. With the scan tool, observe the CRUISE SWITCH parameter in the ECM data list.
  3. Press the OFF button at the end of the lever.

Does the scan tool display OFF?

--

Go to Step 5

Go to Step 6

5
  1. Observe the BRAKE LIGHT SWITCH parameter.
  2. Apply the brake pedal.

Does the scan tool display APPLIED?

--

Go to Step 7

Go to Step 8

6
  1. Turn OFF the ignition.
  2. Disconnect ECM connector C2.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage at ECM connector C2 terminal 42 with the OFF button at the end of the lever pressed.

Does the voltage measure within the specified range?

10-12 V

Go to Step 7

Go to Step 9

7

Replace the ECM.

Is the replacement complete?

--

Go to Step 10

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8

Verify that the brake lamps illuminate when applying the brake pedal.

Do the brake lamps illuminate when applying the brake pedal?

--

Go to Step 11

Go to Step 12

9

Test CKT FA300 for an open circuit.

Did you find and correct the condition?

--

Go to Step 10

Go to Step 14

10

Verify that the cruise control operates properly.

Does the cruise control operate properly?

--

Go to Cruise Control System Check

--

11
  1. Disconnect ECM connector C2.
  2. Measure the voltage at terminal 27 with the brake pedal applied.

Does the voltage measure near the specified value?

10-12 V

Go to Step 7

Go to Step 13

12

Test the following components or circuits for proper operation:

    • inspect the HZD fuse
    • stop lamp signal circuit for an open
    • stop lamp switch

Did you find and correct any of the above conditions?

--

Go to Step 10

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13

Test CKT FB500 for an open circuit.

Did you find and correct the condition?

--

Go to Step 10

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14

Replace the cruise control switch.

Is the replacement complete?

--

Go to Step 10

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