GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2004 🢒 GTO 🢒 Accessories 🢒 Cruise Control 🢒 Cruise Control Self Diagnostic Test

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step triggers the diagnostic self test. The ON-OFF pushbutton must be held until Step 6.

  2. This step tests the SET-DECEL function of the cruise control switch assembly.

    3.

  3. This step tests the RES-ACCEL function of the cruise control switch assembly.

    4.

  4. This step tests the cruise control electrical release switch (switch B).

    5.

  5. This step tests the clutch pedal release switch. This is included for vehicles with manual transmissions. If the vehicle is fitted with an automatic transmission, then the brake pedal must be pressed and released as in the previous step to enable the completion of the switch diagnostic tests.

    6.

  6. This step triggers the second stage of the diagnostic self test and tests the cruise control ON-OFF switch, the cruise control indicators, and tests the stop lamp switch (switch A) and cruise control switch inputs to the cruise control module.

    7.

  7. This step triggers the final stage of the diagnostic self test, allowing the vehicle to be road tested without having to hold the cruise control function buttons. This step also tests the operation of the cruise control stepper motor and cable. During this test, the stepper motor should cycle and return to the rest position (closed throttle).

    8.

  8. This step checks the speed sender input to the cruise control module. The cruise ACTIVE indicator will flash with the vehicle speed signal.

    9.

  9. This step ends the cruise control diagnostic mode.

Step

Action

Yes

No

1

  1. With the ignition in the OFF position, press and hold the cruise switch ON-OFF push button.
  2. Turn the ignition ON and wait 5 seconds for the LOW TRAC warning indicator to turn OFF.

Did the CRUISE indicator illuminate?

Go to Step 2

Go to Cruise Control Inoperative/Malfunctioning

2

Rotate and hold the cruise switch in the SET-DECEL position.

Did the cruise ACTIVE indicator illuminate?

Go to Step 3

Go to Cruise Control Inoperative/Malfunctioning

3

  1. Release the SET-DECEL switch.
  2. Rotate and hold the cruise switch in the RES-ACCEL position.

Did the cruise ACTIVE indicator illuminate?

Go to Step 4

Go to Cruise Control Inoperative/Malfunctioning

4

  1. Release the RES-ACCEL switch.
  2. Press and hold the brake pedal.

Did the cruise ACTIVE indicator illuminate?

Go to Step 5

Go to Cruise Control Inoperative/Malfunctioning

5

  1. Release the brake pedal.
  2. Press and hold the clutch pedal, manual transmission, or the brake pedal again.

Did the cruise ACTIVE indicator illuminate?

Go to Step 6

Go to Cruise Control Inoperative/Malfunctioning

6

  1. Release the clutch or brake pedal.
  2. Release the cruise switch ON-OFF push button.
  3. Press and hold the cruise switch ON-OFF push button.
  4. Press and hold the brake pedal while observing the cruise ACTIVE indicator.
  5. Release the brake pedal.
  6. Press and hold the brake pedal again still observing the cruise ACTIVE indicator.
  7. Release the brake pedal.

Did the cruise ACTIVE indicator illuminate each time the brake pedal was pressed?

Go to Step 7

Go to Cruise Control Inoperative/Malfunctioning

7

  1. Release the cruise switch ON-OFF push button. The cruise module will enter the final stage of diagnostics and check the stepper motor and cable.
  2. Observing the stepper motor and cable, the motor will stroke from the rest position (closed throttle) to full throttle and back to the rest position.
  3. After the stepper motor has cycled, press and hold the brake pedal.

Did the cruise control stepper motor cycle?

Go to Step 8

Go to Cruise Control Inoperative/Malfunctioning

8

  1. Holding the brake pedal, start the engine.
  2. Drive the vehicle and monitor the cruise ACTIVE indicator. The ACTIVE indicator will flash with the vehicle speed signal.

Does the cruise ACTIVE indicator flash as the vehicle is driven?

Go to Step 9

Go to Cruise Control Inoperative/Malfunctioning

9

Select PARK or 1st gear and switch the ignition to OFF to end the cruise control diagnostic mode.

Did all cruise control functions operate properly?

System OK

--