GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2006 🢒 GTO 🢒 Accessories 🢒 Cruise Control 🢒 Cruise Control Inoperative/Malfunctioning

Test Description

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

  1. This step inspects the cruise control switch and associated circuits.

    2.

  2. This step inspects the brake pedal switch assembly and associated circuits.

    3.

  3. This step inspects the clutch pedal switch assembly and associated circuits.

    4.

  4. This step inspects for a fault in the cruise switch ON/OFF circuit between the switch and the powertrain interface module (PIM).

    5.

  5. This step inspects for a fault in the cruise switch RESUME/ACCEL circuit between the switch and the PIM.

    6.

  6. This step inspects for a fault in the cruise switch SET/DECEL circuit between the switch and the PIM.

    7.

  7. This step inspects for a fault in the stop lamp switch (switch C) circuit between the switch and the engine control module (ECM).

    8.

  8. This step inspects for a fault in the stop lamp switch (switch A) circuit between the switch and the ECM.

  9. This step inspects for a fault in the cruise control disengage clutch switch circuit between the switch and the ECM.

    10.

  10. This step inspects for a fault in the engine start clutch switch circuit between the switch and the ECM.

    11.

  11. This step inspects for intermittent faults in associated circuits and connectors.

Step

Action

Yes

No

Schematic Reference: Cruise Control Schematics

DEFINITION: This diagnostic table is used to diagnose the cruise control system when the system is malfunctioning or inoperative.

1

Did you review the Cruise Control System Description and Operation?

Go to Step 2

Go to Cruise Control Description and Operation

2

  1. Connect the scan tool to the vehicle.
  2. Navigate to the Miscellaneous Tests within the Powertrain Interface Module (PIM) section of the scan tool.
  3. While monitoring the scan tool, press the cruise control switch ON/OFF button.

Does the scan tool display Active and Inactive as the cruise control switch is toggled?

Go to Step 3

Go to Step 9

3

While monitoring the scan tool, rotate the cruise control switch from rest to REC-ACCEL.

Does the scan tool display Active and Inactive as the cruise control switch is toggled?

Go to Step 4

Go to Step 10

4

While monitoring the scan tool, rotate the cruise control switch from rest to SET-DECEL.

Does the scan tool display Active and Inactive as the cruise control switch is toggled?

Go to Step 5

Go to Step 11

5

  1. Turn the ignition to OFF.
  2. Disconnect the engine control module (ECM) wiring harness connector.
  3. Turn the ignition to ON.
  4. Using a multimeter, measure the voltage of the stop lamp switch (switch C) circuit at the ECM harness connector and ground.
  5. With the aid of an assistant, monitor the voltage on the multimeter and press and release the brake pedal.
    6. •  With the brake pedal in the rest position, the multimeter should display battery voltage.
    • With the brake pedal pressed, the multimeter should display 0 volts.

Does the multimeter display as described?

Go to Step 6

Go to Step 12

6
  1. Using a multimeter, measure the voltage of the stop lamp switch (switch A) circuit at the ECM harness connector and ground.
  2. With the aid of an assistant, monitor the voltage on the multimeter and press and release the brake pedal.
    3. •  With the brake pedal in the rest position, the multimeter should display 0 volts.
    • With the brake pedal pressed, the multimeter should display battery voltage.

Does the multimeter display as described?

Go to Step 7

Go to Step 13

7

If the vehicle has an automatic transmission, go to Step 19.

  1. Using a multimeter, measure the voltage of the cruise control disengage clutch pedal switch circuit at the ECM harness connector and ground.
  2. With the aid of an assistant, monitor the voltage on the multimeter and press and release the clutch pedal.
    3. •  With the clutch pedal in the rest position, the multimeter should display battery voltage.
    • With the clutch pedal pressed, the multimeter should display 0 volts.

Does the multimeter display as described?

Go to Step 8

Go to Step 14

8
  1. Using a multimeter, measure the voltage of the engine start clutch pedal switch circuit at the ECM harness connector and ground.
  2. With the aid of an assistant, monitor the voltage on the multimeter and press and release the clutch pedal.
    3. •  With the clutch pedal in the rest position, the multimeter should display 0 volts.
    • With the clutch pedal pressed, the multimeter should display battery voltage.

Does the multimeter display as described?

Go to Step 16

Go to Step 15

9

Inspect the cruise ON/OFF circuit between the cruise control switch and the PIM for loose or damaged connections, an open circuit, or a short to ground.

Did you find and correct the condition?

Go to Step 17

Go to Step 20

10

Inspect the cruise RESUME/ACCEL circuit between the cruise control switch and the PIM for loose or damaged connections, an open circuit or a short to ground.

Did you find and correct the condition?

Go to Step 17

Go to Step 20

11

Inspect the cruise SET/DECEL circuit between the cruise control switch and the PIM for loose or damaged connections, an open circuit, or a short to ground.

Did you find and correct the condition?

Go to Step 17

Go to Step 20

12

  1. Inspect fuse F15. If blown, inspect for a short to ground in that circuit.
  2. Inspect the stop lamp switch (switch C) circuit between the switch and the ECM for loose or damaged connections, an open circuit, or a short to battery.

Did you find and correct the condition?

Go to Step 18

Go to Step 21

13

  1. Inspect fuse F5. If blown, inspect for a short to ground in that circuit.
  2. Inspect the stop lamp switch (switch A) circuit between the switch and the ECM for loose or damaged connections, an open circuit, or a short to battery.

Did you find and correct the condition?

Go to Step 18

Go to Step 21

14

  1. Inspect fuse F15. If blown, inspect for a short to ground in that circuit.
  2. Inspect the cruise control disengage clutch switch circuit between the switch and the ECM for loose or damaged connections, an open circuit, or a short to battery.

Did you find and correct the condition?

Go to Step 19

Go to Step 21

15

  1. Inspect fuse F33. If blown, inspect for a short to ground in that circuit.
  2. Inspect the engine start clutch switch circuit between the switch and the ECM for loose or damaged connections, an open circuit, or a short to battery.

Did you find and correct the condition?

Go to Step 19

Go to Step 21

16

Inspect all associated circuits and connectors for an intermittent condition.

Did you find and correct the condition?

Go to Step 22

Go to Step 23

17

Repair or replace the cruise control switch and associated circuits as required. Refer to Turn Signal Multifunction Switch Replacement .

Did you complete the repair?

Go to Step 23

 

18

Repair or replace the affected brake pedal switch assembly circuit.

Did you complete the repair?

Go to Step 23

 

19

Repair or replace the affected clutch pedal switch assembly circuit.

Did you complete the repair?

Go to Step 23

 

20

Replace the PIM.

Did you complete the repair?

Go to Step 23

 

21

Replace the ECM.

Did you complete the repair?

Go to Step 23

 

22

Repair the intermittent fault as required.

Did you complete the repair?

Go to Step 23

 

23

Operate the system in order to verify the repair.