GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2003 🢒 ION 🢒 Body and Accessories 🢒 Cruise Control 🢒 Cruise Control Inoperative/Malfunctioning

Diagnostic Aids

Caution: Refer to SIR Caution in the Preface section.

Important: Perform the following in order to avoid misdiagnosis.

  1. Inspect for proper operation of brake lamps.
  2. Inspect throttle linkage for mechanical binding which could cause the system to malfunction.
  3. Inspect cruise control cable adjustment, should have minimum slack.
  4. When testing vehicles equipped with steering wheel controls, the steering wheel must be rotated to each stop position while testing the cruise control switch signal circuits. This will ensure the integrity of the SIR coil.

Disable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling in SIR.

    • Ensure that the following cruise control switches are not stuck in the engaged position:
       - On/off switch
       - Set/coast switch
       - Resume/accel switch
    • With a scan tool, observe the associated cruise control switch parameter in the Powertrain Cruise Control Data list, while rotating the steering wheel to both steering stops and separately activating each cruise control switch. This will help eliminate the possibility of an internally shorted inflatable restraint steering wheel module coil.
    • EMI on the speed sensor signal circuit may cause erratic cruise control operation.
    • For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Conditions for Enabling Cruise Control
    • When vehicle speed is more than 40 km/h (25 mph)
    • When PARK, REVERSE, NEUTRAL, or 1st gear is not indicated
    • When an over/undercharged battery condition does not exist
    • With normal engine RPM
    • Without high engine RPM fuel cut-off

Step

Action

Values

Yes

No

Schematic Reference: Cruise Control Schematics

Connector End View Reference: Cruise Control Connector End Views or Engine Control Module Connector End Views in Engine Controls - 2.2L (L61)

1

Did you perform the Cruise Control Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Cruise Control

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn the cruise control On/Off switch OFF.
  4. With the scan tool, observe the following cruise control parameters in the engine control module (ECM) Data, data list:
    5. • Cruise On/Off Switch
    • Cruise Resume/Accel Switch
    • Cruise Set/Coast Switch

Do all of the parameters listed above display Off?

--

Go to Step 3

Go to Step 6

3
  1. With the scan tool, observe the Cruise On/Off Switch parameter.
  2. Turn the cruise On/Off switch ON.

Does the Cruise On/Off Switch parameter display On?

--

Go to Step 4

Go to Step 7

4
  1. With the scan tool, observe the Cruise Set/Coast Switch parameter.
  2. Press and hold the set/coast switch.

Does the Cruise Set/Coast Switch parameter display On?

--

Go to Step 5

Go to Step 8

5
  1. With the scan tool, observe the Cruise Resume/Accel Switch parameter.
  2. Press and hold the resume/accel switch.

Does the Cruise Resume/Accel Switch parameter display On?

--

Go to Diagnosic Aids

Go to Step 8

6
  1. Turn OFF the ignition.
  2. Remove the inflatable steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  3. Disconnect the cruise control switch.
  4. Turn ON the ignition, with the engine OFF.
  5. Observe the Cruise On/Off Switch parameter in the Cruise Control Data, data list.

Does the Cruise On/Off Switch parameter display Off?

--

Go to Step 12

Go to Step 10

7
  1. Turn OFF the ignition.
  2. Remove the inflatable steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  3. Disconnect the cruise control switch.
  4. Turn ON the ignition, with the engine OFF.
  5. Connect a test lamp between the ignition 1 voltage circuit and a good ground.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 14

8

Important: The cruise control on/off switch must be turned ON in order to correctly view the set/coast switch and the resume/accel switch resistance values.

  1. Turn OFF the ignition.
  2. Remove the inflatable steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  3. Disconnect the cruise control switch.
  4. Turn ON the ignition, with the engine OFF.
  5. With a DMM, measure the resistance of the cruise control switch between the ignition 1 voltage circuit and the cruise control set/coast and resume/accelerate switch signal circuit.
  6. Individually activate and hold the cruise control function switches.

Do the resistance values measure at the specified values?

Off = O.L.

On = 7.8K - 8.6K

Resume = 2.7K - 3Kohms

Set = 1.2K - 1.3Kohms

Go to Step 11

Go to Step 12

9

Important: The cruise control on/off switch must be turned ON in order to correctly view the set/coast switch and the resume/accel switch resistance values.

  1. With a DMM, measure the resistance of the cruise control switch between the ignition 1 voltage circuit and the cruise control set/coast and resume/accelerate switch signal circuit.
  2. Individually activate and hold the cruise control function switches.

Do the resistance values measure at the specified values?

Off = O.L.

On = 7.8K - 8.6Kohms

Resume = 2.7K -3Kohms

Set = 1.2K - 1.3Kohms

Go to Step 13

Go to Step 12

10

Test the cruise control set/coast and resume/accelerate switch signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 17

Go to Step 13

11

Test the cruise control set/coast and resume/accelerate switch signal circuit for an open, for a short to voltage, for a short to ground, or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 17

Go to Step 13

12

Inspect for poor connections at the harness connector of the cruise control switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 17

Go to Step 15

13

Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 17

Go to Step 16

14

Repair the open, the short to ground, or the high resistance in the ignition 1 voltage circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 17

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15

Replace the cruise control switch. Refer to Cruise Control Switch Replacement .

Did you complete the replacement?

--

Go to Step 17

--

16

Important: Program the replacement ECM.

Replace the ECM. Refer to Engine Control Module Replacement in Engine Controls - 2.2L (L61).

Did you complete the replacement?

--

Go to Step 17

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17
  1. Install the inflatable steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR.
  2. Enable the inflatable restraint steering wheel module. Refer to SIR Disabling and Enabling in SIR.
  3. Operate the vehicle with in the conditions for cruise control operation.

Does the cruise control system operate properly?

--

System OK

Go to Step 2