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For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC Suburban - 2WD 🢒 Body and Accessories 🢒 Cruise Control 🢒 Cruise Control Inoperative

Cruise Control Inoperative Gasoline

Cruise Control Inoperative

Step

Action

Value(s)

Yes

No

Important: The PCM will inhibit the cruise control:

   • When vehicle speed is less than 40 km/h (25 mph).
   • When the PARK, REVERSE, NEUTRAL, OR 1st gear is indicated by the park/neutral position switch.
   • When an over/undercharged battery condition exists.
   • With low engine RPM.
   • With high engine RPM (fuel cut-off). Refer to Powertrain Control Module Description in Engine Controls for additional information.

1

Was the Cruise Control System Check performed?

--

Go to Step 2

Go to Cruise Control System Check

2
  1. Connect a scan tool.
  2. Turn the ignition switch to the ON position.
  3. Inspect for VCM DTCs.

Are there any DTCs found?

--

Go to Powertrain On Board Diagnostic (OBD) System Check

Go to Step 3

3
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the cruise control module connector.
  3. Connect the J 42958 as specified in the user manual.
  4. Turn the ignition switch to the ON position.
  5. Place the cruise switch in the OFF position.

Are the BRAKE and IGNITION lamps illuminated on the J 42958?

--

Go to Step 5

Go to Step 4

4

Inspect the cruise fuse for an open.

Is the cruise fuse open?

--

Go to Step 32

Go to Step 14

5

Place the cruise control switch in the ON position.

Are the ON/OFF, BRAKE, IGNITION and CRUISE lamps illuminated on the J 42958?

--

Go to Step 6

Go to Step 16

6

Press and hold the set/coast (S/C) switch on the cruise control switch.

Does the SET/COAST lamp illuminate on the J  42958?

--

Go to Step  7

Go to Step 19

7

Press and hold the RES/ACC (R/A) switch on the cruise control switch.

Does the RES/ACC lamp illuminate on the J 42958

--

Go to Step 8

Go to Step 21

8

Press and hold the brake pedal.

Do the BRAKE LIGHTS lamp illuminate and the BRAKE lamp turn off on the J 42958?

--

Go to Step 9

Go to Step 23

9
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the J 42958.
  3. Leave the cruise control module connector disconnected.
  4. Using the J 39200, set to AC voltage and on the Hz scale, connect the cruise control module harness connector terminals K and E.
  5. Turn the ignition switch to the ON position.
  6. Raise and suitably support the vehicle.
  7. Inspect the vehicle speed on the scan tool and inspect the J 39200 while rotating one of the vehicle drive wheels.

Is the frequency within the specified value?

1.11 Hz/mph

Go to Step  10

Go to Powertrain On Board Diagnostic (OBD) System Check

10
  1. Turn the ignition switch to the OFF position.
  2. Reconnect the J 42958.
  3. Turn the ignition switch to the ON position.
  4. Press the INHIBIT OVERRIDE button on the J 42958.
  5. Press the S/C button on the J 42958.

Does the CRUISE ENGAGE lamp illuminate on the J 42958 and the throttle strap extend from the cruise control module with each push of the S/C button?

--

Go to Step 11

Go to Step 46

11

Press the BRAKE button on the J 42958

Does the CRUISE ENGAGE lamp turn off on the J  42958 and the throttle strap extend fully from the cruise control module?

--

Go to Step 12

Go to Step 46

12

Press the R/A button on the J 42958 momentarily.

Does the CRUISE ENGAGE lamp illuminate on the J 42958 and the throttle strap retract into the cruise control module with each push of the R/A button?

--

Go to Step 13

Go to Step 46

13

Press the SPD. UP button on the J 42958 momentarily.

Does the CRUISE ENGAGE lamp remain illuminated on the J 42958 and the throttle strap extend fully from the cruise control module and then retract to it's previous position?

--

Go to Cruise Control Cable Adjustment

Go to Step 46

14
  1. Disconnect the J 42958
  2. Using a test light, connect between the cruise control module connector terminal F and ground.

Does the test light illuminate?

--

Go to Step 15

Go to Step 33

15

Using a test light, connect between the cruise control module connector terminals E and F.

Does the test light illuminate?

--

Go to Step 46

Go to Step 32

16
  1. Disconnect the J 42958.
  2. Using a test light, connect between the cruise control module connector terminal A and ground.

Does the test light illuminate?

--

Go to Step 46

Go to Step 17

17
  1. Disconnect the J 42958.
  2. Using a test light, connect between the cruise control switch connector cruise on/off signal circuit terminal and ground.

Does the test light illuminate?

--

Go to Step 35

Go to Step 18

18

Using a test light, connect between the cruise control switch connector ignition voltage circuit terminal and ground.

Does the test light illuminate?

--

Go to Step 48

Go to Step 36

19
  1. Disconnect the J 42958.
  2. Using a test light, connect between the cruise control module connector terminal B and ground.
  3. Press and hold the set/coast (S/C) switch.

Does the test light illuminate?

--

Go to Step 46

Go to Step 20

20
  1. Using a test light, connect the between cruise control switch connector set/coast signal circuit terminal and ground.
  2. Press and hold the set/coast (S/C) switch.

Does the test light illuminate?

--

Go to Step 37

Go to Step 48

21
  1. Disconnect the J 42958.
  2. Using a test light, connect between the cruise control module connector terminal C and ground.
  3. Press and hold the RES/ACC (R/A) switch.

Does the test light illuminate?

--

Go to Step 46

Go to Step 22

22
  1. Using a test light, connect between the cruise control switch connector RES/ACC signal circuit terminal and ground.
  2. Press and hold the RES/ACC (R/A) switch

Does the test light illuminate

--

Go to Step 38

Go to Step  48

23
  1. Disconnect the J 42958
  2. Using a test light, connect between the cruise control module connector terminal G and ground.
  3. Press and hold the brake pedal.

Does the test light illuminate?

--

Go to Step 26

Go to Step 24

24
  1. Using a test light, connect between the stoplamp switch connector output circuit terminal and ground.
  2. Press and hold the brake pedal.

Does the test light illuminate?

--

Go to Step 39

Go to Step 25

25

Using a test light, connect between the stoplamp switch connector ignition voltage circuit terminal and ground.

Does the test light illuminate?

--

Go to Step  49

Go to Step  40

26
  1. Release the brake pedal.
  2. Using a test light, connect between the cruise control module connector terminal D and ground.

Does the test light illuminate?

--

Go to Step  46

Go to Step  27

27

Using a test light, connect between the brake pedal cruise control release switch connector output circuit terminal and ground.

Does the test light illuminate?

--

Go to Step  29

Go to Step  28

28

Using a test light, connect between the brake pedal cruise control release switch connector ignition voltage circuit terminal and ground.

Does the test light illuminate?

--

Go to Step  50

Go to Step  41

29

Is the vehicle equipped with a manual transmission?

--

Go to Step  30

Go to Step  42

30

Using a test light, connect between the clutch pedal cruise control release switch connector input circuit terminal and ground.

Does the test light illuminate?

--

Go to Step  31

Go to Step  43

31

Using a test light connect between the clutch pedal cruise control release switch connector output circuit terminal and ground.

Does the test light illuminate?

--

Go to Step  42

Go to Step  51

32

Repair the short to ground in the ignition voltage circuit to the cruise control module terminal F and replace the cruise fuse. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

33

Repair the open in the ignition voltage circuit to the cruise control module. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

34

Repair the open in the ground circuit to the cruise control module terminal E. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

35

Repair the open in the cruise on/off signal circuit to the cruise control module terminal A. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

36

Repair the open in the ignition voltage circuit to the cruise control switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

37

Repair the open in the set/coast signal circuit to the cruise control module terminal B. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

38

Repair the open in the RES/ACC signal circuit to the cruise control module terminal C. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

39

Repair the open in the stoplamp switch signal circuit to the cruise control module terminal G. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

40

Repair the open in the ignition voltage circuit to the stoplamp switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

41

Repair the open in the ignition voltage circuit to the brake pedal cruise control release switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

42

Repair the open in the cruise release switch signal circuit to the cruise control module terminal D. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

43

Repair the open in the cruise release switch signal circuit between the brake pedal and clutch pedal cruise release switches. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

44

Repair the open in the cruise inhibit/enable signal circuit to the cruise control module terminal H. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

45

Repair the short to voltage in the cruise inhibit/enable signal circuit to the cruise control module terminal H. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

46

Inspect the cruise control module connector for poor terminal connections/terminal tension. Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition

--

Go to Cruise Control System Check

Go to Step 51

47

Replace the cruise control module. Refer to Cruise Control Module Replacement .

Is the repair complete?

--

Go to Cruise Control System Check

--

48

Replace the cruise control switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering.

Is the repair complete?

--

Go to Cruise Control System Check

--

49

Replace the stoplamp switch. Refer to Stop Lamp Switch Replacement .

Is the repair complete?

--

Go to Cruise Control System Check

--

50

Replace the brake pedal cruise control release switch. Refer to Stop Lamp Switch Replacement .

Is the repair complete?

--

Go to Cruise Control System Check

--

51

Replace the clutch pedal cruise control release switch. Refer to Clutch Pedal Engine Start Switch Replacement in Clutch Systems.

Is the repair complete?

--

Go to Cruise Control System Check

--

Cruise Control Inoperative Diesel

Step

Action

Value(s)

Yes

No

1

Did you perform the Cruise Control System Check?

--

Go to Step 2

Go to Cruise Control System Check

2
  1. Verify that no diagnostic trouble codes (DTCs) are set that could impact cruise control operations.
  2. Place the ignition switch to the RUN position.
  3. Disconnect the connector C2 at the powertrain control module (PCM).
  4. Connect a digital multimeter (DMM), set on volts, between the PCM connector C2 cavity A11 for the CKT 397 (GRY) and ground.
  5. Place the cruise control switch in the ON position.

Is there battery voltage?

--

Go to Step 5

Go to Step 3

3
  1. Disconnect connector C266 at the steering column.
  2. Connect a DMM, set on volts, between connector C266 pin A13 for the CKT 41 (BRN) and ground.

Is there battery voltage?

--

Go to Step 4

Go to Step 18

4

Connect a digital multimeter (DMM), set on ohms, between connector C266 cavities A 13 for the CKT 41 (BRN) pigtail wire and A 12 for the CKT 397 (GRY) pigtail wire

Is there continuity?

--

Go to Step 19

Go to Step 20

5
  1. Connect a DMM, set on volts, between the PCM connector C2 cavity B11 for the CKT 84 (DK BLU) wire and ground.
  2. Actuate the S/C switch on the cruise control switch.

Is there battery voltage?

--

Go to Step 7

Go to Step 6

6
  1. Disconnect connector C266 at the steering column.
  2. Connect a DMM, set on ohms, between the connector C266 cavity A 13 for CKT 41 (BRN) pigtail wire and cavity A 14 for the CKT 84 (DK BLU) pigtail wire.
  3. Actuate the S/C switch on the cruise control switch.

Is there continuity?

--

Go to Step 21

Go to Step 22

7

Connect a DMM, set on volts, between the PCM connector C2 cavity B10 for the CKT 17 (WHT) wire and ground.

Is there battery voltage?

--

Go to Step 8

Go to Step 9

8
  1. Disconnect the connector at the stoplamp switch.
  2. Connect a DMM, set on ohms, between the stoplamp switch pins A and B.

Is there continuity?

--

Go to Step 23

Go to Step 24

9

With the DMM still connected, depress the brake pedal.

Is there battery voltage?

--

Go to Step 12

Go to Step 10

10
  1. Disconnect the connector at the stoplamp switch.
  2. Connect a DMM between the stoplamp switch connector cavity B for the CKT 140 (ORN) and ground.

Is there battery voltage?

--

Go to Step 11

Go to Step 25

11
  1. Connect a DMM, set on ohms, between the stoplamp switch pins A and B.
  2. Depress the brake pedal.

Is there continuity?

--

Go to Step 26

Go to Step 34

12

Connect a DMM, set on volts, between the PCM connector C2 cavity B9 for CKT 420 (PPL) and ground.

Is there battery voltage?

--

Go to Step 27

Go to Step 13

13
  1. Disconnect the connector at the stoplamp switch.
  2. Connect a DMM, set on volts, between the stoplamp switch connector cavity F for the CKT 441 (BRN) wire and ground

Is there battery voltage?

--

Go to Step 14

Go to Step 28

14

Is the vehicle equipped with an automatic transmission?

--

Go to Step 15

Go to Step 16

15
  1. Backprobe the stoplamp switch pins E and F with a DMM, set on ohms.
  2. Observe the DMM.
  3. Depress the brake pedal.
  4. Observe the DMM.

Is there continuity with the brake pedal released and no continuity with the brake pedal depressed?

--

Go to Step 30

Go to Step 29

16

Connect a DMM, set on volts, from CKT 420 (PPL) wire at the clutch pedal switch cavity B to ground.

Is there battery voltage?

--

Go to Step 17

Go to Step 31

17

Connect a DMM, set on volts, between the CKT 379 (BRN/WHT) at the clutch pedal position switch to ground.

Is there battery voltage?

--

Go to Step 32

Go to Step 33

18

Repair the open in CKT 41 (BRN) between the IP fuse block and connector C266. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Cruise Control System Check

--

19

Repair the open in the CKT 397 (GRY) wire between the connector C266 and the PCM. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Cruise Control System Check

--

20
  1. Inspect for an open in CKT 41 (BRN) pigtail wire or in CKT 397 (GRY) pigtail wire in the steering column, repair as necessary. Refer to Wiring Repairs .
  2. If no opens are found, replace the cruise control switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle .

Is the repair complete?

--

Go to Cruise Control System Check

--

21

Repair the open in CKT 84 (DK BLU) between connector C266 and the PCM. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Cruise Control System Check

--

22
  1. Inspect for an open in CKT 84 (DK BLU) pigtail wire in the steering column, repair as necessary. Refer to Wiring Repairs .
  2. If no opens are found, replace the cruise control switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle .

Is the repair complete?

--

Go to Cruise Control System Check

--

23

Adjust or replace the stoplamp switch.

The stoplamp switch contact is supposed to be open. Refer to Stop Lamp Switch Replacement .

Is the repair complete?

--

Go to Cruise Control System Check

--

24

Repair the short to voltage in CKT 17 (WHT) between the stoplamp switch and the PCM. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Cruise Control System Check

--

25

Repair the open in CKT 140 (ORN) between the IP fuse block and the stoplamp switch. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Cruise Control System Check

--

26

Repair the open in CKT 17 (WHT) between the stoplamp switch and the PCM. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Cruise Control System Check

--

27

Replace the PCM. Refer to Powertrain Control Module Replacement/Programming .

Is the repair complete?

--

Go to Cruise Control System Check

--

28

Repair the open in CKT 441 (BRN) between the IP fuse block and the stoplamp switch. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Cruise Control System Check

--

29

Adjust or replace the stoplamp switch. Refer to Stop Lamp Switch Replacement .

Is the repair complete?

--

Go to Cruise Control System Check

--

30

Repair the open in CKT 420 (PPL) between the stoplamp switch and the PCM. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Cruise Control System Check

--

31

Repair the open in the CKT 420 (PPL) between the stoplamp switch and the clutch pedal position switch. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Cruise Control System Check

--

32

Repair the open in CKT 379 (BRN/WHT) between the clutch pedal position switch and the PCM. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Cruise Control System Check

--

33

Replace the clutch pedal position switch. Refer to Clutch Pedal Engine Start Switch Replacement .

Is the repair complete?

--

Go to Cruise Control System Check

--

34

Adjust or replace the stoplamp switch. The stoplamp switch contact should be closed with the brake pedal actuated. Refer to Stop Lamp Switch Replacement .

Is the repair complete?

--

Go to Cruise Control System Check

--