GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Tahoe 4WD - RHD 🢒 Body and Accessories 🢒 Cruise Control 🢒 Cruise Control Inoperative

Cruise Control Inoperative Gasoline

Step

Action

Value(s)

Yes

No

1
  1. Verify that no Diagnostic Trouble Codes (DTCs) are set that may affect cruise control operations.
  2. Disconnect the connector at the cruise control module.
  3. Turn the ignition switch to the RUN position.
  4. Connect a test lamp between cruise control module connector cavity F, CKT 41(BRN) and ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 2

2

Locate and repair the open in CKT 41(BRN) between the IP fuse block and the cruise control module.

Is the repair complete?

--

System OK

--

3

Connect a self-powered test lamp between the cruise control module connector cavity E, CKT 451 (BLK/WHT) and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 4

4

Locate and repair the open in CKT 451 (BLK/WHT) between the cruise control module and G103 or G104.

Is the repair complete?

--

System OK

--

5
  1. Turn the cruise control switch to the ON position.
  2. Connect a test lamp between the cruise control module connector cavity A, CKT 397 (GRY) and C266.

Does the test lamp light?

--

Go to Step 11

Go to Step 6

6
  1. Disconnect the connector at the steering column.
  2. Connect a test lamp between C266 pin A13, CKT 41(BRN) and ground.

Does the test lamp light?

--

Go to Step 8

Go to Step 7

7

Locate and repair the open in CKT 41(BRN) between the IP fuse block and C266.

Is the repair complete?

--

System OK

--

8

Connect a self-powered test lamp between C266 cavity A13, CKT 41(BRN) and cavity A12, CKT 397 (GRY) at the cruise control switch.

Does the test lamp light?

--

Go to Step 9

Go to Step 10

9

Locate and repair the open in CKT 397 (GRY) between C266 and the cruise control module.

Is the repair complete?

--

System OK

--

10
  1. Locate and repair an open in one of teh following circuits in the steering column:
    2. • CKT 41 (BRN)
    • CKT 397 (GRY)
  2. If the wires are good, replace the cruise control switch.

Are the repairs complete?

--

System OK

--

11
  1. Turn the cruise control switch to the OFF position.
  2. Connect a test lamp between the cruise control module connector cavity B, CKT 84 (DK BLU) and ground.

Does the test lamp light?

--

Go to Step 12

Go to Step 13

12

Locate and repair the short to voltage in CKT 84 (DK BLU) between the cruise control switch and the cruise control module.

Is the repair complete?

--

System OK

--

13
  1. Turn the cruise control switch to the ON position.
  2. Connect a test lamp between the cruise control module connector cavity B, CKT 84 (DK BLU) and ground.
  3. Press the SET/COAST push button.

Does the test lamp light?

--

Go to Step 17

Go to Step 14

14
  1. Disconnect C266 at the steering column.
  2. Connect a self-powered test lamp between cruise control module connector cavity B and C266 pin A14, CKT 84 (DK BLU).

Does the test lamp light?

--

Go to Step 15

Go to Step 16

15
  1. Locate and repair the open in CKT 84 (DK BLU) in the steering column.
  2. If the wire is good, replace the cruise control switch.

Are the repairs complete?

--

System OK

--

16

Locate and repair the open in CKT 84 (DK BLU) between C266 and the cruise control module.

Is the repair complete?

--

System OK

--

17

Connect a test lamp between the cruise control module connector cavity B, CKT 17 (WHT) and ground.

Does the test lamp light?

--

Go to Step 18

Go to Step 21

18
  1. Disconnect the connector at the stoplamp switch.
  2. Connect a self-powered test lamp at the stoplamp switch between pin A and pin B.

Does the test lamp light?

--

Go to Step 19

Go to Step 20

19

Important: Ensure that these contacts remain open. Do not press the brake pedal.

Adjust or replace the stoplamp switch.

Is the repair complete?

--

System OK

--

20

Locate and repair the short to voltage in CKT 17 (WHT) between the stoplamp switch and the cruise control module.

Is the repair complete?

--

System OK

--

21
  1. Connect a test lamp between cruise control module connector cavity G, CKT 17 (WHT) and ground.
  2. Press the brake pedal.

Does the test lamp light?

--

Go to Step 25

Go to Step 22

22
  1. Disconnect the connector at the stoplamp switch.
  2. Connect a self-powered test lamp between stoplamp switch connector cavity B and cruise control module connector cavity G, CKT 17 (WHT).

Does the test lamp light?

--

Go to Step 23

Go to Step 24

23

Adjust or replace the stoplamp switch.

Is the repair complete?

--

System OK

--

24

Locate and repair the open in CKT 17 (WHT) between the stoplamp switch and the cruise control module.

Is the repair complete?

--

System OK

--

25

Connect a test lamp between cruise control module connector cavity D, CKT 420 (PPL) and ground.

Does the test lamp light?

--

Go to Step 31

Go to Step 26

26
  1. Disconnect the connector at the stoplamp switch.
  2. Connect a self-powered test lamp at the stoplamp switch between pin D and pin C.

Does the test lamp light?

--

Go to Step 28

Go to Step 27

27

Adjust or replace the stoplamp switch.

Is the repair complete?

--

System OK

--

28

Connect a test lamp between stoplamp switch connector cavity D, CKT 441 (BRN) and ground.

Does the test lamp light?

--

Go to Step 29

Go to Step 30

29

Locate and repair the open in CKT 420 (PPL) between the stoplamp switch and the cruise control module.

Is the repair complete?

--

System OK

--

30
  1. Locate and repair the open in CKT 441 (BRN) between the IP fuse block and the stoplamp switch.
  2. Inspect for DTCs related to the antilock brake system (ABS).

Are the repairs compete?

--

System OK

--

31

Connect a J 39200 Digital Multimeter (DMM) between cruise control module connector cavity K, CKT 817 (DK GRN/WHT) and ground.

Is any voltage present?

--

Go to Step 32

Go to Step 35

32
  1. Disconnect connector C4 at the Vehicle Control Module (VCM).
  2. Connect a self-powered test lamp between VCM connector C4 cavity 3 and cruise control module connector cavity K, CKT 817 (DK GRN/WHT).

Is the voltage within the specified range?

11-14 V

Go to Step 33

Go to Step 34

33

Locate and repair the short to voltage in CKT 817 (DK GRN/WHT) between the cruise control module and the VCM.

Is the repair complete?

--

System OK

--

34

Replace the VCM.

Is the repair complete?

--

System OK

--

35
  1. Disconnect connector C4 at the VCM.
  2. Connect a self-powered test lamp between VCM connector C4 cavity 3 and cruise control module connector cavity K, CKT 817 (DK GRN/WHT).

Does the test lamp light?

--

Go to Step 37

Go to Step 36

36

Locate and repair the open in CKT 817 (DK GRN/WHT) between the VCM and the cruise control module.

Is the repair complete?

--

System OK

--

37

Connect a self-powered test lamp between cruise control module connector cavity K , CKT 817 (DK GRN/WHT ) and ground.

Does the test lamp light?

--

Go to Step 38

Go to Step 39

38

Locate and repair the short to ground in CKT 817 (DK GRN/WHT) between the VCM and the cruise control module.

Is the repair complete?

--

System OK

--

39
  1. Connect connector C4 at the VCM.
  2. Prepare to operate the vehicle.
  3. Ensure that the cruise control module connector is disconnected.
  4. Turn the radio OFF.
  5. Connect a J 39200 DMM between cruise control module connector cavity K, CKT 817 (DK GRN/WHT) and ground.
  6. Operate the vehicle. Observe the voltage.

Is the voltage within the specified range?

0-5 V

Go to Step 43

Go to Step 40

40
  1. Continue to operate the vehicle.
  2. Turn the radio ON.

Does the voltage equal the specified value?

0 V

Go to Step 41

Go to Step 42

41

Replace the radio.

Is the repair complete?

--

System OK

--

42

Replace the cruise control module.

Is the repair complete?

--

System OK

--

43
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the VCM connector C4.
  3. Connect a self-powered test lamp between CKT 396 (LT BLU/BLK) at cruise control module pin J and ground.

Does the test lamp light?

--

Go to Step 44

Go to Step 45

44

Locate and repair the short to ground in CKT 396 (LT BLU/BLK ) between the cruise control module and the VCM.

Is the repair complete?

--

System OK

--

45
  1. Turn the ignition switch to the ON position.
  2. Turn the cruise control switch to the ON position.
  3. Connect a J 39200 DMM between CKT 817 (DK GRN/WHT) at the VCM connector C4 and ground.

Is the voltage less than the specified value?

4.5 V

Go to Step 46

Go to Step 47

46
  1. Inspect for poor connections at the VCM.
  2. If the connections are OK, replace the VCM.

Are the repairs complete?

--

System OK

--

47
  1. Inspect for poor connections at the cruise control module.
  2. If the connections are OK, replace the cruise control module.

Is the repair complete?

--

System OK

--

Cruise Control Inoperative Diesel

Step

Action

Value(s)

Yes

No

1
  1. Verify that no Diagnostic Trouble Codes (DTCs) are set that may affect cruise control operations.
  2. Turn the ignition switch to the RUN position.
  3. Disconnect connector C2 at the Powertrain Control Module (PCM).
  4. Connect a test lamp between the PCM connector C2 cavity A11, CKT 397 (GRY) and ground.
  5. Turn the cruise control switch to the ON position.

Does the test lamp light?

--

Go to Step 7

Go to Step 2

2
  1. Disconnect C266 at the steering column.
  2. Connect a test lamp between C266 pin A13, CKT 41 (BRN) and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Locate and repair the open in CKT 41 (BRN) between the IP fuse block and C266.

Is the repair complete?

--

System OK

--

4

Connect a self-powered test lamp between C266 cavity A13, CKT 41 (BRN) and cavity A12, CKT 397 (GRY).

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

Locate and repair the open in CKT 397 (GRY) between C266 and the PCM.

Is the repair complete?

--

System OK

--

6
  1. Locate and repair the open in one of the following circuits in the steering column:
    2. • CKT 41 (BRN)
    • CKT 397 (GRY)
  2. If the wires are good, replace the cruise control switch.

Is the repair complete?

--

System OK

--

7
  1. Connect a test lamp between the PCM connector C2 cavity B11, CKT 84 (DK BLU) and ground.
  2. Turn the cruise control switch to the SET/COAST position.

Does the test lamp light?

--

Go to Step 11

Go to Step 8

8
  1. Disconnect C266 at the steering column.
  2. Connect a self-powered test lamp between C266 cavity A13, CKT 41 (BRN) and cavity A14, CKT 84 (DK BLU).
  3. Turn the cruise control switch to the SET/COAST position.

Does the test lamp light?

--

Go to Step 9

Go to Step 10

9

Locate and repair the open in CKT 84 (DK BLU) between C266 and the PCM.

Is the repair complete?

--

System OK

--

10
  1. Locate and repair the open in CKT 84 (DK BLU) in the steering column.
  2. If the wire is good, replace the cruise control switch.

Is the repair complete?

--

System OK

--

11

Connect a test lamp between the PCM connector C2 cavity B10, CKT 17 (WHT) and ground.

Does the test lamp light?

--

Go to Step 12

Go to Step 15

12
  1. Disconnect the connector at the stoplamp switch.
  2. Connect a self-powered test lamp between pin A and pin B of the stoplamp switch.

Does the test lamp light?

--

Go to Step 13

Go to Step 14

13

Important: Ensure that the contact is open.

Adjust or replace the stoplamp switch.

Is the repair complete?

--

System OK

--

14

Locate and repair the short to voltage on CKT 17 (WHT) between the stoplamp switch and the PCM.

Is the repair complete?

--

System OK

--

15

Press the brake pedal.

Does the test lamp light?

--

Go to Step 21

Go to Step 16

16
  1. Disconnect the connector at the stoplamp switch.
  2. Connect a test lamp between the stoplamp switch cavity B, CKT 140 (ORN) and ground.

Does the test lamp light?

--

Go to Step 18

Go to Step 17

17

Locate and repair the open in CKT 140 (ORN) between the IP fuse block and the stoplamp switch.

Is the repair complete?

--

System OK

--

18
  1. Connect a self-powered test lamp between the pin A and pin B of the stoplamp switch.
  2. Press the brake pedal.

Does the test lamp light?

--

Go to Step 19

Go to Step 20

19

Locate and repair the open in CKT 17 (WHT) between the stoplamp switch and the PCM.

Is the repair complete?

--

System OK

--

20

Important: Ensure that the contact is closed when the brake pedal is pressed.

Adjust or replace the stoplamp switch.

Is the repair complete?

--

System OK

--

21

Connect a test lamp between the PCM connector C2 cavity B9, CKT 420 (PPL) and ground.

Does the test lamp light?

--

Go to Step 22

Go to Step 23

22

Replace the PCM.

Is the repair complete?

--

System OK

--

23
  1. Disconnect the connector at the stoplamp switch.
  2. Connect a test lamp between the stoplamp switch cavity D, CKT 441 (BRN) and ground.

Does the test lamp light?

--

Go to Step 25

Go to Step 24

24

Locate and repair the open in CKT 441 (BRN) between the IP fuse block and the stoplamp switch.

Is the repair complete?

--

System OK

--

25
  1. Using a self-powered test lamp, backprobe the stoplamp switch pin A and pin B.
  2. Press the brake pedal.

Does the test lamp light?

--

Go to Step 26

Go to Step 27

26

Adjust or replace the stoplamp switch.

Is the repair complete?

--

System OK

--

27

Locate and repair the open in CKT 420 (PPL) between the stoplamp switch and the PCM.

Is the repair complete?

--

System OK

--