GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Corvette 🢒 Body and Accessories 🢒 Cruise Control 🢒 Does Not Resume, Accelerate,or Tap Up or Down

Does Not Resume, Set, Accelerate, or Tap Up or Down

Step

Action

Value(s)

Yes

No

DEFINITION: Cruise Control will not respond when any of the switches are used at the stalk mounted lever.

1

Where you sent here from the Cruise Control Diagnostic System Check?

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Go to Step 2

Go to Cruise Control System Check

2

Check the CR CONT Minifuse® #20 for an open circuit.

Is the fuse open?

--

Go to Step 4

Go to Step 3

3
  1. Disconnect connector C217.
  2. Connect a DMM between connector C217 terminal B and ground.
  3. Turn the ignition switch to the ON position.
  4. Measure the available voltage at connector C217 terminal B.

Is the voltage within the specified values?

10.0 -14.0V

Go to Step 13

Go to Step 5

4
  1. Remove the open fuse.
  2. Disconnect connector C217.
  3. Disconnect the DRL Control Module.
  4. Using a DMM, measure the resistance between ground and the connector C217 terminal B leading towards the instrument panel electrical center.

Is CKT 1239 continuous to ground?

--

Go to Step 9

Go to Step 6

5

Repair an open in CKT 1239.

Is the repair complete?

--

Go to Cruise Control System Check

--

6
  1. Disconnect the throttle actuator (TAC) control module.
  2. Using a DMM, measure the resistance between ground and connector C217 terminal A leading towards the throttle actuator (TAC) control module connector C2.

Is CKT 397 continuous to ground?

--

Go to Step 10

Go to Step 7

7

Using a DMM, measure the resistance between ground and connector C217 terminal C leading towards the throttle actuator (TAC) control module connector C2.

Is CKT 84 continuous to ground?

--

Go to Step 11

Go to Step 8

8

Using a DMM, measure the resistance between ground and connector C217 terminal D leading towards the throttle actuator (TAC) control module connector C2.

Is CKT 87 continuous to ground?

--

Go to Step 12

Go to Step 22

9

Repair CKT 1239 for a short to ground.

Is the repair complete?

--

Go to Cruise Control System Check

--

10

Repair a short to ground in CKT 397.

Is the repair complete?

--

Go to Cruise Control System Check

--

11

Repair a short to ground in CKT 84.

Is the repair complete?

--

Go to Cruise Control System Check

--

12

Repair a short to ground in CKT 87.

Is the repair complete?

--

Go to Cruise Control System Check

--

13
  1. Reconnect connector C217.
  2. Using a DMM, backprobe connector C217 terminal A with the positive lead.
  3. Connect the negative lead from the DMM to ground.
  4. Turn the ignition switch to ON.
  5. Turn the cruise control ON/OFF switch to ON.
  6. Measure the available voltage at connector C217 terminal A with the cruise control switch in the ON position.

Is the voltage within the specified values?

10.0 -14.0V

Go to Step 14

Go to Step 22

14
  1. Using a DMM, backprobe connector C217 terminal C with the positive lead.
  2. Connect the negative lead from the DMM to ground.
  3. Turn the ignition switch to ON.
  4. Turn the cruise control ON/OFF switch to ON.
  5. Measure the available voltage at connector C217 terminal C with the SET button depressed.

Is the voltage within the specified values?

10.0 -14.0V

Go to Step 15

Go to Step 22

15
  1. Using a DMM, backprobe connector C217 terminal D with the positive lead.
  2. Connect the negative lead from the DMM to ground.
  3. Turn the ignition switch to ON.
  4. Turn the cruise control ON/OFF switch to ON.
  5. Measure the available voltage at connector C217 terminal D with the RESUME/ACCEL button depressed.

Is the voltage within the specified values?

10.0 -14.0V

Go to Step 16

Go to Step 22

16
  1. Disconnect the throttle actuator control (TAC) module connector C2.
  2. Connect a DMM between the TAC module connector C2 terminal 14 and ground.
  3. Turn the ignition switch to ON.
  4. Turn the cruise control ON/OFF switch to ON.
  5. Measure the available voltage at the TAC module connector C2 terminal 14.

Is the voltage within the specified values?

10.0 -14.0V

Go to Step 17

Go to Step 19

17
  1. Connect a DMM between the TAC module connector C2 terminal 4 and ground.
  2. Turn the ignition switch to ON.
  3. Turn the cruise control ON/OFF switch to ON.
  4. Measure the available voltage at the TAC module connector C2 terminal 4 with the SET button depressed.

Is the voltage within the specified values?

10.0 -14.0V

Go to Step 18

Go to Step 20

18
  1. Connect a DMM between the TAC module connector C2 terminal 5 and ground.
  2. Turn the ignition switch to ON.
  3. Turn the cruise control ON/OFF switch to ON.
  4. Measure the available voltage at the TAC module connector C2 terminal 5 with the RESUME/ACCEL button depressed.

Is the voltage within the specified values?

10.0 -14.0V

Go to Step 23

Go to Step 21

19

Repair the open in CKT 397.

Is the repair complete?

--

Go to Cruise Control System Check

--

20

Repair the open in CKT 84.

Is the repair complete?

--

Go to Cruise Control System Check

--

21

Repair the open in CKT 87.

Is the repair complete?

--

Go to Cruise Control System Check

--

22

Replace the cruise control switch.

Is the repair complete?

--

Go to Cruise Control System Check

--

23
  1. Connect a DMM between the TAC module connector C2 terminal 7 and ground.
  2. Turn the ignition switch to ON.
  3. Measure the available voltage at the TAC module connector C2 terminal 7.

Is the voltage within the specified values?

10.0 -14.0V

Go to Step 24

Go to Step 25

24

Replace the throttle actuator control (TAC) module.

Is the repair complete?

--

Go to Cruise Control System Check

--

25

Check the THROT CONT Minifuse® #17 for an open circuit.

Is the fuse open?

--

Go to Step 26

Go to Step 27

26

Repair a short to ground in CKT 539.

Is the repair complete?

--

Go to Cruise Control System Check

--

27
  1. Connect a DMM between the THROT CONT Minifuse® #17 terminal A and ground.
  2. Turn the ignition switch to ON.
  3. Measure the available voltage at the THROT CONT Minifuse® #17 terminal A.

Is the voltage within the specified values?

10.0 -14.0V

Go to Step 28

Go to Ignition Relay Diagnosis in Engine Controls

28

Repair the open in CKT 539.

Is the repair complete?

--

Go to Cruise Control System Check

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