GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1997 🢒 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?

Go to Step 2

Go toCruise Control System Check

2

Check the 10 amp CR CONT Minifuse® #20 for an open circuit.

Is the fuse open?

Go to Step 4

Go to Step 3

3
  1. Turn the ignition switch to the RUN position.
  2. Using a DMM, measure the voltage between connector C221 terminal B and ground.

Is the measured voltage within the specified values?

10.0 -14.0V

Go to Step 13

Go to Step 5

4
  1. Remove the blown fuse.
  2. Disconnect connector C221.
  3. Disconnect the DRL Control Module.
  4. Using a DMM, measure the resistance between the connector C221 terminal B and ground.

Is the measured resistance to ground infinite?

Go to Step 9

Go to Step 6

5

Repair CKT 1239 for an open.

Is the repair complete?

Go toCruise Control System Check

6
  1. Disconnect the Throttle Actuator (TAC) Control Module.
  2. Using a DMM, measure the resistance between the connector C221 terminal A and ground.

Is the measured resistance to ground infinite?

Go to Step 10

Go to Step 7

7

Using a DMM, measure the resistance between the connector C221 terminal C and ground.

Is the measured resistance to ground infinite?

Go to Step 11

Go to Step 8

8

Using a DMM, measure the resistance between the connector C221 terminal D and ground.

Is the measured resistance to ground infinite?

Go to Step 12

Go to Step 22

9

Repair CKT 1239 for a short to ground.

Is the repair complete?

Go toCruise Control System Check

10

Repair CKT 397 for a short to ground.

Is the repair complete?

Go toCruise Control System Check

11

Repair CKT 84 for a short to ground.

Is the repair complete?

Go toCruise Control System Check

12

Repair CKT 87 for a short to ground.

Is the repair complete?

Go toCruise Control System Check

13
  1. Turn the ignition switch to RUN.
  2. Turn the cruise control ON/OFF switch to ON.
  3. Using a DMM, backprobe connector C221 terminal A and ground.
  4. Measure the voltage at the connector.

Is the measured voltage within the specified value(s)?

10.0 -14.0V

Go to Step 14

Go to Step 22

14
  1. Turn the ignition switch to RUN.
  2. Turn the cruise control ON/OFF switch to ON.
  3. Using a DMM, backprobe connector C221 terminal C and ground.
  4. Measure the voltage at the connector with the SET button depressed.

Is the measured voltage within the specified value(s)?

10.0 -14.0V

Go to Step 15

Go to Step 22

15
  1. Turn the ignition switch to RUN.
  2. Turn the cruise control ON/OFF switch to ON.
  3. Using a DMM, backprobe connector C221 terminal D and ground.
  4. Measure the voltage at the connector with the Resume/Accel button depressed.

Is the measured voltage within the specified value(s)?

10.0 -14.0V

Go to Step 16

Go to Step 22

16
  1. Disconnect the Throttle Actuator Control (TAC) Module connector.
  2. Turn the ignition switch to RUN.
  3. Turn the cruise control ON/OFF switch to ON.
  4. Using a DMM, measure the voltage between the TAC Module connector terminal 14 and ground.

Is the measured voltage within the specified value(s)?

10.0 -14.0V

Go to Step 17

Go to Step 19

17
  1. Turn the ignition switch to RUN.
  2. Turn the cruise control ON/OFF switch to ON.
  3. Using a DMM, measure the voltage between the TAC Module connector terminal 4 and ground with the SET button depressed.

Is the measured voltage within the specified value(s)?

10.0 -14.0V

Go to Step 18

Go to Step 20

18
  1. Turn the ignition switch to RUN.
  2. Turn the cruise control ON/OFF switch to ON.
  3. Using a DMM, measure the voltage between the TAC Module connector terminal 5 and ground with the Resume/Accel button depressed.

Is the measured voltage within the specified value(s)?

10.0 -14.0V

Go to Step 23

Go to Step 21

19

Repair the open in CKT 397.

Is the repair complete?

Go toCruise Control System Check

20

Repair the open in CKT 84.

Is the repair complete?

Go toCruise Control System Check

21

Repair the open in CKT 87.

Is the repair complete?

Go toCruise Control System Check

22

Replace the Cruise Control Column Switch.

Is the repair complete?

Go toCruise Control System Check

23

Replace the Throttle Actuator Control (TAC) Module.

Is the repair complete?

Go toCruise Control System Check