GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Regal 🢒 Body and Accessories 🢒 Cruise Control 🢒 Cruise Control Inoperative

Step

Action

Value(s)

Yes

No

Important: In order to avoid misdiagnosis, test for the following conditions:

    • Throttle linkage for mechanical binding which could cause system to malfunction
    • Stored Diagnostic Trouble Codes (DTCs) in the PCM. Refer to Powertrain Control Module Diagnosis in Engine Controls.
      • The PCM will inhibit cruise control:
      • When vehicle speed is less than 40 km/h (25 mph).
      • When PARK, REVERSE, NEUTRAL, or 1st gear is indicated by the transaxle range 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 more information.

1

Was the Cruise Control System Check performed?

--

Go to Step 2

Go to Cruise Control System Check

2
  1. Connect the J 42958 as specified in the user manual.
  2. Turn Ignition switch to the On position.
  3. Place cruise switch in the off position.

Are the Brake and Ignition lamps illuminated on the J 42958?

--

Go to Step 4

Go to Step 3

3

Check the CRUISE Fuse for an open.

Is the CRUISE Fuse open?

--

Go to Step 18

Go to Step 9

4

Set the cruise switch to the ON position.

Do the On/Off, Brake, and Cruise lamps illuminate on the J 42958?

--

Go to Step 5

Go to Step 11

5

Press and hold the Set/Coast switch.

Does the Set/Hold lamp illuminate on the J 42958?

--

Go to Step 6

Go to Step 13

6

Press and hold the Res/Acc switch.

Does the Res/Acc lamp illuminate on the J 42958?

--

Go to Step 7

Go to Step 15

7

Press and hold the brake pedal.

Does the Brake Lights lamp illuminate and the Brake lamp turn off on the J 42958?

--

Go to Step 8

Go to Step 16

8
  1. Leaving the J 42958 connected road test the vehicle at a minimum of 10 MPH.
  2. Have an assistant observe the J 42958 VSS lamp.

Does the VSS lamp flash?

--

Go to Step 27

Go to Powertrain On Board Diagnostic (OBD) System Check

9
  1. Disconnect the J 42958
  2. Reconnect the cruise control module connector.
  3. With a test light, backprobe between the cruise control module connector terminal F and ground.

Does the test light illuminate?

--

Go to Step 10

Go to Step 19

10

With a test light, backprobe between the cruise control module connector terminal E and B+.

Does the test light illuminate?

--

Go to Step 27

Go to Step 20

11
  1. Disconnect the J 42958
  2. With a test light, backprobe between the cruise control module connector terminal A and ground.

Does the test light illuminate?

--

Go to Step 27

Go to Step 12

12
  1. With a test light, backprobe between the cruise control release switch connector terminal A and ground.
  2. Press and hold the cruise control switch in the ON position.

Does the test light illuminate?

--

Go to Step 19

Go to Step 25

13
  1. With a test light, backprobe between C201 (behind the airbag) terminal A8 and ground.
  2. Press and hold the Set/Coast Switch.

Does the test light illuminate?

--

Got to Step 22

Go to Step 14

14

With a test light, backprobe between C201 (behind the airbag) terminal A9 and ground.

Does the test light illuminate?

--

Go to Step 26

Go to Step 21

15
  1. With a test light, probe between C201 (behind the airbag) terminal A7 and ground
  2. Press and hold the Res/Acc switch.

Does the test light illuminate?

--

Go to Step 23

Go to Step 26

16

Press and hold the brake pedal.

Do the stop lamps illuminate?

--

Go to Step 17

Go to Automatic Transmission Shift Lock Control System Check

17
  1. Disconnect the J 42958
  2. With a test light, backprobe 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 27

Go to Step 24

18

Repair the short in circuit 341.

Is the repair complete?

--

Go to Cruise Control System Check

--

19

Repair the open in circuit 341.

Is the repair complete?

--

Go to Cruise Control System Check

--

20

Repair the open in circuit 1750.

Is the repair complete?

--

Go to Cruise Control System Check

--

21

Repair the open in circuit 397.

Is the repair complete?

--

Go to Cruise Control System Check

--

22

Repair the open in circuit 84.

Is the repair complete?

--

Go to Cruise Control System Check

--

23

Repair the open in circuit 87.

Is the repair complete?

--

Go to Cruise Control System Check

--

24

Repair the open in circuit 17.

Is the repair complete?

--

Go to Cruise Control System Check

--

25

Replace the cruise control release switch. Refer to Cruise Control Release Switch Replacement for service procedure.

Is the repair complete?

--

Go to Cruise Control System Check

--

26

Replace the turn signal lever. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle for service procedure.

Is the repair complete?

--

Go to Cruise Control System Check

--

27
  1. Check the cruise control module connector for proper terminal contact. Repair any poor terminal contact found.
  2. If no poor terminal contact was found replace the cruise control module. Refer to Cruise Control Module Replacement for service procedure.

Is the repair complete?

--

Go to Cruise Control System Check

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