GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Important.

    • To avoid misdiagnosis:
    • Check for proper operation of brake and CHMSL lamps.
    • Check throttle linkage for mechanical binding which could cause system to malfunction.
    • Check for 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?

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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 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 23

Go to Step 10

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 12

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 15

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 17

7

Press and hold the Clear switch.

Does the Brake Switch lamp turn off on the J 42958?

--

Go to Step 8

Go to Step 18

8

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 9

Go to Step 21

9

  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 37

Go to Powertrain On Board Diagnostic (OBD) System Check

10

  1. Disconnect the J 42958
  2. Reconnect the Cruise Control Module connector.
  3. Using a test light, backprobe between the Cruise control Module connector terminal F and ground.

Does the test light illuminate?

--

Go to Step 11

Go to Step 24

11

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

Does the test light illuminate?

--

Go to Step 33

Go to Step 25

12

  1. Disconnect the J 42958
  2. Using a test light, backprobe between the Cruise Control Module connector terminal A and ground.

Does the test light illuminate?

--

Go to step 37

Go to step 13

13

Using a test light, backprobe between the Cruise Control Switch connectror terminal D and ground.

Does the test light illuminate?

--

Go to Step 14

Go to Step 26

14

  1. Using a test light, backprobe between the Cruise Control 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 27

Go to step 34

15

  1. Using a test light, backprobe betweeen the steering column connector (behind the airbag) terminal B and ground.
  2. Press and hold the Set/Coast Switch.

Does the test light illuminate?

--

Got to Step 28

Go to Step 16

16

Using a test light, backprobe between the steering column connector (behind the airbag) terminal A and ground.

Does the test light illuminate?

--

Go to Step 36

Go to Step 29

17

  1. Using a test light, probe between the steering column connector (behind the airbag) terminal C and ground
  2. Press and hold the Res/Acc switch.

Does the test light illuminte?

--

Go to Step 30

Go to Step 36

18

Using a test light, probe between the cruise control release switch terminal A and ground.

Does the test light illuminate?

--

Go to Step 31

Go to Step 19

19

Using a test light, probe between the cruise control release switch terminal B and ground.

Does the test light illuminate?

--

Go to Step 35

Go to Step 20

20

Using a test light, probe between the steering column connector (behind the airbag) terminal D and ground.

Does the test light illuminate?

--

Go to Step 32

Go to Step 36

21

Press and hold the Brake Pedal.

Do the stop lamps illuminate?

--

Go to Step 22

Go to Automatic Transmission Shift Lock Control System Check

22

  1. Disconnect the J 42958
  2. Using 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 37

Go to Step 33

23

Repair the short in circuit 341.

Is the repair complete?

--

Go to Cruise Control System Check

--

24

Repair the open in circuit 341.

Is the repair complete?

--

Go to Cruise Control System Check

--

25

Repair the open in circuit 1750.

Is the repair complete?

--

Go to Cruise Control System Check

--

26

Repair the open in circuit 43.

Is the repair complete?

--

Go to Cruise Control System Check

--

27

Repair the open in circuit 397.

Is the repair complete?

--

Go to Cruise Control System Check

--

28

Repair the open in circuit 84.

Is the repair complete?

--

Go to Cruise Control System Check

--

29

Repair the open in circuit 397.

Is the repair complete?

--

Go to Cruise Control System Check

--

30

Repair the open in circuit 87.

Is the repair complete?

--

Go to Cruise Control System Check

--

31

Repair the open in circuit 986.

Is the repair complete?

--

Go to Cruise Control System Check

--

32

Repair the open in circuit 86.

Is the repair complete?

--

Go to Cruise Control System Check

--

33

Repair the open in circuit 17.

Is the repair complete?

--

Go to Cruise Control System Check

--

34

Replace the Cruise Control Swtich. Refer to Cruise Control and Hazard Warning Switch Replacement for service procedure.

Is the repair complete?

--

Go to Cruise Control System Check

--

35

Replace the Cruise Control Release Swtich. Refer to Cruise Control Release Switch Replacement for service procedure.

Is the repair complete?

--

Go to Cruise Control System Check

--

36

Replace the RH Steering Wheel Control Switch. Refer to Steering Wheel Control Switch Assembly Replacement for service procedure.

Is the repair complete?

--

Go to Cruise Control System Check

--

37

  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

--