1. Connect the scan tool to the data link connector (DLC).
2. Select CRUISE CONTROL and then SPECIAL FUNCTIONS.
3. Turn ON the ignition switch, keep the engine OFF.
4. Select STEPPER MOTOR TEST.
5. Observe throttle and actuate the stepper motor.

Does the throttle move to the wide open position?

--

Go to Step 6

Go to Step 2

1. Cruise control switch OFF.
2. Disconnect the connector from the cruise control module.
3. Turn ON the ignition switch.
4. Use the DMM to measure the voltage between terminal F of the cruise control module connector and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 4

Go to Step 3

1. Locate an open or high resistance in circuits X500 and/or X106.
2. Repair the open or the high resistance in circuits X500 and/or X106.

Is the repair complete?

--

Go to Step 27

--

Use the DMM to measure the resistance between terminal E of the cruise control module connector and a known good ground.

Is the measured resistance within the specified value?

Less than 5 ohms

Go to Step 6

Go to Step 5

1. Locate an open or a high resistance in circuit F500.
2. Repair the open or a high resistance in circuit F500.

Is the repair complete?

--

Go to Step 27

--

1. Select TIP SWITCH 0 from the data list on the scan tool.
2. Turn the cruise control switch ON.

Does the scan tool display ACTIVE?

--

Go to Step 8

Go to Step 7

1. Disconnect the connector from the cruise control switch.
2. Connect a fused jumper wire between terminals A and B.
3. Turn the ignition switch to the ON position.

Does the scan tool display ACTIVE?

--

Go to Step 9

Go to Step 10

1. Select TIP SWITCH I from the data list on the scan tool.
2. Press and hold the SET/ACCEL button.

Does the scan tool display ACTIVE?

--

Go to Step 11

Go to Step 12

Replace cruise control switch. Refer to Steering Wheel and Column On Vehicle Service.

Is the replacement procedure complete?

--

Go to Step 27

--

1. Locate an open or high resistance in circuits X501 and/or FA300.
2. Repair the open or the high resistance in circuits X501 and/or FA300.

Is the repair complete?

--

Go to Step 27

--

1. Select CRUISE CONTROL.
2. Turn ON the ignition switch, keep the engine OFF.
3. Depress the brake pedal
4. Shift the transmission into Drive.
5. Release the brake pedal.

Does the scan tool display ALLOWED?

--

Go to Step 13

Go to Step 14

1. Disconnect the connector from the cruise control switch.
2. Connect a fused jumper wire between terminals B and D.

Does the scan tool display ACTIVE?

--

Go to Step 15

Go to Step 16

1. Prepare the vehicle for a road test.
2. Select VEHICLE SPEED.
3. Road test the vehicle and observe vehicle speed on the scan tool.

Does the scan tool display the vehicle speed?

--

Go to Step 17

Go to Step 18

1. Disconnect the connector from the cruise control module.
2. Turn ON the ignition switch
3. Depress the brake pedal, shift the transmission into drive and then release the brake pedal.
4. Use the DMM to measure the voltage between terminal D and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 19

Go to Step 20

Replace cruise control switch. Refer to Steering Wheel and Column On Vehicle Service.

Is the replacement complete?

--

Go to Step 27

--

1. Locate an open or high resistance in circuits X501 and/or FB300.
2. Repair the open or the high resistance in circuits X501 and/or FB300.

Is the repair complete?

--

Go to Step 27

--

1. Check for poor connections between the Electronic Brake/Traction Control Module (EBTCM) connector C1 terminal 6 and the cruise control module connector terminal K.
2. If OK, replace and program the cruise control module. Refer to Cruise Control.

Is the repair or replacement complete?

--

Go to Step 27

--

Check for current ABS DTCs 44 and 45.

Are current DTCs 44 and 45 set?

--

Go to Antilock Brakes

Go to Step 21

While monitoring the DMM, depress the brake pedal. Note: Repeat depressing the brake pedal several times to see if release switch sticks intermittently.

Is the measured voltage within the specified value?

B+

Go to Step 24

Go to Step 25

1. Remove the connector from the cruise control release switch.
2. Connect a fused jumper wire across terminals 1 and 2 of the connector.
3. Shift transmission into Drive.
4. Use the DMM to measure the voltage again at terminal D.

Is the measured voltage within the specified value?

B+

Go to Step 24

Go to Step 25

1. Disconnect the connector from the cruise control module.
2. Raise the drive wheels.
3. Turn On the ignition switch.
4. Use DMM, on the AC scale, to measure the voltage output between terminal K and a known good ground while rotating the left rear drive wheel.

Is the measured voltage within the specified value?

Greater than 1 VAC

Go to Step 22

Go to Step 26

1. Check for poor connections at the cruise control module.
2. If OK, replace and program the cruise control module.

Is the replacement complete?

--

Go to Step 27

--

1. Check for a possible short to B+ in circuit FP500.
2. If OK, replace the cruise control release switch.

Is the repair or replacement complete?

--

Go to Step 27

--

Replace the cruise control release switch.

Is the replacement complete?

--

Go to Step 27

--

Locate and repair poor connections or open circuit between automatic transmission switch connector terminal C, terminal 14 of connector C106, S231, and cruise control module connector terminal D.

Is the repair complete?

--

Go to Step 27

--

1. Locate and repair poor connections or open circuit in circuits PA900, PA901, PA10, and/or PA500.
2. Check terminal 46 of connector C200A.

Is the repair complete?

--

Go to Step 27

--

1. Connect all connectors and components that were disconnected.
2. Verify that the cruise control system operates properly.

Does the cruise control system operate properly?

--

System OK

Go to Step 1