For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

1. Install the scan tool.
2. Attempt to establish communications with the cruise control module.

Does the scan tool communicate with the cruise control module?

--

Go to Step 2

Go to Step 3

2 | Access DTCs using the scan tool. Is a current DTC 55 set? | -- | Go to Step 4 | Go to Step 5
3 | Go to Scan Tool Does Not Communicate with Cruise Control Module in Wiring Systems for diagnosis. Did you find and correct the condition? | -- | Go to Step 5 | --
4 | Go to DTC 55 Cruise Control Module Malfunction for diagnosis. Did you find and correct the condition? | -- | Go to Step 5 | --
5 |

1. Drive the vehicle above 25 mph.
2. Turn the cruise switch ON.
3. Press on the SET/ACCEL button.
4. Remove foot from accelerator pedal.

Normal Results: Vehicle maintains set speed.

Does the cruise control engage and maintain set speed?

--

Go to Step 7

Go to Step 6

6 | Go to Cruise Control Inoperative for diagnosis. Did you find and correct the condition? | -- | Go to Step 5 | --
7 |

1. Press and hold the SET/ACCEL button until speed is increased by 4 to 5 mph.
2. Release the SET/ACCEL button.

Normal Results: Vehicle accelerates and maintains a new higher set speed.

Does the vehicle accelerate and maintain the new higher set speed?

--

Go to Step 9

Go to Step 8

8 | Go to Does Not Resume, Accelerate, or Tap Up or Down for diagnosis. Did you find and correct the condition? | -- | Go to Step 5 | --
9 |

1. Press and hold the RESUME/DECEL button until vehicle speed decreases by 4 to 5 mph.
2. Release the RESUME/DECEL button.

Normal Results: Vehicle decelerates and maintains a new lower set speed, provided that speed is above 25 mph.

Does the vehicle decelerate and maintain the new lower set speed?

--

Go to Step 10

Go to Step 8

10 | Press the brake pedal slightly. Normal Results: Cruise control disengages. (Memory is unchanged.) Does the cruise control disengage? | -- | Go to Step 12 | Go to Step 11
11 | Go to Cruise Control Does Not Disengage with Brake Pedal for diagnosis. Did you find and correct the condition? | -- | Go to Step 5 | --
12 | Press the cruise control RESUME/DECEL button once and release. Normal Results: Vehicle accelerates to and maintains previous set speed. Does the vehicle accelerate to and maintain previous set speed? | -- | Go to Step 13 | Go to Step 8
13 | Press the SET/ACCEL button once (tap-up) and release (less than 3/4 of a second). Normal Results: Vehicle speed increases by 1 mph and maintains new set speed. Does the vehicle speed increase by 1-4 mph and maintain new speed? | -- | Go to Step 14 | Go to Step 8
14 | Press the RESUME/DECEL button once (tap-down) and release (less than 3/4 of a second). Normal Results: Vehicle speed decreases by 1 mph and maintains new set speed. Does the vehicle speed decrease by 1-4 mph and maintain new speed? | -- | Go to Step 15 | Go to Step 8
15 | Set the cruise switch to OFF. Normal Results: Cruise control disengages with memory unchanged. The cruise control set memory is erased when you turn off the ignition switch. Does the cruise control disengage? | -- | System OK | --