Circuit Description
The cruise control module applies voltage to the magnetic clutch when the cruise control system is engaged. The circuit between the cruise control module and the magnetic clutch in the actuator is interrupted by the stop lamp switch whenever the brake pedal is pressed.
Diagnostic Aids
Check for the following:
| • | Stop lamp switch out of adjustment, or faulty. |
| • | Open in the cruise control magnetic clutch. |
| • | An open, short, or ground in the WHT/BLK, RED/GRN, RED/BLU, GRN/ORN, or RED/YEL wires. |
An intermittent malfunction may be caused by a fault in the magnetic clutch electrical circuit. Inspect the wiring harness and components for any of the following conditions:
| • | Backed out terminals |
| • | Improper mating of terminals |
| • | Broken electrical connectors locks |
| • | Improperly formed or damaged terminals |
| • | Faulty terminal to wire connections |
| • | Physical damage to the wiring harness |
| • | A broken wire inside the insulation |
| • | Corrosion of electrical connections, splices, or terminals |
Repair any electrical circuit faults that were found. Refer to Wiring Repairs in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests the resistance of the cruise control servo magnetic clutch circuit.
-
This step tests the stop lamp switch.
-
This step tests the cruise control actuator arm for free movement with the magnetic clutch de-energized.
-
This step tests the cruise control actuator arm for a malfunction with the magnetic clutch energized.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Cruise Control Schematics | ||||
1 | Did you perform the Diagnostic System Check - Cruise Control ? | -- | Go to Step 2 | |
Is the resistance within the specified range? | 35-45 ohms | Go to Step 3 | Go to Step 4 | |
3 |
Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 7 |
Does the resistance read infinite ohms while the pedal is pressed, and 0 ohms when the pedal is released? | -- | Go to Step 5 | Go to Step 9 | |
5 | Test the magnetic clutch control circuit between the cruise control module and the cruise control servo for an open or ground condition. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 6 |
6 |
Is the resistance within the specified range? | 35-45 ohms | Go to Step 7 | Go to Step 11 |
Does the actuator arm move freely in both directions? | -- | Go to Step 8 | Go to Step 13 | |
Does the actuator arm move? | -- | Go to Step 11 | Go to Step 10 | |
9 | Adjust or replace the stop lamp switch. Refer to Stop Lamp Switch Adjustment or Stop Lamp Switch Replacement . Is the adjustment or replacement complete? | -- | Go to Step 14 | -- |
10 | Inspect for poor connections at the harness connector of the cruise control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 12 |
11 | Inspect for poor connections at the harness connector of the cruise control servo. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 13 |
12 | Replace the cruise control module. Refer to Cruise Control Module Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- |
13 | Replace the cruise control servo. Refer to Cruise Control Servo Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- |
14 |
Does the CRUISE indicator lamp flash the same trouble code? | -- | Go to Step 2 | System OK |
