Schematic Reference Cruise Control Schematics

DEFINITION: The cruise control system operates properly, but the CRUISE Indicator does not illuminate during cruise control operation.

1

Did you perform the Cruise Control Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Cruise Control

1. Install a scan tool.
2. Start the engine.
3. Carefully drive the vehicle at a speed greater than 40 km/h (25 mph).
4. Engage the cruise control.
5. With a scan tool, observe the Cruise Requested parameter in the powertrain control module (PCM) data list.

Does the scan tool display Yes?

Go to Step 3

Go to Step 4

1. Turn OFF the ignition.
2. Turn ON the ignition, with the engine OFF.
3. Observe the CRUISE indicator on the instrument cluster (IPC) during the bulb check.

Does the CRUISE indicator illuminate during the bulb check?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 9

1. Turn OFF the ignition.
2. Disconnect the cruise control module.
3. Connect a 3 amp fused jumper between the cruise engaged signal circuit and a good ground.
4. Carefully drive the vehicle at a speed greater than 40 km/h (25 mph).
5. With a scan tool, observe the Cruise Requested parameter in the powertrain control module (PCM) data list.

Does the scan tool display Yes?

Go to Step 7

Go to Step 5

Test the cruise engaged signal circuit for a open, high resistance or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 6

Inspect for poor connections at the harness connector of the powertrain control module (PCM). 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 11

Go to Step 8

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 11

Go to Step 10

Important: The powertrain control module (PCM) must be reprogrammed after replacement. Refer to Powertrain Control Module Programming in Engine Controls.

Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 4.6L.

Did you complete the replacement?

Go to Step 11

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Replace the instrument cluster (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console.

Did you complete the replacement?

Go to Step 11

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Replace the cruise control module. Refer to Cruise Control Module Replacement .

Did you complete the replacement?

Go to Step 11

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2