Schematic Reference: Cruise Control Schematics

DEFINITION: This diagnostic table is used to diagnose the cruise control system when the system is malfunctioning or inoperative.

Did you review the Cruise Control Description and Operation and the Symptoms - Cruise Control and perform the Cruise Control Self Diagnostic Test ?

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Go to Step 2

Go to Cruise Control Description and Operation

2

1. Turn OFF the ignition.
2. Disconnect the connector from the cruise control module.
3. Turn ON the ignition.
4. Measure the voltage of the cruise control module battery feed circuit. Refer to Measuring Voltage in Wiring Systems.

Is the voltage as specified?

Approx. 12 V

Go to Step 3

Go to Step 22

3

1. Turn OFF the ignition.
2. With the connector still disconnected from the cruise control module, test for continuity in the cruise control module ground circuit between the module and ground. Refer to Testing for Continuity in Wiring Systems.

Does continuity exist?

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Go to Step 4

Go to Step 23

4

1. Turn ON the ignition.
2. Measure the voltage of the cruise control module SET-DECEL and RES-ACCEL circuits. Refer to Measuring Voltage in Wiring Systems.

Is voltage as specified at either terminal?

Less than 1 V

Go to Step 6

Go to Step 5

5

1. Turn OFF the ignition.
2. Disconnect the cruise control switch assembly wiring harness connector.
3. Turn ON the ignition.
4. Measure the voltage of the cruise control module SET-DECEL and RES-ACCEL circuits again. Refer to Measuring Voltage in Wiring Systems.

Is voltage as specified at either terminal?

Less than 1 V

Go to Step 24

Go to Step 25

6

Measure the voltage of the cruise control module RES-ACCEL circuit while rotating and holding the cruise control switch in the RES-ACCEL position. Refer to Measuring Voltage in Wiring Systems.

Is the voltage as specified?

Greater than 9 V

Go to Step 9

Go to Step 7

7

1. Turn OFF the ignition.
2. Disconnect the cruise control switch assembly wiring harness connector.
3. Turn ON the ignition.
4. Measure voltage of the battery positive ignition feed circuit at the cruise control switch wiring harness connector. Refer to Measuring Voltage in Wiring Systems.

Is voltage as specified?

Approx. 12 V

Go to Step 8

Go to Step 26

8

1. Turn OFF the ignition.
2. Measure the resistance of the cruise control switch between the IGN input and the RES-ACCEL output while rotating and holding the switch in the RES-ACCEL position. Refer to Testing for Continuity .

Is the resistance as specified?

Approx. 470 ohms

Go to Step 27

Go to Step 24

9

Measure the voltage of the cruise control module SET-DECEL circuit while rotating and holding the cruise control switch in the SET-DECEL position. Refer to Measuring Voltage .

Is the voltage as specified?

Greater than 9 V

Go to Step 11

Go to Step 10

10

1. Turn OFF the ignition.
2. Disconnect the cruise control switch wiring harness assembly.
3. Turn ON the ignition.
4. Measure the resistance of the cruise control switch between the IGN input and the SET-DECEL output while rotating and holding the switch in the SET-DECEL position. Refer to Testing for Continuity in Wiring Systems.

Is the resistance as specified?

Approx. 470 ohms

Go to Step 28

Go to Step 24

11

1. Turn OFF the ignition.
2. Reconnect all connectors.
3. Turn ON the ignition.
4. Repeatedly press the cruise ON-OFF push button.

Does the CRUISE indicator, text and symbol in the instrument cluster display toggle between the on and off as the switch is pressed?

Go to Step 14

Go to Step 12

12

1. Turn OFF the ignition.
2. Disconnect the cruise control module display output circuits from the instrument cluster.
3. Turn ON the ignition.
4. Repeatedly press the cruise ON-OFF push button while measuring the voltage from the instrument panel (I/P) connector CRCTL-ON circuit. Refer to Measuring Voltage in Wiring Systems.

Does the voltage vary as specified?

Switch pressed: Approx. 12 V

Switch released: Approx. 7 V

Go to Step 29

Go to Step 13

13

1. Turn OFF the ignition.
2. Disconnect connector from the cruise control module.
3. Test for continuity of the CRCTL-ON signal circuit between the cruise control module wiring harness connector and the I/P wiring harness connector. Refer to Testing for Continuity in Wiring Systems.

Does continuity exist?

Go to Step 30

Go to Step 31

14

1. Turn OFF the ignition.
2. Disconnect the connector from the cruise control module.
3. Turn ON the ignition.
4. Measure the voltage of the stop lamp (switch A) output signal at the cruise control module wiring harness connector. Refer to Measuring Voltage in Wiring Systems.

Is the voltage as specified?

Less than 1 V

Go to Step 15

Go to Step 32

15

Measure the voltage of the cruise cancel relay switch output signal at the cruise control module wiring harness connector. Refer to Measuring Voltage in Wiring Systems.

Is the voltage as specified?

Approx. 12 V

Go to Step 16

Go to Step 33

16

Using a fused jumper wire, jumper the CR-ACT circuit from the cruise control module wiring harness connector to ground. Refer to Using Fused Jumper Wires in Wiring Systems.

Does the cruise control ACTIVE icon, text and symbol illuminate in the I/P display?

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Go to Step 18

Go to Step 17

17

1. Turn the ignition to OFF.
2. Disconnect the cruise control input circuits from the I/P.
3. Test for continuity of the CRCTL-ACT signal circuit between the cruise control module wiring harness connector and the I/P wiring harness connector. Refer to Testing for Continuity in Wiring Systems

Does continuity exist?

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Go to Step 29

Go to Step 34

18

1. Turn OFF the ignition.
2. Reconnect all connectors.
3. Raise up the rear of the vehicle and support on safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
4. Turn ON the ignition.
5. Back probe the vehicle speed input signal at the cruise control module with a voltmeter to ground. Refer to Probing Electrical Connectors in Wiring Systems.
6. Rotate the rear wheels by hand while observing the voltmeter.

Does the voltage vary as specified?

Varies from less than 1 V to greater then 10 V

Go to Step 19

Go to Step 35

19

1. Connect all connectors.
2. Drive the vehicle at approximately 65 km/h (40 mph) and rotate the cruise switch to the SET-DECEL position to set vehicle speed.

Does the cruise control system fail to maintain the vehicle speed?

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Go to Step 20

System OK

20

Inspect the condition and adjustment of the cruise control cable. Refer to Clutch Pedal Cruise Control Release Switch Adjustment .

Is the cable OK?

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Go to Step 21

Go to Step 36

21

Perform the switch diagnostic. Refer to Cruise Control Self Diagnostic Test .

Does the test highlight a fault within the system?

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Refer to fault as indicated by the cruise control self test

Go to Step 30

Repair the open in the battery positive voltage circuit between the battery and the cruise control module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 37

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Repair an open in the cruise control module ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 37

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Replace cruise control switch assembly. Refer to Cruise Control Switch Replacement .

Did you complete the repair?

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Go to Step 37

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Test and repair a short to voltage in cruise control module SET-DECEL and/or RES-ACCEL circuits. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 37

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Test and repair an open in the battery positive ignition feed circuit between the cruise control switch wiring harness connector and the fuse. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 37

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Test and repair an open the RES-ACCEL circuit between the cruise control switch and the module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 37

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Test and repair an open in the SET-DECEL circuit between the cruise control switch and the module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 37

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

Did you complete the repair?

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Go to Step 37

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

Did you complete the repair?

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Go to Step 37

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Test and repair an open in the CRCTL-ON signal circuit between the cruise control module wiring harness connector and the I/P wiring harness connector. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 37

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Test the operation of the stop lamp switch (switch A). Look for improper adjustment of the switch. Repair as necessary. Refer to Cruise Release Switch Adjustment or Cruise Control Release Switch Replacement .

Did you complete the repair?

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Go to Step 37

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Test the operation of the electrical release switch (switch B) and clutch switch if equipped and test for an open between these switches and the cruise control module. Look for improper adjustment of the switches. Repair as necessary. Refer to Cruise Release Switch Adjustment or Cruise Control Release Switch Replacement .

Did you complete the repair?

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Go to Step 37

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Test and repair an open in the CRCTL-ACT circuit between the I/P and the cruise control module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 37

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Test for an open or short to ground in the vehicle speed signal circuit between the PCM and the cruise control module. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Did you complete the repair?

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Go to Step 37

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Adjust or replace the cruise control cable as necessary. Refer to Cruise Control Cable Replacement .

Did you complete the repair?

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Go to Step 37

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 1