Question about Chevrolet Suburban 1500

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Once starting on the highway and up to speed my cruise control will work the first time but if I have to slow down and then try to resume or set the control at a new speed I am unable to. Just wondering if there is something quick to check.

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  • Chevrolet Master
  • 17,970 Answers

Cruise Control Inoperative/Malfunctioning (WO/ETC) - Diagnostic Aids

Important: Perform the following in order to avoid misdiagnosis.

Inspect for proper operation of brake lamps and clutch switch, if equipped.
Inspect for proper operation of the transmission range switch.
Inspect throttle linkage for mechanical binding which could cause the system to malfunction.
Inspect cruise control cable adjustment, should have minimum slack.
EMI on the speed sensor signal circuit may cause erratic cruise control operation.

Conditions for Enabling Cruise Control: The vehicle speed is greater than 40 km/h (25 mph).

Step / Action / Value(s) / Yes / No

1 Did you perform the Cruise Control Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Cruise Control

2 Turn OFF the ignition.
Disconnect the cruise control module.
Turn ON the ignition, with the engine OFF.
Probe the ignition positive voltage circuit of the cruise control module with a test lamp that is connected to a good ground.
Does the test lamp illuminate?
Go to Step 3
Go to Step 30

3 Probe the ignition positive voltage circuit of the cruise control module with a test lamp that is connected to the ground circuit of the cruise control module.
Does the test lamp illuminate?
Go to Step 4
Go to Step 31

4 Turn ON the ignition, with the engine OFF.
Turn OFF the cruise control.
Probe the on/off, the set/coast, and the resume/accelerate signal circuits with a test lamp that is connected to a good ground.
Does the test lamp illuminate on any of the circuits?
Go to Step 14
Go to Step 5

5 Turn ON the ignition, with the engine OFF.
Turn ON the cruise control.
Probe the cruise control on/off signal circuit with a test lamp that is connected to a good ground.
Does the test lamp illuminate?
Go to Step 6
Go to Step 15

6 Probe the cruise control set/coast signal circuit with a test lamp that is connected to a good ground.
Press and hold the SET/COAST switch.
Does the test lamp illuminate?
Go to Step 7
Go to Step 17

7 Probe the cruise control resume/accelerate signal circuit with a test lamp that is connected to a good ground.
Press and hold the RESUME/ACCEL switch.
Does the test lamp illuminate?
Go to Step 8
Go to Step 18

8 Probe the TCC/brake, cruise release signal circuit with a test lamp that is connected to a good ground.

Does the test lamp illuminate?
Go to Step 11
Go to Step 9

9 Press the brake pedal while monitoring the test lamp.

Does the test lamp illuminate?
Go to Step 21
Go to Step 10

10 Probe the stoplamp switch signal circuit with a test lamp that is connected to a good ground.

Does the test lamp illuminate?
--
Go to Step 22
Go to Step 11

11 Press the brake pedal while monitoring the test lamp.

Does the test lamp illuminate?
--
Go to Step 12
Go to Step 23

12 Probe the cruise engaged signal circuit with a DMM that is connected to a good ground.

Does the voltage measure near the specified value?
B+
Go to Step 13
Go to Step 24

13 Check the speedometer for proper operation.

Does the speedometer operate properly?
--
Go to Step 25
Go to Symptoms - Instrument Panel, Gages and Console in Instrument Panel, Gages, and Console

14 Test the circuit that illuminated the test lamp for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 36
Go to Step 28

15 Test the cruise control on/off signal circuit for an open, high resistance or short to ground and the set/coast, resume/accel signal circuits for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 36
Go to Step 16

16 Test the ignition positive voltage circuit of the cruise control switch for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 36
Go to Step 28

17 Test the set/coast switch signal circuit for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 36
Go to Step 28

18 Test the resume/accelerate switch signal circuit for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 36
Go to Step 28

19 Test the TCC/ brake, cruise release signal circuit for an open or a high resistance . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 36
Go to Step 26

20 Test the TCC/ brake, cruise release signal circuit for an open or a high resistance between the CPP switch and the cruise control module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 36
Go to Step 32

21 Test the TCC/ brake, cruise release switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 36
Go to Step 26

22 Test the stoplamp switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 36
Go to Step 26

23 Test the stoplamp switch signal circuit for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 36
Go to Step 26

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

Did you find and correct the condition?
Go to Step 36
Go to Step 27

25 Test the speed sensor circuit for an open or a high resistance between the PCM and cruise control module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
Go to Step 36
Go to Step 29

26 Inspect for poor connections at the harness connector of the stop lamp switch. 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 36
Go to Step 33

27 Inspect for poor connections at the harness connector of the 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 36
Go to Step 34

28 Inspect for poor connections at the harness connector of the cruise control switch. 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 36
Go to Step 35

29 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 36
Go to Step 36

30 Repair the ignition positive voltage circuit of the cruise control module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
Go to Step 36
--

31 Repair the ground circuit of the cruise control module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
Go to Step 36
--

32 Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Did you complete the replacement?
Go to Step 36
--

33 Important: The PCM must be reprogrammed after replacement. Refer to Powertrain Control Module (PCM) Programming in Engine Controls - 4.8L, 5.3L 6.0L.

Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 4.8L, 5.3L 6.0L.

Did you complete the replacement?
Go to Step 36
--

34 Replace the cruise control switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Did you complete the replacement?--
Go to Step 36

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

Did you complete the replacement?
--
Go to Step 36
--

36 Operate the vehicle within the conditions for cruise control operation.

Does the cruise control system operate correctly?
--
System OK
Go to Step 2
END TEST

Posted on Jul 12, 2010

  • ZJ Limited
    ZJ Limited Jul 12, 2010

    Keep in mind that the cruise module is on the driver's side firewall,
    above the brake
    booster... it has a cable coming from it going to the throttle body.
    Actually the trucks/suv's with electronic throttle do not have any
    cables, the pcm and tac modules operate the cruise control. No extra
    crusie control module.



    Hope helps.





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?€¢
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?€¢
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-see photo

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Once you have turned your cruise control on accelerate to desired speed press SET button on right hand side of steering wheel before lifting foot from accelerator, then remove foot from accelerator. pushing RESUME button will deactivate cruise control without turning it off. Then when clear of traffic push resume again to activate cruise control. It will automatically resume to previous set speed.

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At a steady highway speed press the ON switch, (at the left hand side of the horn) This will activate and turn the speed control system ON...

Then you have to set and adjust your desired speed...

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Stepping on the brake pedal at any time will deactivate the system.. If you step on the brake, and then want to return to your previous set cruising speed... All you have to do is press resume...

I hope this has helped you? You can find detailed speed control activation instructions in your 2005 Ford Focus Owners manual.. If you did not receive your owners manual when you bought the vehicle.. You can purchase one at your local Ford, Lincoln or Mercury dealership..

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