02 Suburban Cruise Control Problem

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Thread: 02 Suburban Cruise Control Problem

  1. #1
    Walking
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    02 Suburban Cruise Control Problem

    The cruise control just up and quit yesterday. It won't engage at all. A couple of weeks ago it had a problem and seemed to be kicking out occasionally. But, no longer. It is completely not working.
    We have about 85K miles on it, so way past any warranty service. Is there a way to check the switch itself? I can purchase the multi-function switch at the dealership, but it is fairly steep, and I would like to be sure that is the problem.
    There is no throttle interface, as it is all computer controlled.
    Thank you very much

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  3. #2
    7.0 Liter LS7 V8 Premium Member
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    Re: 02 Suburban Cruise Control Problem

    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

    Schematic Reference: Cruise Control Schematics

    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

  4. #3
    6.2 Liter LS9 Supercharged V8 member12's Avatar
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    Re: 02 Suburban Cruise Control Problem

    Yeah, I am not an expert here, but a friend of mine has a 2003 GMC Sierra Z71 that the cruise control switch broke....That little stalk that GM likes to put everything on is actually not as expensive as you might think. They fixed it in twenty minutes. You must be the 4th or 5th person I know of with a GM800 that had cruise control problems..Was there ever a recall on it?

    In an earlier post, I explained how I haggled labor cost at Gerry Lane to about $55 an hour (down from $75 an hour) on a more intensive repair, so it is possible to get a discounted price if you know a really nice service manager.
    Last edited by member12; 10-24-2005 at 07:11 PM.

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    Re: 02 Suburban Cruise Control Problem

    I am wondering the same thing on the 1984 Buick Park Avenue I am working on. The cruise light lights but the cruise control never engages. It sat for 2 years in my sisters driveway and she said when she parked it the cruise control worked. So what? Bad servo? All the connections seem good. The switch was replaced shortly before we got it.
    2008 Chevrolet Impala LS.

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  6. #5
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    Re: 02 Suburban Cruise Control Problem

    Sorry it took so long to get back.
    I am not able to locate the cruise control module. Where is it, and what does it look like?
    I pulled out the multifunction lever, and replaced it, not the problem. Darn.
    I have replaced the rear brake light bulbs with LED bulbs, but, they are new and working, also this problem is much newer.
    Thank you.

  7. #6
    Walking
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    Re: 02 Suburban Cruise Control Problem

    One more thing...My suburban has NO throttle cable. Is there any other hardware associated with the cruise control system?

  8. #7
    7.0 Liter LS7 V8 Premium Member
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    Re: 02 Suburban Cruise Control Problem

    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.

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    GMI Staff Member Premium Member shadams's Avatar
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    Re: 02 Suburban Cruise Control Problem

    Quote Originally Posted by GMCSonoma
    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.
    "Contrary to common belief, planning is complicated and is not run by complete idiots, so you'll just have to trust that the decisions were made on good information that's not made available to you."

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    Re: 02 Suburban Cruise Control Problem

    Quote Originally Posted by shadams
    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.

    parts catalog must be wrong...shows a #15040802 for the 2002 V8's...except RPO: KUP...hmmm!

  11. #10
    GMI Staff Member Premium Member shadams's Avatar
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    Re: 02 Suburban Cruise Control Problem

    Quote Originally Posted by GMCSonoma
    parts catalog must be wrong...shows a #15040802 for the 2002 V8's...except RPO: KUP...hmmm!
    KUP is the rpo for electronic throttle, which is what he says he has. They had cable on some 02's, etc(electronic throttle control) on others, and in 03 and up went to all etc.
    "Contrary to common belief, planning is complicated and is not run by complete idiots, so you'll just have to trust that the decisions were made on good information that's not made available to you."

  12. #11
    Walking
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    Re: 02 Suburban Cruise Control Problem

    So, beyond the multifunction switch, there is no other hardware for the cruise. Now, is there a troubleshooting guide for the ETC or KUP option? I am just lost on where to go now that I have changed out the multifunction stalk-unit. Unless it is to the dealer 50 miles away.
    Thank you greatly in advance.
    Paul

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