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Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, Answer the 1Million Question: Where is the air ride control relay located? in Cadillac Escalade Forums; What fuse is it?...
  1. #106
    ESKY02 is offline Cadillac Owners Fanatic
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    What fuse is it?

  2. #107
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Power to the air compressor relay is from one of those MAXI fuses in the fuse-relay box under hood. #1 or 2 but don't quote me on that one... Easy to find which one is shot with your test light.

  3. #108
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Checked them all they are all good. Im stuck. I dont understand why i dont get a spark or click now.

  4. #109
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    The compressor is most likely shot. You can leave the jumper in the relay socket and check if you have power at the round plug right beside the compressor. If you do plan on removing the compressor and replace it.

  5. #110
    ESKY02 is offline Cadillac Owners Fanatic
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    So if i dont have power then the compressor is shot? Its fine if it is i have a new one ready to go in.

  6. #111
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    luxurylife33 is offline Cadillac Owners Connoisseur
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    just remove the compressor and hardwire it.... looks like a fairly simple removal

  7. #112
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    my truck doesnt sag. it sits level. I hooked my tandem trailer to it to get it to sag and still nothing. When i unhooked the trailer it came back to the level postion. Any thoughts on that?

  8. #113
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    it has to be sagging, its really not easy to see it, but if you measure it, you'd be surprised. When my shocks are manually filled with air, it sits 3.5" higher than when I hook up my trailer with no air.

    Manually pump air via the relay jumper take some measurements from the tow hitch to the ground. Drive around for a little bit to get rid of some air and then hook the trailer up and measure agin.... you'll notice a big change. Its hard to see by eye.

  9. #114
    WSLN 6 is offline Cadillac Owners Member
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Any more progress? I have the exact same problem with my ESV as does my buddy with his Denali. We swapped SCM's, but that didn't help. Probing the light blue wire at the SCM will activate the compressor, but that's as far as we got so far.

  10. #115
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Good to know! I don't have access to another SCM for that test. I'm gonna look into this tonight, no check engine light on for the last week, time to move on to another issue... Good idea to measure from the hitch receiver to the ground! I also didnt notice the sagging from the back end till I started reading the forums here and realizing the air compressor is supposed to raised the back end automatically.

  11. #116
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Had a few hours of free time to finally have a look at the SCM today, here's the data I collected:

    Connector Part Information
    12110626
    8-Way F Metri-Pack 280 Series (GRY)


    Pin
    Wire Color
    Circuit No.
    Function

    A
    LT BLU/WHT
    1116
    Right Front Suspension Damper Solenoid Control (1.9 Volts)

    B
    DK GRN
    1119
    Right Rear Suspension Damper Solenoid Low Reference (0 Volts)

    C
    BLK
    1450
    Ground OK

    D
    ORN
    2440
    Battery Positive VoltageOK

    E
    BLK
    1450
    GroundOK

    F
    GRY
    1113
    Left Front Suspension Damper Solenoid Low Reference(0 Volts)

    G
    GRY
    1117
    Right Front Suspension Damper Solenoid Low Reference(0 Volts)

    H
    DK GRN
    1115
    Left Rear Suspension Damper Solenoid Low Reference(0 Volts)

    Suspension Control Module - C2

    Connector Part Information
    12110244
    24-Way F Micro-Pack (PNK)


    Pin
    Wire Color
    Circuit No.
    Function

    A1
    --
    --
    Not Used

    A2
    WHT
    790
    PWM Serial Data - w/VSES

    --
    --
    Not Used - w/o VSES

    A3
    GRY
    791
    PWM Serial Data - w/VSES

    --
    --
    Not Used - w/o VSES

    A4-A6
    --
    --
    Not Used

    A7
    WHT
    1294
    Variable Effort Steering Actuator Supply Voltage6.8mV

    A8
    BRN
    1295
    Variable Effort Steering Actuator Control6.8mV

    A9
    GRY
    416
    5 Volt ReferenceOK

    A10
    LT BLU
    2248
    Real Time Damping Compressor Relay ControlSTARTS COMPRESSOR WHEN GROUNDED

    A11
    --
    --
    Not Used

    A12
    LT BLU/

    WHT
    1107
    Left Front Suspension Damper Solenoid Control1.7mV

    B1
    DK BLU/

    WHT
    1118
    Right Rear Suspension Damper Solenoid Control1.5mV

    B2-B4
    --
    --
    Not Used

    B5
    DK BLU
    2249
    Real Time Damping Compressor Exhaust Control26mV

    B6-B7
    --
    --
    Not Used

    B8
    DK BLU/

    WHT
    1126
    SCM Class 2 Serial Data

    B9
    --
    --
    Not Used

    B10
    BLK
    407
    Low Reference6.8mV

    B11-B12
    --
    --
    Not Used

    Connector Part Information
    121102206
    24-Way F Micro-Pack


    Pin
    Wire Color
    Circuit No.
    Function

    A1
    PNK/WHT
    1101
    Damping Lift/Dive Signal11.40V

    A2
    TAN/WHT
    1207
    Left Front Suspension Position Sensor Signal2.71v

    A3
    PPL/WHT
    1205
    Left Front Suspension Position Sensor Voltage Reference4.98V

    A4
    TAN/WHT
    1213
    Right Front Suspension Position Sensor Signal2.56V

    A5
    LT GRN/

    WHT
    1210
    Left Rear Suspension Position Sensor Signal1.77V

    A6
    RED/BLK
    1208
    Left Rear Suspension Position Sensor Voltage Reference4.98V

    A7
    LT GRN/

    WHT
    1216
    Right Rear Suspension Position Sensor Signal1.88V

    A8
    LT BLU
    1059
    Steering Wheel Position Sensor Signal 3.88V

    A9
    GRY
    705
    5 Volt ReferenceOK

    A10
    DK GRN/

    WHT
    817
    Vehicle Speed Signal10.57V

    A11
    --
    --
    Not Used

    A12
    DK BLU/

    WHT
    1114
    Left Rear Suspension Damper Solenoid Control1.6mV

    B1
    BRN
    541
    Ignition 3 VoltageOK

    B2
    LT BLU/

    BLK
    1206
    Left Front Suspension Position Sensor Low Reference6.8mV

    B3
    PPL/WHT
    1211
    Right Front Suspension Position Sensor Voltage Reference4.98V

    B4
    LT BLU/

    BLK
    1212
    Right Front Suspension Position Sensor Low Reference6.8mV

    B5
    LT GRN/

    BLK
    1209
    Left Rear Suspension Position Sensor Low Reference6.8mV

    B6
    RED/BLK
    1214
    Right Rear Suspension Position Sensor Voltage Reference4.98V

    B7
    LT GRN/

    BLK
    1215
    Right Rear Suspension Position Sensor Low Reference1.97V

    B8
    ORN/BLK
    556
    Low Reference1.97V

    B9
    ORN/BLK
    1057
    Low Reference6.8mV

    B10
    --
    --
    Not Used

    B11
    TAN
    2252
    Leveling Pressure Sensor Signal0.429V

    B12
    --
    --
    Not Used

    All above data collected with ignition on and suspension at zero PSI pressure. I disconnected the 2 sensors for the rear level indicators by unscrewing the 10mm pivot of the rod at the sensor itself. Both are registering within range (0.5 - 4.8Volts). From what I observed, I could not get the exhaust solenoid to do anything by applying ground to B5 (DK BLUE) at the PNK connector. Either with compressor on or off, it doesnt affect the output of air to the shocks. For reference, I manually (I got a switch inside the cab) activated the compressor for about a minute, with key on, here's the data from that test:

    -Height from under the hitch receiver: 16 3/4" (I still have the OEM wheels)
    -Pressure sensor signal (B11 TAN @ LT BLUE connector): 2.19V
    -Rear suspension position sensor signal @ A5+A7 LT BLU 1.23V-1.14V

    I find those value a bit on the low end of the scale. The back end of the truck was waaaay high, heck it looked like a souped-up cheapo pinto wagon ready for the dragstrip! I can't really picture how the system can reach the high end of the position+pressure sensors.

    So far all checks ok. I'm starting to fear the worst! This will definately require a trip to sumone with a Tech2 scanner to clear DTC's. I might have a code stored in memory from the worn out shocks, thats preventing the system from functionning... I'm gonna sleep on it

  12. #117
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    you really think stored codes would prevent the scm from funcitioning? it makes sense since the dealers want you to bring the car in for service... interesting... i never thought about that.... im still waiting on my buddy to see if he can get me an appointment with his friend/service manager at the chevy dealer...

    i will test everything again over the weekend, i been swamped with work.... hopefully sunday i will get a chance to do the tests, but im pretty sure everything is in check. You got me thinking about the stored code issue....

  13. #118
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    I slept on the problem, and I got me thinking there's only 3 possible codes we have seen listed for the ALC (Automatic Level Control).
    DTC C0655 - Air compressor relay - motor non operational
    DTC C0660 - Solenoid valve operation
    DTC C0711 - Pressure sensor indication.

    I was under the impression that a run time of more than 5 minutes from the compressor witout any change in the air pressure sensor's output or a change in the level height, would result in a DTC and disabling of the ALC system. Actually the compressor does shut down, but only till the next time the ignition is cyled off and then on. I'm pretty sure all is well with those 3 codes. Then I found this info, on top of every diagnostic for the ALC, you gotta clear DTC C0870 first, which is reference voltage to all sensors,including the dreaded steering position sensor! Here is the info:

    DTC C0870
    Circuit Description
    The Electronic Suspension Control (ESC) module provides a common regulated voltage of approximately 5 volts to all four of the body-to-wheel suspension position sensors, air pressure sensor and the steering handwheel position/speed sensor. The ESC module monitors this reference voltage for any malfunctions that could prevent it from outputting a regulated 5 volts.

    Conditions for Running the DTC
    Continuously with the ignition on.

    Conditions for Setting the DTC
    The ESC module senses a sensor reference voltage of less than 4.0 volts or greater than 6.0 volts.

    Action Taken When the DTC Sets
    Disable all EVO outputs.
    Disable all compressor leveling functions, and assume default pressure.
    Disable all suspension damper solenoid outputs.
    The SERVICE RIDE CONTROL message will be displayed.
    Stores a DTC C0870 in the ESC module memory.
    Conditions for Clearing the DTC
    The ESC module senses the correct voltage output to the suspension position sensors upon the next ignition cycle.
    Using a scan tool.
    A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
    Diagnostic Aids

    Important
    Ignition cycle counting is used by the ESC module to detect faults in the system. The objective is to eliminate false/intermittent codes while maintaining an acceptable level of system performance. The operation of the ignition cycle counting requires that a fault condition be present for four consecutive ignition cycles before it will set the fault code and display the "SERVICE RIDE CONTROL" message. If a fault code is present (without a fault being current), the system will go into one or more degraded modes without displaying a message. Resetting the ignition cycle counter is done by clearing codes with a scan tool. Clearing codes will override ignition cycle counting for one ignition cycle. Therefore, a fault condition will set the fault code immediately if it occurs on the first ignition cycle after the codes are cleared.


    The following conditions may cause a malfunction to occur:
    A short to voltage in any one of the body-to-wheel suspension position sensor reference voltage circuit.
    A short to ground in any one of the body-to-wheel suspension position sensor reference voltage circuit.
    If the circuit is shorted to ground, the scan tool will display all suspension position sensor voltage as zero.
    If the circuit is shorted to an unwanted voltage source, the scan tool may display all suspension position sensor voltage as that voltage.
    A short to voltage in the 5 volt reference of the air pressure sensor.
    A short to ground in the 5 volt reference of the air pressure sensor.
    A short to voltage in the 5 volt reference of the steering handwheel position/speed sensor.
    A short to ground in the 5 volt reference of the steering handwheel position/speed sensor.
    A intermittent malfunction or DTC may cause a random firm/soft ride condition.
    Test Description
    The numbers below refer to the step numbers on the diagnostic table.

    Tests all suspension position sensors reference voltage circuits.

    Tests the 5 volt reference circuit of the steering handwheel position/speed sensor for a short to ground and a short to voltage.

    Tests the 5 volt reference circuit of the air pressure sensor for a short to ground and a short to voltage.

    Clear DTCs and checks to see if DTC will reset.

    Step
    Action
    Yes
    No

    Schematic Reference: Suspension Controls Schematics Automatic Level Control Suspension Schematics Steering Controls Schematics

    1
    Did you perform the RTD Diagnostic System Check?
    Go to Step 2
    Go to Diagnostic System Check - Real Time Damping

    2
    Install a scan tool.
    Turn ON the ignition, with the engine OFF.
    With a scan tool, observe the suspension position sensors, air pressure sensor, and steering wheel position sensor 5 volt reference data parameters in the ESC module data list.
    Does the scan tool indicate that all the above mentioned data parameters are less than 4 volts or greater than 6 volts?
    Go to Step 3
    Go to Diagnostic Aids

    3

    Test all 4 body-to-wheel suspension position sensor 5 volt reference circuits for a short to ground and a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

    Did you find and correct the condition?
    Go to Step 7
    Go to Step 4

    4
    Test the steering handwheel position/speed sensor 5 volt reference circuit for a short to ground and a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

    Did you find and correct the condition?
    Go to Step 7
    Go to Step 5

    5
    Test the air pressure sensor 5 volt reference circuit for a short to ground and a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

    Did you find and correct the condition?
    Go to Step 7
    Go to Step 6

    6
    Replace the ESC module. Refer to Electronic Suspension Control Module Replacement .

    Did you complete the replacement?
    Go to Step 7
    --

    7
    Use the scan tool in order to clear the DTCs.
    Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
    Does the DTC reset?
    Go to Step 2
    System OK

    This code will disable the ALC. I included a pic of the old shocks I removed, and the SCM module with ID beside the plugs for easier troubleshooting.





    I stopped by another GM dealer (non-cadilllac) where I got my parts for my Blazer K5 build. They will scan and check the SCM for $35. Not too bad... I wanted to borrow the Tech 2 scanner on site, they didnt want... I'll wait for the outcome from your scan session before going that route.

  14. #119
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    sk7
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Wiring diagram of the steering input module:



    For the sake of science, I unplugged the SCM and turned the ignition on, yipeee a new error message, service ride control!!! There is communication happening afterall... I was worried my out of commission EBCM would overide all error messages (except low fuel level). I will attempt to fool the SCM into thinking all reference 5 volts is ok, if I can find where to do so. I can't see where that reference voltage is for the pressure sensor? More updates to come...

  15. #120
    ESKY02 is offline Cadillac Owners Fanatic
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    Re: Answer the 1Million Question: Where is the air ride control relay located?

    Hey guys i havnt done anymore testing. BUT i was talking to a guy at my work and we have a Tech 2 scanner for a work trucks. So this should really help me find the problem...correct?

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