Question: ITBC 2011 GMC YUKON DENALI - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 07-24-2019, 12:48 AM   #1 (permalink)
SnyderMatthew27
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ITBC 2011 GMC YUKON DENALI

Please forgive me for coming to a Diesel Forum to ask question about non-diesel truck. If you could spare me the mercy I have nowhere else to turn. In my internet searches for a solution to my problem it seemed a common denominator for trailer plug troubleshooting was that the Diesel Place was the where lost souls went to find peace. So without further ado;

I have the factory integrated trailer brake on my 2011 GMC Yukon Denali with the Tow Package. After a brief investigation I have found the following..

I have no DIC for gain adjustment when pressing + or - on the controller itself when connected to a trailer or not, after connecting to a trailer the DIC doesn't display "Trailer Connected" message, the fuses are good and installed (30a and 40a), I found one wire taped up and not connected beneath master brake cylinder under hood (it's my understanding this is to be run to Stud #2 on fuse box to apply 12v signal to trailer aux battery), I found another wire taped up and not connected to anything on driver side of fuse box (it's my understanding this is the power signal to the controller itself to be ran to Stud #1) there is currently a wire connected to Stud #1 on fuse block, all three wires in question are red with black stripe, both stud #1 & 2 have ~12v+ on on them. When I connect wires as I believed them to be connected I was able to get 12v between 1 o'clock (+) and 7 o'clock (-) pins on male trailer plug at bumper. Without connecting wires as described there was no signal on these pins. The lights have all been operational no problem. Going from 5 o'clock pin (brake signal) to 7 o'clock pin (-) I get a pulsating 3.5v to 0v.. (it's my understanding this is the module looking for a trailer to be connected), is this too high of a voltage? How much resistance is this looking for I have about 2 ohms on the trailer brake circuit with a tandem axle electric brake system.

Does anyone know the required resistance for the truck to 'sense' a trailer so I could "mock" a connection with a resistor? Should I see some info on the DIC when pressing + or - on controller without a trailer connected? Does this seem like it could be the relay located beneath the spare tire on the truck, or perhaps the module? Maybe the controller in the dash itself? Has any of you experienced this before? What types of readings should I be seeing on the back side of the controller in the dash? Should the wires under the hood be connected in the fashion I described or am I missing something? I understand I should have some voltage at trailer brake pin that is how the truck recognized it's connected but 3.5v seems very high for that.. any assistance would be greatly appreciated.. I would think that the truck had never had the power wires connected under the hood I am left to believe this has never been used before therefore wouldn't understand why it shouldn't function now (aside from corrosion and poor connection) However I am not looking to dump hundreds of dollars into this to keep the ITBC I just think it would be nice over switching to an aftermarket on and skipping the hassle. I have been into the dealer and without turning it over to them which could be thousands in simply labor alone I am hoping to repair this myself otherwise will be installing aftermarket before our 3600 mile travel trailer towing journey and giving up with attempting to restore to its factory glory as I did with the autoride system.

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2011 GMC Yukon Denali (Gasser) with the Tow Package

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Old 07-24-2019, 08:28 AM   #2 (permalink)
heymccall
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Easiest tester for brake output is to connect a car headlamp to the blue and white wires (5 & 7 o'clock).
With that in there, the system should be satisfied, and the lamp will change intensity both on manual apply and normal braking.

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Originally Posted by GetSome8.1HD
Its not like I said I enjoyed reading Good Housekeeping while taking a candle lit bubble bath then proceeding to using a loofah with exfoliating creams all while thinking about you . Now THAT would be creepy
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Old 07-24-2019, 11:01 AM   #3 (permalink)
heymccall
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As for coming to "diesel" site, I'd like to remind you that we don't just talk diesel. Heck, I think I have more GM gassers than diesels anyways.

2 ohm on a tandem axle trailer, for brake circuit resistance, sounds wrong. It should be closer to 1 ohm.
But, just 2 working magnets (2 ohm) should be sufficient to enable the ITBC.
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'13 Hyundai Genesis Coupe handshaker
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Quote:
Originally Posted by GetSome8.1HD
Its not like I said I enjoyed reading Good Housekeeping while taking a candle lit bubble bath then proceeding to using a loofah with exfoliating creams all while thinking about you . Now THAT would be creepy
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Old 07-24-2019, 11:06 AM   #4 (permalink)
heymccall
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This thread is relevant
https://www.dieselplace.com/forum/76...ting-help.html

Except, I believe a 2011 will not have a pressure switch on the master cylinder. Trailer brake force is determined, on later than '10 trucks, by a rheostat in the stop lamp switch assy.
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Brian
'13 Hyundai Genesis Coupe handshaker
'14 Peterbilt 337 handshaker
Quote:
Originally Posted by GetSome8.1HD
Its not like I said I enjoyed reading Good Housekeeping while taking a candle lit bubble bath then proceeding to using a loofah with exfoliating creams all while thinking about you . Now THAT would be creepy
Member #21 of the OiO association

Last edited by heymccall; 07-24-2019 at 11:08 AM.
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Old 07-24-2019, 12:15 PM   #5 (permalink)
Ron Nielson
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Here is additional information - and this is specifically for my 2008 model - and some testing steps that may benefit you.



DTC C0870, C1112, C1113, C1114, or C1119

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0870 00: Device Voltage Reference Output 1 Circuit.
DTC C1112 00: Trailer Brake Control Relay Low Control Circuit.
DTC C1113 01: Trailer Brake Control Relay High Control Circuit Short to Battery.
DTC C1114 00: Trailer Brake Control Solenoids Control Circuit.
DTC C1119 00: Trailer Brake Control Relay Feedback Circuit.

Diagnostic Fault Information

pict.gif

Circuit System Description

The trailer brake control relay receives inputs from the trailer brake control module (TBCM), these inputs are used to determine the amount of voltage the relay will supply to the trailer brakes.

Conditions for Running the DTC

Ignition ON.
Battery voltage is 9.5-17 volts.
The module is powered up and completes initialization.

Conditions for Setting the DTC

C0870 00

The TBCM circuit reference voltage for the trailer brake control relay is below 4.8 volts or above 5.2 volts.

C1112 00

The TBCM detects a short to ground, open or a short to voltage on the integrated trailer brake relay control active low circuit.
The TBCM detects an open in the battery positive voltage circuit to the trailer brake control relay.
The TBCM detects an open in the ground circuit to the trailer brake control relay.
The TBCM detects a short to ground or open in the solid state relay enable circuit.

C1113 01

The TBCM detects a short to voltage in the solid state relay enable circuit.
The TBCM detects a short to voltage in the trailer brake output supply voltage control circuit.

C1114 00

The TBCM detects a short to ground, open or a short to voltage on the solid state relay output circuit.

C1119 00

The TBCM detects a short to ground, open or a short to voltage on the relay feedback circuit.

Action Taken When the DTC Sets

The trailer brake control will be disabled for the remainder of the ignition cycle.
The driver information center will display Service Trailer Brake System.

Conditions for Clearing the DTC

The condition for the DTC is no longer present.
The TBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Circuit/System Verification

Important: These diagnostics are based on having no trailer connected.

Ignition ON, observe the scan tool trailer brake controls user gain parameter. The reading should be between 0-100 percent, and change with operating the gain switch up or gain switch down.

Circuit/System Testing

Important: These diagnostics are based on having no trailer connected.

Ignition OFF, disconnect the harness connector at the solid state relay.
Test for less than 5 of resistance between the ground circuit terminal B and ground.

If greater than the specified range, test the ground circuit for an open/high resistance.

Ignition OFF, verify that a test lamp illuminates between the B+ circuit terminal F and ground.

If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the STUD 2 fuse is open, replace the trailer brake control relay.

Ignition ON, verify that a test lamp does not illuminate between control circuit terminal E and ground.

If test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the TBCM.

Ignition ON, verify that a test lamp does not illuminate between control circuit terminal E and B+.

If test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the TBCM.

Ignition ON, test for 3.2-4.1 V between the control circuit terminal C and ground.

If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the TBCM.
If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the TBCM.

Ignition ON, test for 3.2-4.1 V between the control circuit terminal A and ground.

If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the TBCM.
If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the TBCM.

Ignition ON, test for less than 1 V between the control circuit terminal D and ground.

If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the TBCM.

If all circuits test normal, replace the trailer brake solid state relay.
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Ron Nielson

2008 2500HD LT CCLB/Ally. Line-X, B&W Companion, MaxLoader Springs, Edge Insight CTS, Kennedy Custom ECM
2009 Arctic Fox 5er, Silver Fox Edition 29-5T, 3.6 Onan LPG, SteadyFast Stabilizers
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