[penguinfree]

Hi all, I have lurked around here for years to find valuable info on my first gen CTS-V, but I always found what I needed without having to post a question. Anyway, I just bought a 2007 SRX V6 AWD off a local guy on Craigslist. Nice rust-free body and underbody, relatively low mileage (125k) with a recent engine swap (47k on the engine a year ago). I had it brought home on a flatbed July 2nd, and at this point I have replaced the pads, rotors, and calipers on all 4 corners (Bubba has been here... he broke off all the bleeders for me), the master cylinder, bled everything, then replaced both front wheel bearings (Bubba again... he also hacked off the wheel speed sensor wires for me). At this point I have working brakes and got rid of the service traction control, ABS, and stabilitrak messages.

I still have no data from any of the tire pressure monitors, and no initial horn response in the 'learn' procedure. I set the parking brake, turn the key on, page to the tire pressure re-learn page, hit the check mark, and the message just flashes once. Nothing else. Same thing when I try to have it pair with a keyless entry fob. Just a quick flash, and the 'press check mark to pair' message comes back. I have checked the fuses in the driver side rear, nothing blown. Also probed with a voltmeter, 12.6V getting that far in the circuit.

Does the SRX use the same module to receive TPMS telemetry as it uses to receive RKE signals ? I'm suspecting whatever module is supposed to be handling those functions may have also been on Bubba's hit list, lol.

My apologies if Bubba isn't known for applying his tech skills to Caddies; he seems to have done some service on every 3rd gen Corvette out there, and I've gotten used to seeing his creative work

 

[penguinfree]

Oh, one more thing I'm chasing down. My nav seems to be completly functional except for one thing... the position never changes. The nav still thinks the vehicle is 25 miles SW from me, where I picked the car up from. I do get GPS telemetry from the car with the OBD dongle and Torque app, but haven't looked to see if it moves when I test drive the car. Still in line to hit the Sec State office and get my title and registration done.

 

[bguild]

Is it possible Bubba replaced the TPMS stems with regular ones?

Apparently TPMS signal goes from antenna module to DIM, see below.

TPM Learn Mode Description

The tire pressure monitor (TPM) system uses the driver antenna module, dash integration module (DIM), keyless entry transmitter, 4 radio frequency (RF) transmitting pressure sensors, and the serial data circuit to perform the TPM learn mode functions. The sensor learn procedure must be performed after every driver antenna module replacement, sensor replacement, or tire rotation. Once the learn mode has been enabled, each of the sensor's unique identification (Id) codes can be learned into the driver antenna module's memory. When a sensor's Id has been learned, the driver antenna module sends a serial data message to the DIM to sound a horn chirp. This verifies the sensor has transmitted its Id and the driver antenna module has received and learned it. The driver antenna module must learn the sensor Ids in the proper sequence to determine correct sensor location. The first learned Id is assigned to the left front location, the second to right front, third to right rear and forth to left rear.

Sensor Function Using Pressure Increase/Decrease Method

Each sensor takes a pressure measurement sample once every 20 seconds while in stationary mode. If the tire pressure increases, or decreases by more than 11 kPa (1.6 psi) from the last pressure measurement, another measurement will occur immediately to verify the change in pressure. If a pressure change has indeed occurred, the sensor transmits in re-measure mode. When the driver antenna module receives a re-measure mode transmission while in TPM learn mode, it will assign that sensor's Id to the location on the vehicle relative to the order in which it was learned.

Sensor Function Using J-46079

Each sensor has an internal low frequency (LF) coil. When the J-46079 TPM tool is used in activate mode it produces an LF transmission that activates the sensor. The sensor responds to an LF activation by transmitting in learn mode. When the driver antenna module receives a learn mode transmission while in TPM learn mode, it will assign that sensor's Id to the location on the vehicle relative to the order in which it was learned.

TPM Learn Mode Cancellation

The driver antenna module will cancel the learn mode if more then 2 minutes have passed and no sensors have been learned, or if it has been in learn mode for more than 5 minutes. If the learn mode is canceled before any Ids are learned, the driver antenna module will remember all previously stored Ids and their locations. As soon as the fist sensor Id is learned, all other Ids are erased from the driver antenna module's memory.

Sensor Learn Procedure

Important: Before proceeding with the steps below, ensure that no other sensor learn procedure is being performed simultaneously, or that no tire pressures are being adjusted on another TPM equipped vehicle within close proximity.

Turn ON the ignition, with the engine OFF.
Using the keyless entry transmitter, lock and unlock the vehicles doors 3 times in order to synchronize the transmitter with the driver antenna module.
Important: If the TPM learn mode cannot be enabled, ensure the TPM system is enabled in the DIM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Simultaneously press the keyless entry transmitter's lock and unlock buttons until a horn chirp sounds, or with the scan tool select Sensor Learn Mode Enable and press the ENTER key. A horn chirp will sound indicating the mode has been enabled.
Caution: Over inflating tires may cause personal injury or damage to the tires and wheels. When increasing tire pressure do not exceed the maximum inflation pressure as noted on the tire sidewall.

Starting with the left front tire, hold the antenna of the J-46079 TPM tool against the tire sidewall close to the wheel rim at the valve stem location then press and release the activate button and wait for a horn chirp, or increase/decrease the tire pressure for 5-8 seconds, or until a horn chirp sounds. The horn chirp may occur before the 5-8 second pressure increase/decrease time period has been reached, or up to 30 seconds after the 5-8 second pressure increase/decrease time period has been reached.
After the horn chirp has sounded, proceed as in step 4 for the next 3 sensors in the following order:
5.1 Right front
5.2 Right rear
5.3 Left rear
After the left rear sensor has been learned, a double horn chirps will sound, indicating all 4 sensor Ids have been learned.
Turn OFF the ignition.
Adjust all tire pressures to the recommended kPa/psi. Refer to XXXXX in General Information, or to Tire Inflation Pressure Specifications in Maintenance and Lubrication.

 

[n7don_srx]

As suggest I'd confirm there's actual TPMS installed or the batteries are not at their life's end. Generally TPMS's battery life is less than 12 yrs. I had problems using the procedure in the OM. The procedure did wake-up the system but I could not get it to complete all 4 positions. Ended up going to Discount tire and they reprogrammed.... no charge (since I bought the tires from them)

 

[penguinfree]

Thanks. I forgot to mention that I had the SRX over to my local Belle Tire for a new set of rubber too. The tech over there confirmed there are TPMS sensors in all four tires, and three of the four checked out fine with their rf scanner. Also tested my RKE remotes at Autozone with their little Energizer test box, and confirmed they are transmitting. So my question is regarding the receiver modules in the vehicle.

 

[n7don_srx]

This is a longshot on the nav system.... try removing the radio fuse from the underhood fuse block for a few seconds. Several times in the life of my '07 the screen has been blank, especially after a battery disconnect. I think this reboots the system. Also might try removing and reinserting the nav. dvd. I've even gently blew some compressed canned air (for computer keyboards) into the opening to dislodge any dust build-up.

 

[n7don_srx]

Did the Belle Tire tech actually do a relearn procedure? or just confirm 3 of 4 sensors were working. Also any idea if original sensors?

 

[penguinfree]

They only checked the tpm sensors themselves. The car itself isn't reaponding to any commands to go into learn mode. I'm not sure about the age of the batteries in the sensors; but if nothing else the sensors on my CTSV should have been in range when I attempted to put the SRX into learn mode at home.

 

[penguinfree]

I have some hardware coming today that should give me most of the functionality of a tech2, hopefully some diagnostics will shed some light on the issue. From what I've found so far, it sounds like either an antenna module or RCDLR issue. There was a tech bulletin about reflashing the RCDLR and replacing key fobs due to the same symptoms. I will update if I find anything else.

 

[penguinfree]

Okay, so now I have tech2win working, and am able to access a ton of info from the vehicle systems ... except for the RCDLR (remote door lock receiver) module ... which also handles the TPMS signals. For that module I get 'no comm'. I'm guessing Bubba has been back there

 

[penguinfree]

Update - I located the problem. I'll post what I found here, just in case someone in the future is fruitlessly google searching for information.

First, the RCDLR (remote keyless door lock receiver) is located under the little storage tray in the passenger side rear, the flippy cover in the 3rd row seat area. You DO NOT have to remove the entire rear right interior panel to get to it. Just lift the rubber bottom out of the storage compartment, find the two or three screws that hold it in place, and carefully pull the compartment out. The RCDLR is clipped directly to the underside of that compartment.

What I found when I pulled my RCDLR out was the +12V pin in the plug was corroded completely off from the module. It is supposed to have 4 pins in the plug, three of which are used - red/white +12V, Black/white GND, and a green signal wire. I pulled my module out, turned the ignition to ON (probably not necessary), and confirmed I have 12V between the red/wht and blk/wht wires at the plug. Okay, so the wire harness is probably okay.

Next, I opened up the RCDLR module itself, pulled the pc board out of it, and sure enough I found one of the 4 pins broken off. That was supposed to be supplying 12v to the board. Also found some pretty significant corrosion all around the board. I cleaned it off as best I could, wire wheeled the broken contact pad, and soldered a piece of a small paperclip to take the place of the broken pin. OK now the pc board is going to see 12V.

I plugged the board back into the vehicle wire harness, checked on the back of the pins where they're soldered to the board, and confirmed 12v between the pins for red/wht and blk/wht. So my plug repair is working. Finally I turned the key on and scrolled through to the 'learn remote' section, and .... drum roll .... no change. Still no 'remote learning active' message. I plugged the tech2 into the vehicle and attempted to read information from the RCDLR module also, and still got 'no comm'.

So the problem is definitely my corrosion addled RCDLR module. Not the remotes, not the TPMS sensors, not a fuse, not the wiring harness, not programming. It's definitively this little 2 x 3 inch pc board. IDK whether I'm going to dive into figuring out how to flash a new module with the tech2 through tis2web or not. I may just live without the lack of keyless entry and the service TPMS message on the dash.

Just thought since I started the discussion I would close the loop.

 

[bguild]

Go grab one at a junkyard, prolly $10 cause they will have no clue what it is.

 

[penguinfree]

I did break down and order one off ebay for 25 shipped. It came out of another 2007 srx and is the same part number, so I figured there's a good chance it will have the same rev firmware on it. I hooked the tech2 setup to my 05 cts-v and read the data from the receiver in that, and it didn't show a vin number... so I'm hoping the 07 srx one doesn't vin lock. If it works, it'll be a cheap fix. If it doesn't, I might try my hand at solder gun microsurgery to swap the eeproms.

 

[Enterprise 4Cam]

"Go grab one at a junkyard, prolly $10 cause they will have no clue what it is."

They did not know a DVD player was part of the SRX console, $15 ! It works!
They didn't care that the shifter/cable/lid/hardware/harness on the Deville/DTS console was in my wheelbarrow. $15 Every piece/part to make the swap complete.

But $25 is a great deal on the receiver, in a box on your doorstep. I sure hope it works out well!
Great info, not your problems of course, the info.
Everyone into these needs every tidbit of discovery/experience.

SRX's are low production by any Detroit standard. It will only get tougher to keep em going. 1st gens.

 

[penguinfree]

To further close the loop here, I received that RCDLR module from the Ebay seller today, and was eager to try it out as soon as I got home from work. I was in error above where I thought it was 2 phillips screws to pull the storage tray; it's 2 7mm hex head screws, and the trim panels adjacent to it have to be popped off as well.

Anyway, I popped out that tray, fished out the wire, plugged in my new module, turned the key on, paged to 'relearn remotes', hit the check mark button, and Bam ! REMOTE LEARNING ACTIVE. Programmed my remotes, and everything works beautifully. No programming needed. BTW I have seen discussions about an antenna associated with the keyless entry module... There is no separate antenna on mine. Just the single 4-pin plug running power, ground, and signal.

Now I just need to get that one dead TPMS sensor replaced, and that will all be working as it should too. Tomorrow I get rid of that last nagging message on the dash