ESC/ABS & Parking Brake Electrical Faults 03265 and 00493

[Midshift]

Hoping I can make some headway here on some annoyance issues I'd have with my SQ5 since purchase. Have tried to chase these down for the better part of a month, to no avail. Have looked as much as possible online for any assistance and unfortunately there is nothing that has directly helped me with these faults.

For starters, the when turning on the car it immediately throws dashboard errors for the parking brake and ESC modules. When looking further I have uncovered the following codes:

Brake:
Fault 03265, Suspension Sensors Data Bus (No Signal/Communication)
Fault 00493, ESP-Sensor Unit (No signal/Communication)

Parking Brake:
Fault U111300, Internal Fault 185
Fault U111300, Internal Fault 138

I've looked online at the TSB for the wiring harness from the engine bay module through the fender/wing and into the cabin near the driver's A-pillar. No fraying or damage to report. Checked both at the module, throughout the fender, and into the body behind the washer fluid tank. Have purchased two spare G419 sensors to try and swap. Verified that there is a good ground and voltage for the ESP sensor from the harness. None of the sensors (original, coded/swapped) are showing any consistent readings in both live readings 005 and 010 in OBD 11. Showing 0 for G200 and G202 (005), and a static .97 for G201 (010).

For the Parking Brake, I am showing an inclination of 137 in Live Data. This is static and does not change. My assumption is that both Parking Brake faults are a result of the Brake module faults. I've looked through a majority of the readiness readings for the Parking Brake module and everything seems good.

I was searching through long coding and noticed that my dashboard is coded for air suspension. However, being a B8, these cars did not come with air suspension from the factory. I tried to revert to "inactive" when long coding, however, a code is thrown inside the Dashboard OBD11 module stating that is incorrectly coded when disabling air suspension. No, I did not adjust this myself, and no, it does not affect the any readings from the YAW rate sensor.

My thought process is as follows: If I can consistently get a CAN reading for the G200/202 for rotation, I can then use Basic Settings 069 to adapt whichever YAW rate sensor I please to the car. However, I cannot seem to get any sort of reading from any of the three sensors. I'm certainly at a loss here and would rather put the work in to resolve than drop it off at the dealer ship and get taken for a ride financially.

So where do I go from here? My assumption is that there should be a CAN reading coming from the G419 sensor, but that there may be a wiring issue, fuse, or something that is disrupting it from being read into the CAN system and to/through the live data for the network. If there is a reading from the ESP sensor and that feeds into the Suspension Sensors Data Bus, but is not being read correct, this would make sense. However, I cannot determine where to look physically in reference to the Suspension Sensors Data Bus.

Thanks everyone in advance for your help.

[Midshift]

Quick update:

Interestingly enough... went fiddling around with some other basic settings to see what else may be available (shame on me for OBD11 and not VAGCOM, I know). Ended up in Brake Module Basic Setting 03, which activated code 01486 (System Function Test Activated) by default. In order to clear code 01486, you must perform and complete a System Function Test (as one could imagine). Well, one test later and the car was reading info from the G419... ironic.

Drove the car for about an hour and a half (we have the Dream Cruise here this weekend on Woodward Avenue) and all was good. Hopped in the car to leave and immediately received faults 03265 and two for 00493 (for no communication and incorrect adaptation). For some odd reason, I cannot get the G419 to adapt in Basic Settings 069. #2 reads ok, but I receive the "Marginal Conditions Not Met" fault from OBD11 when trying to write. Anyways, cleared the codes and the car appeared fine with no issues.

Got back in the car this morning... immediate codes. Almost like nothing took. Swapped sensors, no luck. Swapped the one that was working last night back in -- won't read consistently or at all anymore. Tried Basic Setting 03, won't take. Dealerships are booked out until end of October for diagnosis. Indy shops are a similar story.

[Midshift]

Seem to be self updating this, however, I have some good news.

Spent the majority of the weekend at the Dream Cruise. Saturday morning during the drive I had codes/no readings. In the afternoon I had some people in the car (we went to do a loop for the cruise). Sensor started reading. Doubt it had anything to do with the extra weight, but probably more so with key cycles. Anyways, ESP/G419 sensor seemed relatively happy for most of the day given the heat, idling, and driving. Only had one key cycle where it prompted the codes while sitting idle in the rain. Anyways, I wonder if it's possible the 01486 (System Function Test Activated) recalibrated the readiness of the G419.

Fingers crossed the issue has resolved itself, and hopefully anyone else that runs into this (and does not have immediate access to VAGCOM) may have this thread to troubleshoot from.

[Midshift]

... and now we update to mixed news.

After the weekend the car started throwing the ESP/Parking Brake lights again. Go figure. Took some time today after work just to double check continuity and voltage again with a voltmeter:

Ground checked out good, worked as ground for the following:
12v hot (~11.7v)
CAN High (~3v)
CAN Low (~3v)

Checked for any shortages on the actual bulkhead. In doing so, found no shortages. Verified resistance for all four wires, as well as continuity for each from sensor plug to bulkhead. Verified the same resistances for both new sensors (of which both worked as some point in time for a short while). At this point, really scratching my head and thinking it has to be a module issue that must be resolved at the dealership.

Any advice from gurus here of other things to check? I know that I could create a second harness specific for this sensor, however, I think it would do more damage than good pinning/depinning the bulkhead and whatnot.

[Midshift]

Dropped the car off this afternoon at VAST Performance in Ferndale, MI. I'm sure our local guys are familiar. Hoping Zach & team are able to get this figured out with ODIS.

[Fast4esT]

how old is your battery? old/weak battery could be causing electrical issues.

[Midshift]

how old is your battery? old/weak battery could be causing electrical issues.

Battery was replaced before my ownership in 2021. Voltage checked out in my tests and was also approved by the shop. I would like to think that if the battery was the root cause, there would be much more wrong than just this.

[Fast4esT]

was a hopeful shot in the dark

[Midshift]

Tossing a final update here for the time being:

Shop found some resistance along the ground for the twisted pair (ground/12v) running from the J104 to the YAW Rate Sensor. Performed a temporary overlay and it cleared everything up at the end of that day. I approved the work order for a permanent ground from the A-pillar post to the YAW Rate Sensor under the assumption this would correct the issue. Received a call the next morning that the $530 diagnosis and ground overlay I approved did not work. Picked the car up that evening as I couldn't conceive having over $1000 into this on another whim that "we think it will work". Received word that ODIS was used and the modules/canbus network checked out okay... but I have no paperwork to confirm. Overall pretty frustrated and felt like I am back to square one with no direction. Provided this post as insight during initial drop off.

Took the car back apart this weekend to look over work performed. Ground looks good (so now it is an external splice) but didn't change anything. I ran a temporary 12v overlay from fuse 12 in the driver's dashboard panel (this is where my airlift already has an "add a fuse", so it was an easy temporary tap). No change or awakening in the sensor during OBD11 checks.

For S&Gs I ran another continuity test for the remaining three wires back to the J104. Both CAN cables checked fine. The 12v checked fine on the correct PIN 32, however, I also found a resistance relationship with PIN 5. I don't have access to Elsaweb and cannot find a pinout anywhere for this online. Hoping someone may be able to assist as I wonder if it may be causing a voltage drop perhaps on readiness checks.

Only other thought process I have is that I did code out my TPMS via OBD11 back when I first picked up the car. However, the issue was intermittent even then (less so, however). I'm curious if the YAW Rate Sensor may not ready up as a result of the TPMS module, if failing? I imagine OBD11 does not nullify that particular module, just masks the codes and/or hides them. Will look into that this week.

[weat4618]

Just a question but you find a cure for this. I’m having the same problems

[Midshift]

Just a question but you find a cure for this. I’m having the same problems

No -- became infuriated after finding the PBM at the back of the car not secured and nearly upside down. Seems like VAST never bothered to look at it. Assuming it probably just needs a computer reset at the dealer, as I do not think OBD11 has that capacity.

Regardless, I took the car down for a trip in October, picked up a B9 allroad in November, and the SQ5 sold a few weeks ago. Issue was still intermittent and I was honest about it when selling.

[weat4618]

Ok, so I fixed the fault. Turns out it was damaged wire in the wiring loom.

Pleased with the outcome

[rogerargueta]

Hey! I feel like the SQ5 owner, tried a lot to fix this, except that I haven't tried wire tests. Can you please share more details on which wires you tested and end to end wire explanation or even a simple diagram with arrows?. On other post, someone mention that removed the LHF (left hand front) wheel to have better access to wires that were corroded and fix them); but others mention wire test from module G419 to ABS module. I'm kind of lost and I need some orientation please!

Ok, so I fixed the fault. Turns out it was damaged wire in the wiring loom.

Pleased with the outcome