CRuby

Getting code 01203 - Electrical Connection between ABS & Instrumentation Cluster, 31-00 Open or Short to Ground.

Background:
Initially had no communication to abs module. Had broken silver wires in ABS module & had it repaired by Module Masters. Installed, & then had code 01203. Got a 2nd ABS module from MM, thinking 1st was still bad. Same 01203 code with 2nd module.

Found wiring diagrams in Bentley & checked circuits btwn ABS & Cluster as shown in pic.
Circuits test good continuity & no short to ground.
Don't know what to check next, to hunt down this problem.

jakematic

Have you coded the new ABS module ?

A complete Auto-Scan would be helpful too.

CRuby

Thanks for the interest Jakematic.
No I did not recode. #1 rebuilt module was from my car, so did not recode.#2 module was same part number & didn't think I needed to recode it. Vagcom was able to communicate with both 1 & 2, with same fault code occurring after clearing codes.

I'll get a copy of the auto-scan from my other computer at home & post it here.
Car is in service position right now, after replacing clutch & other items, & I'm rebuilding fan motors due to worn brushes. So I may not be able to do a new scan right away, but I think I have an older one, & this problem hasn't changed.

jakematic

Not sure what all is involved in the rebuild, but I still would want to look at it on #1.
For #2 you'll very likely need to recode it.
Note that one of the models has coding for with/without CAN bus.

You *should* be able to use the original coding for #1 on #2 unless it's a variant (aka color coded) part number.

Post up the complete scan when you get a chance and I'll take a look.

CRuby

I don't have a recent autoscan that was saved since ABS was repaired. I will do another once we get engine up & running again. So be aware this scan is quite out of date (Feb 2012). Some updates that I recall are: 1) all misfires & cam position info is fixed, 2) Don't think we had ABS rebuilt at this time (not sure if it was unplugged), 3) O2 sensor fixed, 4) all central lock faults have been fixed.
So I'll understand if you hold back until I get a current scan, so I'm not chasing ghosts. It'll be likely ~2 weeks until I get a current scan, as I'm waiting for other parts, & mostly work it on weekends.

I'm not very VAGCOM savy, but one of the puzzling issues is that near top of scan it lists the following, but only the ones I marked in red are listed in detail below. Is it supposed to be providing scans of each address number listed, or does it skip some for a reason.
Chassis Type: 4B - Audi A6 C5
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
75 76 77

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Chassis Type: 4B - Audi A6 C5
Scan: 01 02 03 06 08 15 16 17 18 22 34 35 36 37 45 55 56 57 65 67
75 76 77

-------------------------------------------------------------------------------
Address 01: Engine Labels: 078-907-551-AZA.lbl
Part No: 4B0 907 551 K
Component: 2.7l V6/5VT G 0003
Coding: 06612
Shop #: WSC 00000
VCID: 2C590500DC10163

12 Faults Found:
18014 - Rough Road/Engine Torque Signal from ABS
P1606 - 35-00 - Electrical Malfunction
17748 - Camshaft Position Sensor (G40) / Engine Speed Sensor (G28)
P1340 - 35-00 - Incor. Correlation
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 -
16685 - Cylinder 1
P0301 - 35-00 - Misfire Detected
16688 - Cylinder 4
P0304 - 35-00 - Misfire Detected
16686 - Cylinder 2
P0302 - 35-00 - Misfire Detected
17965 - Charge Pressure Control
P1557 - 35-00 - Positive Deviation
17927 - Camshaft Adjustment; Bank 1
P1519 - 35-10 - Malfunction - Intermittent
17539 - Oxygen (Lambda) Sensor; B2 S1
P1131 - 35-10 - Internal Resistance too High - Intermittent
16687 - Cylinder 3
P0303 - 35-00 - Misfire Detected
16690 - Cylinder 6
P0306 - 35-00 - Misfire Detected
17755 - Camshaft Position Sensor 2 (G163) / Engine Speed Sensor (G28)
P1347 - 35-00 - Incor. Correl.
Readiness: 0010 0101

-------------------------------------------------------------------------------
Address 08: Auto HVAC Labels: 4B0-820-043-MY1.lbl
Part No: 4B0 820 043 K
Component: A6-Klimavollautomat D64
Coding: 00160
Shop #: WSC 02325
VCID: 2245EB38AED4D03

2 Faults Found:
00779 - Outside Air Temp Sensor (G17)
30-10 - Open or Short to Plus - Intermittent
01582 - Signal for Coolant Temperature
30-10 - Open or Short to Plus - Intermittent

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Address 15: Airbags Labels: 4B0-959-655-AI8.lbl
Part No: 4B0 959 655 F
Component: Airbag Front+Kopf 0002
Coding: 00406
Shop #: WSC 02335
VCID: 336B1E7C012E49B

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 4B0-907-487.lbl
Part No: 4B0 907 487
Component: E Lenkrad Elektronik D03
VCID: E9D73C14936243B

No fault code found.

-------------------------------------------------------------------------------
Address 35: Centr. Locks Labels: 4B0-962-258.lbl
Part No: 4B0 962 258 J
Component: Central Lock/Alarm D32
Coding: 15885
Shop #: WSC 02325
VCID: 30611170F038723

9 Faults Found:
01366 - Opened Due to Crash Signal
35-00 - -
01371 - Alarm triggered by Door Contact Switch; Driver's Side
35-00 - -
01374 - Alarm triggered by Terminal 15
35-00 - -
01370 - Alarm triggered by Interior Monitoring
35-00 - -
01369 - Alarm triggered by Hood Switch
35-00 - -
01368 - Alarm triggered by Luggage Compartment Switch
35-00 - -
00955 - Key 1
09-10 - Adaptation Limit Surpassed - Intermittent
00956 - Key 2
09-10 - Adaptation Limit Surpassed - Intermittent
01574 - Alarm triggered by Door Contact Switch; Right Rear
35-00 - -

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr Labels: None
Part No: 4B0 959 760 A
Component: Sitzmemory D05
VCID: 2B5B061CD91E11B

1 Fault Found:
01447 - Sensor for Driver Seat; Height Adjust (G231)
36-00 - Open Circuit

-------------------------------------------------------------------------------
Address 45: Inter. Monitor Labels: None
Part No: 4B0 951 178 A
Component: Innenraumueberw. D02
Coding: 00101
Shop #: WSC 02325
VCID: 264DF728C2FC2C3

1 Fault Found:
01349 - Alarm via Theft Warning System; Front
35-00 - -

-------------------------------------------------------------------------------
Address 56: Radio Labels: 8D0-035-1xx-56.lbl
Part No: 4B0 035 195 A
Component: Radio D00
Coding: 00205
Shop #: WSC 02325
VCID: 1E3DDFC89AACF43

No fault code found.

End ---------------------------------------------------------------------

jakematic

No, it should not skip modules.
It thinks those are installed for some reason and may just be trying every plausible address for that chassis since it cannot reach the cluster.

What's odd is 03 and 17 are missing - the two I was most interested in.

Has anything else been replaced (e.g. cluster, ECU, etc) ?
Not having the original coding for 03 could be tricky but it should be able to be reverse engineered.
The cluster is what controls comms to all the module so suspect wiring can't be ruled out yet.

A more recent scan would be more helpful, when you have the time

obd2works

thank you for your sharing