All. Battery! Current draw procedure introduced in VAS 5051A1B scan tool with the release of software version

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Gillian Simpson
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1 Model(s) Year Eng. Code Trans. Code VIN Range From VIN Range To 00 - Condition October 2, , 07 due to clarification Supersedes Group 27 number 07- dated September 18, Battery, Discharged, Diagnosis for Excessive Static Current Draw Technical Background One or more of the following symptoms is possible. Discharged battery Engine does not start because of low battery voltage Voltage display in the combination instrument displays too low "Low battery" fault codes in various control modules. Production Solution Battery! Current draw procedure introduced in VAS 01A1B scan tool with the release of software version Service I ihip: Refer to ElsaWeb for other s that apply to specific vehicles with discharged batteries. These s provide information about intermittent faults and correct battery testing!charging procedures. (-" Jj Note: Perform ALL STEPS, to systematically test for faults and to avoid repeat repairs. /11"'\ \.!) Note: The power supply to vehicle must not be cut off. DO NOT perform terminal reset. DO NOT remove or disconnect battery, battery cables or fuses. Page 1 of 4 plus attachment C 07 Volkswagen of America, Inc. rights. rv.d. Information contained In thl. document 1. bal.d on the late Information avallabl. at the time of printing and I. lubled to the copyright and oth.r Int.llectual property Figh of Volkswagen of Am.rica, Inc., lh affiliated companl and it. lieenlon. rights are rel.rved '0 make chang at any tim. without notlc. No port of thl. document may b. reproduced, dored In a retrieval syd.~ or transmitted 1" any form or by any mean., electronic, mechanical, photocopying, recording, or otherwl.e, nor may the mat.rial. b. modifi.d or r.po ed to other.h, without the prior.xp. d written p.rml ion of the pubu.h.r.

Check the fault memory. Compare control units on the fault memory print-out with vehicle equipment (PR numbers). Are all necessary control units listed on the print-out?

2 Check the fault memory. Compare control units on the fault memory print-out with vehicle equipment (PR numbers). Are all necessary control units listed on the print-out? Any control units not listed may be faulty and could be indications for the further fault finding. Check which non-genuine parts are installed, e.g. tow bar, animal protection, radio, DVD, etc. If an increased closed-circuit current is found, check these components first. Step 1: Verify Battery Condition 1. Connect Midtronics INC-940 to battery 2. Check and/or charge battery based on applicable 3. If INC-940 test fails battery, replace battery before continuing Step 2: Verify Sleep State Current 1. Connect 0 amp current clamp to VAS 01 AlB 2. Calibrate the current clamp 3. Connect current clamp to negative battery cable with arrow pointing away from battery. Current flows out of the battery to the chassis of the vehicle 4. Close all doors, trunk, or hood latch so vehicle control units detect all doors closed. Arm vehicle anti-theft system with remote I i hip: If vehicle has easy entry handles then it is necessary to keep clear of all handles to avoid bus communication/wakeup message. On vehicles equipped with air suspension, after engine is turned off. the system will stay in standby for up to five minutes 6. Observe sleep state current draw after vehicle is left untouched for TWO HOURS. Vehicle: Phaeton other models Nominal sleep current: 0mA 40 ma Page 2 of 4 plus attachment Cl 07 Volkswagen of America, Inc. rights re rv.d. Information contained In thl. document 11 based on the lat.st Information available at the tim. of printing and I. subied to the copyright and oth.r Int.lI.dual property rights of Volkswagen of America, Inc., it. affiliated componl and h. Iiunlorl. rights are relerv.d.o male. chang of any tim. without notic. No part of thl. document may b. r.produced, stor.d in a retrieval svlt.m, or tran.mi"ed in any form or by any meana,.iectronic, mechanical, photocopying, recording, or otherwi, nor may th mat.rial. b. modifi.d or tepo.ted to oth.r.it, without the prior.xpr d writt.n p.rmi lon of the publi.h.r.

3 7. If after two hours the vehicle exceeds maximum sleep state current draw, proceed to Step 3: Consuming Circuit Isolation. If vehicle does not exceed maximum sleep state current draw, perform a long term (overnight) measurement test. Record the long term measurement using MINIMAX setting of scan tool. Excessive current = Measured current> nominal sleep current Periodic spikes in current draw are normal Step 3: Consuming Circuit Isolation Due to the state of the CAN Bus communications in the vehicle, it is no longer acceptable to pull each individual fuse one at a time to try and identify which circuit is consuming current. Removal! reinsertion of a fuse while vehicle is in a sleep state may wake the bus of the vehicle. and invalidate the test. Identifying "consuming" circuits must be done by measuring a voltage drop across fuse and aligning with the value in matrix located at end of this document. Starting at interior fuse boxes, perform the following tasks: Use VAS 01A1B multimeter function. Fluke 83 multimeter, or equivalent. Use "mv" scale on meter Measure voltage drop across fuse by placing the positive lead on one side of the fuse and negative lead on other side. Take absolute value of reading of voltage drop (ignore negative signs) and then reference voltage drop chart to determine how much current the circuit is currently consuming. See Identifying Current Consumption with Matrix attachment. Check all fuses until fuse with approximate excessive current draw is identified IT/TiP: Excessive current = Measured current> nominal sleep current Page 3 of 4 plus attachment C 07 Volkswagen of America, Inc. rights r rv.d. Information contained In,hi. document I. bal.d on the latett Information available at the tim. of printing and I. lubled 1o the copyright and oth.r Inl.lI.dual property ri"hh of Volluwagen of America, Inc., Its ahiliat.d companl and Itllle.nlon. right. are re Ned to make chang at any tim. without "otic. No pari of.hi. document may b. reproduced, dored In a re'rievol system, or tran.mitted In any form or by any meana, electronic, nmchanical, photocopying, recording, or otherwi, nor may th mat.rlal. b. modifi.d or reposted to other.it, without the prior.xpre eci written perml lon of the publl.h.r.

4 Identification of component: 1. Once fused circuit is identified, use service repair and wiring diagram information in ElsaWeb to identify all components on circuit 2. Disconnect components from the circuit one by one and allow sleep current to stabilize after each elimination. 3. Measure vehicle current consumption and voltage drop across fuse once again. If within normal range, as specified in the table (see Current Consumption Matrix attachment), the component with excessive consumption is identified. 4. Repeat steps above until component is identified causing excessive current draw. Warranty Information only. Required Parts and Tools No Special Parts required. No Special Tools required. Additional Information part and service references provided in this are subject to change and/or removal. Always check with your Parts Dept. and Repair Manuals for the latest information. Page 4 of 4 plus attachment C 07 Volkswagen of America, Inc. tights rel.rv.d. Information contained In,hi. document I. bal.d on the latest Information avallabl. at the tim. of printing and I ubled to the copyright and oth.r Int.lI.ctual property right. of Volkswagen of Am.rica, Inc., h. ahiliated compani and It. IIcenlors. rights are rel.rved make chang at any tim. without notlc. No port of this document may b. reproduced, stored In a retrieval ~.m, or transmitted In any form or by any mean" electronic, mechanical, photocopying. recording. or otherwi, nor may,h mat.rlal. b. modifi.d or repotled to o.h.r.1, without the prior.xpr d wrltt.n p.nnl lon of the publl.h.r.

5 Identifying Current Consumption with Matrix What is needed: o Measured voltage drop across fuse in illv o Fuse type o Fuse rating Measuremen Minr ~tandard mv 7. '-./ ~O.V ) zo r Measured voltage drop across fuse Example: Measured voltage drop =.3 mv Fuse type = Fuse rating = A ~ Fuse type ~ Fuse rating ~ ma Current consumption through circuit = lila Page 1 of3

Current Consumption Measurement mv 0.1 0.2 0.3 0.4 0. 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1. 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2. 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3. 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 4.

6 Current Consumption Measurement mv Matrix Page 2 of3

7 Measurement mv.1.2,3,4,,6,7,8, Page 3 of

Model(s) Year Eng. Code Trans. Code VIN Range From VIN Range To. All All All

Model(s) Year Eng. Code Trans. Code VIN Range From VIN Range To Touareg 2004 3.2L (BAA) All All All Condition 01 08 11 March 6, 2008 2015134 Supersedes Technical Bulletin Group 01 number 07-52 dated June