{"type":"doc","content":[{"type":"paragraph","content":[{"text":"Abstract","type":"text","marks":[{"type":"strong"}]},{"text":": TXD bus waveform analysis and diagnosing","type":"text"}]},{"type":"rule"},{"type":"paragraph","content":[{"text":"Applies to: BMW X Series 2000-2006(E53)","type":"text","marks":[{"type":"em"}]}]},{"type":"rule"},{"type":"bodiedExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"section","parameters":{"macroParams":{},"macroMetadata":{"schemaVersion":{"value":"1"},"title":"Section"}}},"content":[{"type":"extension","attrs":{"extensionType":"com.atlassian.confluence.migration","extensionKey":"legacy-content","text":"","parameters":{"cxhtml":"65%

TXD bus IPO diagram

\n\n

The following diagram shows components on TXD bus. Note DSC, KOM
\n

\n\n

TXD Bus

TXD bus is a single wire communication protocol used to communicate between vehicle modules and scan tools.
\nIt operates from 0 vdc to 12 vdc.

\n\n

TXD Bus Voltage Waveforms

\n\n

Use the following waveforms to aid diagnosis of TXD bus
\nWaveforms were captured using a 16 pin OBD II breakout box connected to the DLC. A BMW GT1 scan tool was used during waveform capture.
\nLapscope was connected to PIN 8 TXD bus

\n\n

Click on thumbnail for larger image.

\n\n

Ignition key OFF, no scan tool plugged into DLC

\n\n

Ignition key OFF, with scan tool plugged into DLC

\n\n

Ignition key ON, no scan tool plugged in

\n\n

Ignition key ON, with scan tool plugged in

\n\n

Ignition key ON, Scan tool performing Short Test

\n\n

Ignition key ON, Scan tool communicating with KOM (instrument cluster)

\n\n

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\n\nBefore Performing any Work

Please read Cautions and Warnings before proceeding with any work on your vehicle

\n\n#fff#dddRelated Technical Manuals#999

\n\n\n\n\n\n

BMW X5 (E53) Service Manual: 2000-2006
\n
\n

\n\n\n\n

More BMW products...

\n\n#fff#dddTechnical Discussion Forums#999

\n\n5truefalse\n

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TXD - Bus (diagnosis bus) System Operation - Voltage Waveforms