Reading Measured Value Block ( Climatronic Control Module J255)

Reading Measured Value Block

NOTE:
- The lists of various measured value blocks is for information purposes only. When implementing "Reading measured value block" function as part of Guided Fault-Finding, an explanation is given of appropriate measured values in addition to notes on function of various components "Guided Fault-Finding" function of Diagnostic Operation System VAS 5051. For installing locations of components actuated. Depending on position of control motor, various flaps are closed or opened over control motor adjustment range by way of attached cam plate "Guided Fault-Finding" function of Diagnostic Operation System VAS 5051.

- If a value of greater than "250" (open circuit or poor ground connection) or less than "5" (open circuit, fault in 5V supply voltage or short to ground) is displayed for one (or several) potentiometer(s) in one (or more) control motor(s), this is an indication of a fault in wiring to control motor or in potentiometer of the or a control motor (same positive supply or ground connection).
- If value displayed for a control motor is outside permitted range, check assignment of levers and cam plates connecting shaft of control motor to flap or flaps.
- If a permissible value cannot be determined for a potentiometer in a control motor during "Basic setting" function, a substitute value is indicated in display group for this control motor and a DTC stored in DTC memory. This substitute value (approx. mid-position in permissible tolerance range) is used by Climatronic Control Module J255 (or Rear A/C Control Head (Climatronic) E265) to control flap position in emergency operation.
- Depending on version (of Climatronic Control Module J255 and Rear A/C Control Head (Climatronic) E265), measured value block reading may be "On" or "1" and "Off" or "0".

Reading Measured Value Block (Climatronic Control Module J255)

- With ignition off, connect Diagnostic Operation System VAS 5051A with Diagnostic Cable - 3 meter VAS 5051/5A to 16- pin diagnostic socket in vehicle.
- Switch on ignition or start engine.
- Set "Auto" mode on Climatronic Control Module J255.
- Use address word "08" to select air conditioner/heater electronics.







Indicated on display of Diagnostic Operation System VAS 5051A:
- Check DTC memory Check DTC Memory (Function 02)
- Select function "08 - Reading measured value block".







Indicated on display of Diagnostic Operation System VAS 5051A:
- Prompt for entering display group appears in display zone - 1 - .
- Input keypad appears in display zone - 2 - .
- Use input keypad in display zone - 2 - to enter desired display group (e.g. "001" or "01" for display group number "001") and confirm by touching Q key.
List of available display group numbers:
- Display groups "001" to "019" Evaluating Measured Value Blocks - I
- Display groups "020" to "039" Evaluating Measured Value Blocks - I
- Display groups "040" to "050" Evaluating Measured Value Blocks - I







Indicated on display of Diagnostic Operation System VAS 5051A:
- Display group selected appears in zone - 1 - .
- Values for four display zones appear in zone - 2 - :
- Value for display zone "1" appears on first line.
- Values for respective display zones appear on second, third and fourth lines.
- Line remains blank if a display zone is not used.
- Touching keys - 3 - permits switching to a different display group.
- Touching keys - 4 - permits switching to a different function (e.g. from "Reading measured value block" to "Basic setting" and back again).
- Enter desired display group number.