Cooper S (R56) L4-1.6L Turbo (N14) (2009)
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K1 ... Kn: control modules on the K-CAN
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M1 ... Mn: control modules on the MOST
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F1 ... Fn: control modules on the F-CAN
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PT1 ... PTn: control modules on the PT-CAN
Check Stability of Most Ring
MOST Bus: Checking Ring Stability
The test module enables a conclusion as to whether the MOST ring is closed or open. It can provide two results:
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The ring is closed at the moment of the check. In this case, the ring is functional (or sporadically interrupted).
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The ring is open at the moment of the check. In this case, the ring is permanently interrupted.
Bus-System Analysis of MOST Ring
MOST System Analysis
Brief description
The test program evaluates certain fault memories from all of the MOST control modules. If there are configuration problems, the target configuration is
stored first.
The evaluation of the existing fault memory entries then provides the most probable fault cause. The results are a maximum of the two most likely fault
causes, for example:
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(* * * *) DVDC DVD changer
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(* *) TEL telephone
Assessment of the result quality:
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(* * * * *) -- > high quality
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(*) -- > low quality
The number of asterisks varies between one and five.
Luminous Power Reduction
MOST Bus: Ring Fault Diagnosis
For the MOST bus, there are intersystem fault memory entries in the control modules. A feature of the system faults is that they can be entered in a
control module although the control module is OK. With the information regarding system faults in all MOST control modules, conclusions can be
drawn about the cause of the fault. The section below covers the system fault "Network wakeup unsuccessful". This fault can be entered in all MOST
control modules.
Fault memory entry: Network wake-up unsuccessful
The fault "Network wake-up unsuccessful" indicates a problem with the optical transmission. Insufficient light or no light is coming through at one
position in the ring. Causes may be:
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Control module without voltage
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Fiber-optic cable defective (e.g. kinked too strongly)
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Transmit diode or receiver diode in a control module defective
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Connector not correctly inserted
A distinction must be made as to whether the MOST ring is permanently or sporadically interrupted. To test, select and run the test module Check
stability of the MOST ring. If the MOST ring is sporadically interrupted, run the test for light output reduction. If the MOST ring is permanently
interrupted, run the ring fault diagnosis.
Test of light output reduction
In the test program, the light output is automatically lowered for one MOST control module after the other. if you want to run the test for light output
reduction for a special control module manually, then:
1. Switch on loud music.
2. Change to "Control-module functions" of the special MOST control module (component activation: MOST bus light output reduction) and this
control module reduce the light output (the light output is lowered for 5 seconds and then automatically reset by the control module to the normal
value).
3. If the optical transmission from control module A to its successor (control module B) is OK, slight noise ("crackling") can occur when the light
output (from control module A) is lowered and automatically raised.
4. If the optical transmission from control module A to control module B is not OK, the music goes off for a few seconds. This means that the defect