Cooper S (R53) L4-1.6L SC (W11) (2004)
Instrument Panel Control Module: All Technical Service Bulletins
Instruments - Speedometer Needle Vibrates
Service Measure Instruments
M62 200 04
March 11, 2004
Subject
R50, R53; speedometer needle vibrates
Complaint
Speedometer vibrates for five seconds when the engine is started.
The fault occurs intermittently.
Vehicles concerned: R50 and R53
Cause
1.
Calibration process (design issue)
2.
Software problem
Measure
Cause 1:
To avoid there being an imprecise zero position, there are two possible calibration processes for the speedometer needle:
a)
Brief recalibration
All needles (including speedometer needle) drop once to the lower stop.
This takes place automatically when the ignition is switched back on after the K-bus has been in sleep mode.
b)
Long recalibration
Speedometer needle vibrates or fluctuates for approximately 5 to 10 seconds. This takes place under following conditions:
-
If the power supply to the instrument cluster has been disconnected.
-
After a battery disconnection
-
After a fuse for the instrument cluster has been replaced
-
Blown instrument cluster fuse (it is assumed that the speedometer functions correctly when the ignition is switched on despite the blown fuse)
-
Temporary drop in the instrument cluster voltage to less than 8.5 Volt Both of these processes are normal for the instrument cluster.
Cause 2:
If the fault cannot be explained by the calibration process described above, do not replace any parts.
This Service Measure will be updated as soon as additional information is available.