B2455
Read the instructions below then
start the fault diagnostic procedure.
Symptom: The LED on the control button unit shows a red light (when the fault is active).
Ringing up is possible, you cannot be heard but you can hear the caller.
Microphone Circuit Malfunction
Fault symptoms
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The LED on the control button unit shows a red light (when the fault is active).
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Ringing up is possible, you cannot be heard but you can hear the caller.
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On-Board Diagnosis
Type of diagnosis:
Enabling criteria:
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The battery voltage must be 9.5 - 15.5 V
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The above conditions are fulfilled for more than 10 s.
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Fault criteria:
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The signal input of the microphone is short circuited to B+ or there is a break in the reference ground of the microphone circuit for more than 1 s.
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Checking the wiring harness
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Check switches, connectors and crimp connections for oxidation, withdrawn pins and pin clamping force.
Diagnostic help
The present fault code is erased directly the fault ceases. The historical fault codes are erased after 50 fault free driving cycles.
Diagnostics applies to
Electrical fault in the connecting leads or in the microphone.
