B1316, B1321 , B1326
Symptom: Soft top malfunctioning.SID message “TOP CYCLE ERROR” may be displayed, depending on which DTC was generated.
Potentiometer ( B1316 - Fifth bow, B1321 - Tonneau, B1326 - Main motor) reading unstable
Fault symptoms
Soft top malfunctioning.
SID message “TOP CYCLE ERROR” may be displayed, depending on which DTC was generated.
Conditions
The potentiometer is giving unstable values to the control module.
Diagnostic help
The potentiometer value can be read with the diagnostic tool.
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Connect the diagnostic tool.
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Turn the ignition switch to the ON position.
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Read the value for the potentiometer.
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If everything is functioning correctly, the diagnostic tool should display the potentiometer value, which should lie between 15 and 240 depending on the position of the soft top. Check the potentiometer value by activating the relevant motor with the ROOF button or diagnostic tool. Alternatively, disengage the motor with the emergency closing lever. The potentiometer value should change smoothly without fluctuating up and down.
It is important to check the mechanical function of the potentiometer and that it is correctly fitted. The potentiometer guide must not be damaged.
Checking the wiring
Intermittent faults can occur during temporary short circuits and open circuits. Jiggle the wiring harness in several places and in various directions to detect problems in the wiring harness and connectors. Watch the multimeter, diagnostic tool and test lamp during the check.
Diagnostic procedure
1. Check the mechanical function of the potentiometer
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Make sure the potentiometer is fitted correctly.
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Check for damage on the potentiometer guide.
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Is the function correct?
Change the potentiometer. Continue with step 2.
Rectify the fault and continue with step 2.
2. Final check
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Clear the diagnostic trouble codes.
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Activate the soft top with the ROOF button and operate it for a few cycles
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Make sure the soft top is functioning correctly and that no diagnostic trouble codes are generated.
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Has the diagnostic trouble code recurred?
Change the control module as described in
The fault has been rectified.
