B1447
Symptom: The soft top cover cannot be operated
Tonneau Motor. Short circuit / Short to Ground / Stall Current
Fault symptoms
The soft top cover cannot be operated
Conditions
Open circuit or short to ground on pin 16 (K20) or pin 17 (K20).
Warning
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The normal control module safety functions are disconnected when the soft top mechanism is operated with the diagnostic tool. The motors continue to run as long as the diagnostic tool activates them, irrespective of the position of the soft top, fifth bow or soft top cover. Use caution and always lower the rear seat backrest.
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Diagnostic help
The soft top cover motor can be activated and its status 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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Activate the motor or read its status.
The status of the motor can be:
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Make sure the soft top cover is moving freely by activating the motor with the ROOF button or diagnostic tool. Alternatively, disengage the motor with the emergency closing lever and pull the soft top cover up and down by hand.
The direction of rotation of the motor is changed by reversing the polarity.
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The soft top cover is raised when pin 17 (K20) is +.
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The soft top cover is lowered when pin 16 (K20) is +.
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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 power supply to the motor
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Connect the diagnostic tool.
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Turn the ignition switch to the ON position.
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Connect the test lamp and activate as follows:
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between pin 1 and ground, activate DOWN
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between pin 2 and ground, activate UP
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The test lamp should light up.
Does the test lamp light up?
Continue with step 2.
Check and, if necessary, rectify the relevant lead. Continue with step 3.
2. Check the mechanical function of the soft top cover
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Disengage the soft top cover motor by activating the emergency closing lever.
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Operate the soft top cover by hand. Make sure it runs smoothly without sticking.
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Is the soft top cover running freely?
Change the motor. Continue with step 3.
Rectify the fault. Continue with step 3.
3. 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.
