B1467
Symptom: “TOP CYCLE ERROR” displayed on the SID. The soft top cannot be operated correctly. The main motors are not functioning.
Main Motors. Short Circuit / Short to Ground / Stall Current
Fault symptoms
“TOP CYCLE ERROR” displayed on the SID. The soft top cannot be operated correctly. The main motors are not functioning.
Conditions
Open circuit or short to ground on pin 1 (K20) or pin 11 (K20).
Diagnostic help
The main motors can be activated and their 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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Read the status of the motors or activate it.
The status of the motors can be:
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Make sure the soft top is moving freely by activating the motor with the ROOF button or diagnostic tool. Alternatively, disengage the motors with the emergency closing lever and pull the soft top up and down by hand.
The direction of rotation of the main motors is changed by reversing the polarity.
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The soft top is raised when pin 1 (K20) is +.
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The soft top is lowered when pin 11 (K20) is +.
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The power supply to the motors passes the emergency closing lever switch.
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 motors
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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 a test lamp and activate as follows:
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For the right-hand motor (574RH):
between pin 1 and ground, activate DOWN
between pin 2 and ground, activate UP
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For the left-hand motor (574LH):
between pin 1 and ground, activate UP
between pin 2 and ground, activate DOWN
The test lamp should light up.
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Does the test lamp light up?
Continue with step 2.
Check and if necessary rectify the relevant lead. Note that the emergency closing lever switch is included in the circuit. Continue with step 4.
2. Check the mechanical function of the soft top
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Disengage the soft top by activating the emergency closing lever.
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Operate the soft top by hand. Make sure it runs smoothly without getting jammed.
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Is the soft top running freely?
Continue with step 3.
Rectify the fault. Continue with step 3.
3. Localize the faulty motor
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Connect the diagnostic tool.
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Reset the emergency closing function.
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Turn the ignition switch to the ON position.
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Activate the motor with the diagnostic tool.
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If the function is correct, the soft top should move.
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Is the function correct?
Repeat the procedure with both motors connected. If the soft top works when both motors are connected, check and if necessary rectify the motors, emergency closing lever switch and lead. Continue with step 4.
Change the motor and continue with step 4.
4. 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.
