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11.5 Cabriolet Soft Top (CST), Roll Bar (RB) (Manual Operation) > 12 Diagnosis - Diagnostic Trouble Code (DTC) Memory

Diagnosis - Diagnostic Trouble Code (DTC) Memory

WARNING: Risk of Personal Injury!

MOVING COMPONENTS

When working on components which are moved by hand, by electric motor, by hydraulic or pneumatic means via a connecting mechanism, severe injury may be sustained as a result of severing, trapping or crushing of limbs.

During work in the area of the roll bar, there is a risk of serious injury should the roll bar suddenly deploy.
Extend the roll bar before working in the rollbar area. Keep parts of your body away from the range of travel of roll bar mechanism.

Refer to Hydraulic Test Program, 33/4; for additional important safety warnings and precautions.

Prerequisite for reading DTC memory

1. Fuses OK.
2. Battery voltage > 11 V.
3. Connect HHT according to connection diagram, see section 0.

Note:
The DTC's, actuations and actual values can be found under HHT menu for roll bar/soft top control module.
The electronic ignition-starter switch (N73) serves as an interface (gateway) between the roll bar (RB) control module (power soft top) (N52) and the Hand-Held Tester (HHT).

Note regarding DTCs

Current diagnostic trouble codes are high lighted in black on the display.
Additional detailed fault information based on fault type is displayed with nearly all diagnostic codes (DTC's) such as:

> resistance too great
< resistance too low
+ short circuit to positive (POS)
- short circuit to ground (GND)
-//- open circuit

Preliminary work:
Diagnosis - Function Test 11

DTC
Possible cause Note Test step/Remedy 1)

Fault in roll bar (RB) control module (power soft top) (N52)
23 1

Voltage, terminal 30 is less than 10 V
Voltage is checked via the CAN data bus Read out actual value

Left rear power window switch (N72s3) operated for more than 25 seconds The switch N72s3 is read in by the lower control field control module (N72) Diagnostic Manual Body and Accessories Volume 2.1,
Section 5.4, 23

Right rear power window switch (N72s4) operated for more than 25 seconds The switch N72s4 is read in by the lower control field control module (N72) Diagnostic Manual Body and Accessories Volume 2.1,
Section 5.4, 23

Temperature of hydraulic unit motor (A7/5m1) is higher than 85°C
23 7

Temperature of hydraulic unit motor (A7/5m1) is higher than 120°C
23 7

Substantial temperature rise of hydraulic unit motor (A7/5m1). The fault code is set:

Temperature at A7/5 Increase in temperature

40 °C to 50 °C > 4 °C per sec.
or
50 °C to 90°C > 2 °C per sec.
23 7

Resistance of temperature sensor of roll bar (RB) hydraulic unit (power soft top) (A7/5) implausible (>180°C), short-circuit to ground.
The fault code is set if the temperature of the hydraulic unit motor (A7/5m1) is higher than 180 °C. 23 7

Resistance of temperature sensor of roll bar (RB) hydraulic unit (power soft top) (A7/5) implausible, wire open-circuit. The fault code is set if the temperature of the hydraulic unit motor (A7/5m1) remains lower than 15°C also after operating the power soft top switch (S84) for 8 seconds.
23 7v

Power soft top switch (S84) operated for more than 250 seconds. 23 3

RB switch (manual operation) (S83) operated for more than 25 seconds. 23 20

Current in roll bar (RB) valve block rod side valve (Y57y10) too high or too low.
The fault is recognized by the evaluation of a test current pulse from roll bar (RB) control module (power soft top) (N52).
Wiring
Y57y10

Current in RB valve block piston side valve (Y57y11) too high or too low.
The fault is recognized by the evaluation of a test current pulse from N52. Wiring
Y57y11

Current in power soft top compartment cover lock "open" (Y56/2y7) too high or too low.
The fault is recognized by the evaluation of a test current pulse from N52. Wiring
Y56/2y7

Current in fabric bow lock "open" (Y56/2y6) too high or too low.
The fault is recognized by the evaluation of a test current pulse from N52. Wiring
Y56/2y6

Current in fabric bow "open" (Y56/2y3) too high or too low.
The fault is recognized by the evaluation of a test current pulse from N52. Wiring
Y56/2y3

Current in soft top bow "closed" (Y56/2y4) too high or too low The fault is recognized by the evaluation of a test current pulse from N52. Wiring
Y56/2y4

Current in soft top "closed" valve block (Y56/2y2) too high or too low
The fault is recognized by the evaluation of a test current pulse from N52. Wiring
Y56/2y2

Current in soft top "open" valve block (Y56/2y1) too high or too low The fault is recognized by the evaluation of a test current pulse from N52.
Wiring
Y56/2y1

Current in power top compartment cover "open" valve block (Y56/2y5) too high or too low
The fault is recognized by the evaluation of a test current pulse from N52. Wiring
Y56/2y5

Current in left rear power window motor (M10/5) too high or too low
Wiring
M10/5

Current in right rear power window motor (M10/6) too high or too low
Wiring
M10/6

Wiring, RB deployment solenoid (Y57/1)
23 19

The positions of the limit switches do not correspond to the function sequence or are unknown.
The status of a limit switch is not plausible. 23 17
23 18
23 8
23 9
23 10
23 11
23 12
23 13
23 14
23 15
23 16

The maximum permissible time until the roll bar (RB) retracted limit switch (S83/5) is triggered has been exceeded.
23 17

The maximum permissible time until the RB extended limit switch (S83/6) is triggered has been exceeded.
23 18

The maximum permissible time until the soft top locked (left) limit switch (S84/11) is triggered has been exceeded.
23 9

The maximum permissible time until the soft top open limit switch (S84/13s2) is triggered has been exceeded.
23 10

The maximum permissible time until the soft top close limit switch (S84/13s1) is triggered has been exceeded.
23 11

The maximum permissible time until the soft top compartment "open" limit switch (S84/5) is triggered has been exceeded.
23 12

The maximum permissible time until the cover "closed" switch (A25s1) is triggered has been exceeded.
23 13

The maximum permissible time until the cover "locked" switch (A25s2) is triggered has been exceeded.
23 14

The maximum permissible time until the soft top fabric bow down/up limit switch (S84/15), in "up" position is triggered has been exceeded.
23 15

The maximum permissible time until the soft top fabric bow down/up limit switch (S84/15), in "down" position is triggered has been exceeded.
23 15

The maximum permissible time until the soft top bow locked limit switch (S84/16) is triggered has been exceeded.
23 16

The maximum permissible time until the retractable luggage cover engaged limit switch (S69/10) is triggered has been exceeded.
23 8

1) Observe Preparation for Test, see 22.