Diagnostic Manual, Body and Accessories,
Volume 2
Diagnosis - Diagnostic Trouble Code (DTC) Memory
Preliminary work:
Function test 11
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Preparation for Test (DTC readout):
1. Fuses OK.
2. Battery voltage >11 V.
3. Unlock via RCL vehicle.
4. Ignition ON.
5. Connect Hand-Held Tester (HHT) according to connection diagram shown
in section 0.
Note:
The diagnostic trouble codes (DTC's) can only be read out and erased using
the Hand-Held Tester (HHT).
Model 129
The RCL control module (N54) 129 820 29 26 can only be read out via the
impluse counter.
Note regarding Diagnostic Trouble Codes (DTC's):
Current diagnostic trouble codes are highlighted 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
![](../../../logos/other/lceil.gif) -
Short circuit to ground (GND)
![](../../../logos/other/lceil.gif) +
Short circuit to positive (POS)
-//- Open circuit
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![](../../../volumes/ba2/4_8/12_1.gif) |
RCL control module (N54)
Diagnostic Trouble Codes
DTC
![](../../../logos/mb/mbhht.gif) |
Possible cause |
Test step/Remedy
1) |
![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/fivdg.gif) |
Red indicator lamp, ![](../../../logos/other/lceil.gif) - |
23 5.0, 9.0,
13.0 |
![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/sixdg.gif) |
Green indicator lamp, ![](../../../logos/other/lceil.gif) - |
23 6.0, 10.0,
14.0 |
![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/nindg.gif) |
Red indicator lamp, ![](../../../logos/other/lceil.gif) + |
23 5.0, 9.0,
13.0 |
![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/zerdg.gif) |
Green indicator lamp, ![](../../../logos/other/lceil.gif) + |
23 6.0, 10.0,
14.0 |
1) Observe Preparation
for Test, see 22. |
IR DAS control module (N54/1)
Diagnostic Trouble Codes
DTC
![](../../../logos/mb/mbhht.gif) |
Possible cause |
Test step/Remedy
1) |
![](../../../logos/mb/ubdg.gif) ![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/zerdg.gif) |
IR DAS control module (N54/1) |
Replace N54/1 |
![](../../../logos/mb/ubdg.gif) ![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/zerdg.gif) |
Control line deactivation, ![](../../../logos/other/lceil.gif) +
or ![](../../../logos/other/lceil.gif) - |
23 33.0 - 37.0,
39.0 |
![](../../../logos/mb/ubdg.gif) ![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/uidg.gif) |
Control line activation, ![](../../../logos/other/lceil.gif) +
or ![](../../../logos/other/lceil.gif) - |
23 32.0 - 35.0,
38.0, 39.0 |
![](../../../logos/mb/ubdg.gif) ![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/sevdg.gif) ![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/uidg.gif) |
Incorrect authorization code, motor
electronics (CAN) |
11 13.0 |
![](../../../logos/mb/ubdg.gif) ![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/sevdg.gif) ![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/twodg.gif) |
Incorrect authorization code, engine
control module, left cylinder bank, (CAN) |
11 13.0 |
![](../../../logos/mb/ubdg.gif) ![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/sevdg.gif) ![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/thrdg.gif) |
Invalid transponder code |
IR transmitter defective, replace
IR transmitter key. |
![](../../../logos/mb/ubdg.gif) ![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/sevdg.gif) ![](../../../logos/mb/zerdg.gif) ![](../../../logos/mb/foudg.gif) |
Coil for transponder (energy could
not be built up; or transponder does not respond). |
23 40.0, 41.0
Erase DTC memory,
Try another IR transmitter key. |
1) Observe Preparation
for Test, see 22. |
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